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Department of Physics and Chemistry, B. S. College, Basmathnagar-431 512, Maharashtra, India E-mail : pggawali_l23@rediffmail.com Manuscript received 10 January 2011. accepted 21 December 2011 Values of dielectric constant (£') and loss factor (£") have been experimentally determined for binary liquid mixtures of n-decanol + ethanolamine at 6. 7 GHz microwave frequencies at 39 ºc. The values of £' and £" have been used to evaluate the molar polarization, apparent polarization and the excess activation energy, viscosity and viscous now have also been calculated. These parameters have been used to explain the formation of 2 : 1 complexes for the system (n-decanol + ethanolamine).

Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University. Aurangabad-431 004, Maharashtra, India E-mail : abr_chem@yahoo.co.in Manuscript received 26 March 2009, accepted 3 July 2009 Densities and viscosities of the binary mixtures of 1,2-ethanediol with primary alcohols such as methanol, ethanol, 1-propanol and 1-butanol were measured at 293.15, 303.15 and 313.15 K and refractive index for same systems were measured at 303.15 K over the entire composition range. This experimental data were used to calculate excess molar volumes (VE), viscosity deviations (∆η) and refractive index deviations (∆nD). These results were fitted to RedlichKister polynomial equation and results have been discussed in terms of molecular interaction and structural effects. The excess properties were found to be either positive or negative depending on the molecular interaction and the nature of liquid mixtures. &nbsp

Department of Chemistry, Agra College, Agra-282 002, Uttar Pradesh, India E-mail : mukhtarsingh2003@rediffmail.com Manuscript received 18 November 2008, revised 22 June 2009, accepted 26 June 2009 Densities and viscosities of binary liquid mixtures of ethylenediamine with polar and non-polar solvents, viz. methyl alcohol, ethyl alcohol, n-propyl alcohol, n-butyl alcohol, acetone, methyl ethyl ketone, carbon tetrachloride, benzene and toluene have been measured at 293.15, 303.15 and 313.15 K. From density and viscosity data the values of viscosity deviations (0.11) and the thermodynamic excess properties viz. the excess molar volume (VE) and the excess Gibbs free energy of activation of viscous flow (∆G#E) have been determined. The values of ∆η, VEand ∆G#E have been fitted to Redlich-Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and theoretical (calculated) values. From the small magnitude of the values of standard deviation it is concluded that the experimental values of ∆η, VEand ∆G#E compare fairly well with the theoretical values predicted by Redlich-Kister equation. The effect of increasing temperature on the values of ∆η, VEand ∆G#E as well as the nature of molecular interactions between the mixing components of the binaries has also been discussed.

Department of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India E-mail : drsoni_nk@rediffmail.com Department of Chemistry, Kamala Nehru Institute of Science (Awadh University, Faizabad), Sultanpur-228 118, Uttar Pradesh, India Manuscript received 10 May 2007, revised 8 October 2007, accepted 28 May 2008 Corresponding-states group-contributions method (CSGC), for the first time, has been extended to estimate surface tension of five binary liquid mixtures namely, 1,4-dioxane + hexane, 1,4-dioxane + heptane, 1,4-dioxane + octane, 1,4-dioxane + nonane, 1,4-dioxane + decane. Computed values of the employed method are compared with the experimental findings. The agreement between experimental and theoretical values is found to be satisfactory.

Department of Chemistry, Kurukshetra University, Kurukshe....t ra-136 119, Haryana, India E-mail : palchem@sify.com Fax: 91-1744-238277 Manuscript received 10 January 2007, revised 7 May 2007, accepted 7 May 2007 The excess molar volume (VEm), ultrasonic speed (u), and dynamic viscosity (ɳ) have been measured in dipropylene glycol dimethyl ether + butylamine, dibutylamine, and tributylamine across their entire composition ranges at 298.15 K and atmospheric pressure. The density values derived from the excess molar volumes were converted to molar volumes (V) which are combined with the speed of sound to obtainu estimates of the product Ks,mand their excess counterparts KES,m• In all mixtures the excess molar volumes are negative and symmetric across the entire composition range. The KEsm, values are positive for all mixtures. The deviation of the speeds of sound uD from their ideal values uid in an ideal mixture were also calculated for all measured mole fractions. Viscosities have also been measured for mixtures of dipropylene glycol dimethyl ether and butylamine, dibutylamine, or tributylamine at the same temperature. From the experimental data, the deviation in the viscosity ɳ from ∑xiIn ɳand excess energies of activation for viscous flow (.∆G*E) have been derived for all systems. The Flory theory of mixtures provides a useful basis for a quantitative interpretation of the viscosity results. The theoretical values of molar isentropic compressibility (Ks,m)and of speed of sound (u) have been estimated using the Prigogine- lory-Patterson {PFP) theory with the van der Waals (vdW) potential energy model and the results have been compared with experimental values.

Department of Chemistry, Agra College, Agra-282 002, Uttar Pradesh, India E-mail : mukhtarsingh2003@rediffmail. com Mnuscript received 29 May 2006, accepted 7 November 2006 Densities and viscosities of binary and ternary mixtures of o-nitrotoluene with methyl alcohol, benzene, toluene, carbon tetrachloride and 1,4-dioxane have been determined at 298.15 K over the whole composition range. From density and viscosity data, viscosity deviations (Δη) and excess thermodynamic functions, viz. the molar ''volume(VE) and the excess Gibbs free energy of activation of viscous flow (ΔG#E) have been calculated in respect of binary and ternary liquid mixtures at 298.15 K and fitted by Redlich-Kister and Cibulka equations respectively. From the small magnitude of the values of standard deviation it is concluded that the experimental values of Δη,VEand ΔG#Ecompare fairly well with the corresponding theoretical values predicted by Redlich-Kister and Cibulka equations for binaryand ternary mixtures respectively.

E-mail : mahendraroy2002@yahoo.co.in Manuscript received 6 March 2006, revised 11 August 2006, accepted 16 October 2006 Densities and viscosities of the binary mixtures of N,N-dimethylformamide (DMF) with 1-butanol, 2-methyl-1-propanol, 2-butanol and 2-methyl-2-propanol were measured at 298.15, 308.15 and 31S.l5 Kover the entire composition range. The composition-dependence of densities and viscosities was checked by using an empirical relation. The experimental data were used to calculate excess molar volumes (VE:) and deviations in viscosity (∆ᶯ). These results were fitted to Redlich-Kister polynomial equation. The density and viscosity data have been analyzed in terms of some semiempirical viscosity models and the results have been discussed in terms of molecular interactions and structural effects. The excess properties were found to be either negative or positive depending on the molecular interactions and the nature of liquid mixtures.

Department of Chemistry, St. Joseph's College, Darjeeling-734 104, India Department of Chemistry, North Bengal University, Darjeeling-734 430, India E-mail : dkhazra@rediffmail.com Fax : 91-353-2581546 Manuscript received 16 August 2004 Densities, viscosities and ultrasonic velocities of the binary mixtures of N,N-dimethylacetamide + 2-methoxyethanol and + water have been measured at temperatures 298.15 ≤ T/K ≤ 318.15. The excess molar volumes, viscosity deviations and isentropic compressibility changes of the mixtures from the ideal mole fraction rule have been calculated from these data. The computed results have been fitted to the Redlich-Kister polynomial. The results have been interpreted in terms of structural effects of the solvents.

Department of Chemistry, University of North Bengal, Darjeeling-734 430, India E-mail : mahendraroy2002@yahoo.co.in Fax: 91-0353-2581546 Manuscript received 12 May 2003, revised 26 September 2003,accepted 16 October 2003 Density and viscosity of pure benzene and its binary mixtures with carbontetrachloride and chloroform have been measured as a function of composition over the entire range at 298, 308 and 318 K. The excess volume, excess viscosity, excess free energy of activation of viscous flow and interaction parameter of Grunberg and Nissan have been calculated from the experimental data as a function of composition. All the excess functions are found to be either negative or positive over the entire range of composition depending on the molecular interactions and the nature of liquid mixtures. These properties are discussed in terms of nature of the molecular interactions between the component molecules.

Department of Chemistry, North Bengal University, Darjeeling-734 430, India Fax: 91-0353-2581546 Manuscript received 1 October 2002 Densities and viscosities of the binary mixtures of N,N-dimethylacetamide with formam ide and N,N-dimethylformamide have been measured at 298.15, 308.15 and 318.15 K. The excess molar volumes ( VE) and the viscosity deviations (Δŋ) of the mixture from the ideal mole fraction rule have been calculated from these data. The values of both VE and Δŋ have been discussed in terms of intermolecular interactions between the mixing components of the binary mixture. The computed results have been fitted to the Redlich-Kister polynomial relation to estimate the regression coefficients and standard errors for these systems.

Environmental Analytical Chemistry Laboratory, Department of Chemistry. Shivaji University, Kolhapur-416 004, India Manuscript received26 July 2000. revised 16 July 2001. accepted 15 September2001 A separation method has been developed for trace level iron(III) using dibenzo-18-crown-6 from HCI medium. lron(lll) has been separated from a number of metal ions in binary mixtures. Most of the cations and anionsshow high tolerance limits. The method permits the separation of (III) from iron(II) and other cations.

Department of Chemistry, Kalyani University, Kalyani-741 235, India Manuscript received 13 August 2001 The solubilities and dissociation constants of salicylic acid in isopropanol (2-propanol) + water and t-butanol (2-methyl-2- propanol) + water mixtures have been deter·mined. The changes in Gibbs energies of transfer of neutral salicylic acid are coupled with the changes in Gibbs energies of transfer for the dissociation processes to determine the Gibbs energy changes of transfer forsalicylate ion from water to aquo-organic solvents. Δ\(G_t^o\) (HSal-) is positive and passes through minima at ~34 mass% of isopropanol and ~25 and 65 mass% of t-butanol. The results arc interpreted in terms of ion-solvent interactions and the characteristic changes in the solvent properties in these regions. In order to comprehend the ion-solvent interactions in a better way, attempts have been made to calculate the inter·action energies of benzoic acid, benzoate ion, salicylic acid and salicylate ion utilizing the scaled particle theory and the data obtained from the present work and the previous works. The Gibbs energy changes due to interaction for neutral acid, Δ\(G_{t(int)}^o\) [water → org. solv.]are negative and favor·able but Δ\(G_{t(int)}^o\) due to OH group is increasingly positive indicating that OH group in the ortlro-position hinders dissolution process. The Δ\(G_{t(int)}^o\) (BZ-) and Δ\(G_{t(int)}^o\) (HSal-)are positive and Δ\(G_{t(int)}^o\) (BZ-) > Δ\(G_{t(int)}^o\) (HSal-). The Δ\(G_{t(int)}^o\) due to OH group in the anion is seen to be increasingly negative which can be correlated with the fact that the salicylate ion is stabilized due to hydrogen bonding leading to an increased dissociation of salicylic acid. The behavior of OH group in case of neutral acid and charged anions have been found to he exactly opposite.

P. G. Department of Physical Chemistry, M. S. G. College, Malegaon Camp-423 105, India E-mail : absawant@zeenext.com Z. P. Girl's Junior College, Malegaon-423 203, India Manuscript received 12 May 2000, revised 14 September 2000, accepted 12 February 2001 From density and viscosity values of binary mixtures of aniline with pentan-1-ol, hexan-1-ol, heptan-1-ol, octan-1-ol and decan­I-ol, measured at 298.15, 303.15, 308.15 and 313.15 K, excess molar volumes (VE) and deviations in viscosity (∆ In η ) have been calculated. All mixtures show negative VE values in a narrow region corresponding to low concentration of aniline and positive VE values in a wide region corresponding to high concentration of aniline at all temperatures. ∆ In η values for all mixtures are negative over the whole composition range at all temperatures.

Environmental Analytical Chemistry Laboratory, Department of Chemistry, Shivaji University, Kolhapur-416 004, India Manuscript received 13 September 1999, revised 14 February 2000, accepted 28 April 2000 A simple extractive separation method for trace level of barium (2.5-25 ppm) has been developed using dibenzo-24-crown-8 from picric acid medium. Barium is quantitatively extracted from 0.008-0.05 M picric acid with 0.0008-0.01 M dibenzo-24-crown-8 in nitrobenzene as a diluent. From the organic phase barium is quantitatively stripped with 1-10 M HNO3 and HCIO4, 1-8 M HBr, 0.1-2.0 M HCI. Separation of barium has been carried out from a number of binary and multicomponent mixtures. The method is extended for the determination of barium in various rock samples.

Department of Chemistry, Fakir Chand College, Diamond Harbour-743 331, 24-Parganas (S), India Department of Chemistry. University of Kalyani, Kalyani-741 235, India Manuscript received 17 June 1999, revised 15 February 2000, accepted 13 June 2000 In order to understand the differential behaviour of the solvents on the stability of the molecular complexes, the association constantsbetween chloranil and benzoic acid, salicylic acid have been determined in C6H6 + n-C6H14 mixtures (0-100%). The values changemarginally with solvent composition and no positive correlation could be made.

Department of Chemistry, Visva-Bharati, Santiniketan-731 235, India Manuscript received 12 March 1998, revised 16 December 1998, accepted 4 February 1999 A selective method has been developed for extraction chromatographic studies of PdII with SRS-100 {liquid cation exchanger) coated on silica gel as stationary phase. Quantitative extraction of PdII has been achieved from acetate buffer solution across the pH range 6.0-6.5. The effect of pH, stripping agents, flow rate on extraction and elution have been investigated. Exchange capacity of the exchanger at different temperatures with respect to PdII have been determined. PdII has been separated from various. elements as well as from several synthetic multicomponent mixtures.

Department of Chemistry, Visva-Bharati, Santiniketan-731 235 Manuscript received 1 August 1996. revised 12 May 1997, accepted 16 July 1997 A selective method has been developed for the extraction chromatographic studies of TIIII with high molecular weight carboxylic acid, SRS-100 (a liquid cation exchanger) as a stationary phase on a column of silica gel. Quantitative extraction of Tim has been achieved in the pH range 5.0-6.0 from acetic acid and sodium acetate solution. The effects of variable as pH, stripping agents, flow rate on extraction and elution have been studied. The exchange capacity of the exchanger has been determined. TIIII has been separated from several metal ions.

Applied Chemistry Department, Faculty of Technology and Engineering, M S. University of Baroda, Baroda-390 001 Manuscript received 18 March /996, revised 4 November 1996, accepted 8 November 1996 Mesomorphic Characteristics of Binary Mixtures of Structurally Dissimiliar Mesogens.

Department of Chemistry, North Bengal University, Darjeeling-734 430 Manuscript received 15 December 1995, revised 12 June 1996, accepted 2 September 1996 Organophilic Characteristics of Organic Derivatives of Bentonite, Kaolinite, Alumina and their Binary Mixtures.

Department of Chemistry, Jadavpur University, Calcutta-700 032 Manuscript received 3 August 1994. revised 6 March 1995, accepted 27 March 1995 The determination of the components of the mixture containing an organic acid quantitatively oxidisable by vanadium(v) in perchloric acid and another organic acid which may or may not be so oxidised by the oxidant, has been described. The standardised solution of Na(or NH4)VO3 in dilute HCIO4 has been used to determine components of the binary mixtures prepared either by combining one non-reducing acid (category A) with a reducing acid (category B) or by combining two acids of category B. The former mixtures gave better results. The standardisation of vanadium(v) solution was effected by standard solutions of one or both of the components of the mixtures.

Department of Chemistry, Visva-Bharati, Sanuniketan-731 235 Manuscript received 27 January 1994, revised 27 May 1994, accepted 23 August 1994 A selective method has been developed for reversed phase extraction chromatographic studies of zirconium(IV) with high molecular weight carboxylic acid, n-capric acid as a stationary phase on a column of silica gel . Quantitative extraction of zirconium(IV) has been achieved from 0.01 M acetic acid solution in the pH range 2.5-5.0. The extracted zirconium(lV) has been stripped with nitric acid (4 M) and estimated spectrophotometrically. The effect of variables as pH, stripping agents, flow rate on extraction and elution have been studied. Exchange capacity of the exchanger and breakthrough capacity have been determined. Zirconium(IV) has been separated fromvarious elements. Zirconium(IV) has also been separated from several synthetic multicomponent mixtures.

Department of Pure Chemistry, Science College, Calcutta University, 92 Acharya Prafulla Chandra Road, Calcutta-700 009 Department of Chemistry, Jadavpur University, Calcutta-700 032 Manuscript received 6 January 1993, revised 22 February 1993, accepted 4 May 1993 Extractive Method of Separation of Cadmium(II) as Ethylxanthate from a Number of Ions in Solutions of Binary Mixtures. &nbsp

Department of Chemistry, Visva-Bharati, Santiniketan-731 235 Manuscript received 11 March 1991, revised 24 June 1992, accepted 3 July 1992 Cerium(Iv) was extracted at pH 4.75-6.0 from ammonium acetate-acetic acid buffer on silica gel column impregnated with n-capric acid (a high molecular weight carboxylic acid). It was separated from bivaleat Mg, Mn, Co, Ni, Zn and Cd in binary mixture at pH 5.1 as they could not form acetate complex. Cerium(IV) was separated by process of selective elution from elements like FellI, ZrIV, PdII, LaIII, PrIII, NdIII, SmIII, GdIII, DyIII, Hgll, Pbll, ThIV and UVI by exploiting differences in stability of acetate complexes. Cerium(Iv) was separated from multicomponent mixture containing ZnII, ZrIV, Pbll, ThIV, UVI and rare earth elements by a process of selective sorbtion and selective elution. The proposed method is simple, rapid and selective.

Department of Chemistry, University of Burdwan, Burdwan-713 104 Manuscript received 20 June 1991, revised 3 December 1991, accepted 22 January 1992 In continuation of our work 1,2 with insoluble tungstates, presently we have synthesised a granular variety of thorium tungstate (TT) suitable for column operation, prepared for the first time by Turnov and Kovba3. The preparation, properties and ions exchange behaviour of crystalline variety of TT have also been studied by Qureshi and Nabi4 and De and Chowdhury5.The present work describes the exchange capacities and distribution coefficients of several cations on the granular variety of TT and useful separation of some binary mixtures of cations.

Chemistry and Biochemistry Department, Haryana Agricultural University, Hisar-125 004 Manuscript received 12 April 1991, accepted 27 November 1991 Ia order to understand the intermolecular interaction of aromatic hydrocarbons with other non-electrolyte solvents having molecules of different shapes and sizes, excess molar enthalpies (HE) of binary systems, namely, o-xylene + cyclohexane, p-xylene+cyclohexane and benzene+n-octane, have been determined at 300.05 K using an isothermal phase change calorimeter. The observed excess enthalples have been interpreted in terms of the intermolecular interactions within the mixture. The experimental HE data has been compared with the corresponding values obtained from Flory•s theory for binary mixtures. For the studied systems, the contact interactions contribution to HE Is found to predominate the equation of state contribution

Applied Chemistry Department Applied Physics Department, Faculty of Technology and Engineering, M. S. University of Baroda, Baroda-390 001 Manuscript received17 June 1991, accepted 21 August 1991 Two homologous series of mesogens viz p-chlorophenyl p'-n-alkoxycinna-mates1 (I) and p-nitrophenyl p'-n-alkoxycinnamates' (II) have been synthesised. Three binary systems of the homologues of these series have been explored here The first two binary systems consist of homologues of series (1) ; binary system 1 consisting the homologues p-chlorophenyl p'-n-hexyloxycinnamate K 87° S 118° N 124° IA and p-chlorophen)I p'-n-decyloxycinnamate, K 78° S 123° IB and binary system 2 consisting the homologues p-chlorophenyl p'-ethoxycinnamate K 135° IA and p-chlorophenyl, p'-n-butoxycinnamate K 98.5° S 108° N 122° IS. The binary system 3 consists of homologues of series'', II, viz. p-nitrophenyi p'-ethoxycinnamate K 168° IA and p-nitrophenyl to-n butoxycinnamate K 116° N 120.5° IB In binary system 1, the overall mixed smectic characteristic predominates over a wide range of temperature and concentration The mixed nematic phase does not extend beyond above 30 mole% of the smectic mesogen (B). The N-Iand S-I curves deviate very little from the rule of linearity. Contrary to which the binary system 2 indicates predominance of the mixed nematic character, the N-1 curve follows an ideal pattern The S-N curve shows the steep rising tendency as the concentration of the nematogen (B) increases similar to one found in the case of pure homologous series exihibiting polymesomorpbism1,2. The binary system 3 presents similarity with other binary systems studied2, the characteristic effects due to the magnitude of the dipole moments of the NO2 group are discernible. The N-I curve deviates from the rule of linearity though the components comprising the system are identical in all respects in their molecular geometry.&nbsp

Department of Chemistry, Visva-Bharati, Santiniketan-731 235 Manuscript received 10 April 1990, revised 4 March 1991, accepted 27 May 1991 A selective method has been developed for reversed phase extraction chromatographic studies of zireonium(IV) with high molecular weight carboxylic acid, Versatic 10, as a stationary phase on a column of silica gel. Quantitative extraction of zirconium has been achieved from acetic acid solution across the pH range 1,5- 4.8. The effect of variables such as pH, stripping agents and flow rate on extraction and elution have been studied. Exchange capacity of the exchanger has been determined at different temperatures. Zirconium has been separated from a variety of elements.

Chemistry Department, Lucknow University, Lucknow Manuscript received 11 August 1911 ; revised 28 November 1974; accepted 29 April 1975 Solubilization of fats and oils in water has been studied by specific conductivity, transmission calorimetric and phase rule medicinal measurements at 40° and it is observed that solubilized solution (mustared oil + water) are not permanently thermodynamically stable even in presence of detergents and soaps and hence unsuitable for industrial, medicinal use due to toxitological effect.

Department of Chemistry, Andhra University, Waltair-530 003, (India) Manuscript received 21 June 1977, revised 7 January 1978, accepted 17 May 1978 The rt:action between Iron(ll) and cerium(IV) sulphate in phosphoric acid medium (6-12M) is studied potentiometrically and visually using methylene blue, thionine, azure A, azure B, azure C, toluidine blue, new methylene blue, variamine blue, ferroin, p-ethoxy- chrysoidine, N-pheoylanthraoilic acid and barium diphenylamine sulphonate as indicators. This reaction is made use for the analysis of binary mixtures of Fe(II)Sn(II), Fe(II)-Ti(II), Fe(II)-U(IV), Fe(II)-Mo(V), Fe(II)-Fe(lll) with Ce(IV) sulphate and Ce(IV)-U(VI), Ce(IV)-Mo(VI), Ce(IV)-V(V) and Ce(IV).Cu(ll) with iron(II).

Department of Chemistry, Indian Institute of Technology, Bombay-400 076 Manuscript received 2 December 1986, revised 3 August 1987, accepted 22 April 1988 A novel method was developed for extraction chromatographic separation of zinc with tributyl phosphate as the stationary phase. Zinc was extracted from 1 M ammonium thiocyanate and was stripped with 0.25 M ammonium chloride. In addition, all mineral acids of appropriate strength and ammonium acetate (2 M) were also effective as stripping agents. Zinc was separated from a variety of elements in binary and muiticomponent mixtures by exploiting the difference in their extractability or stripping characteristics by different media. The method was extended for the analysis of zinc in soil and effiuent samples.

Department of Chemistry, Vlsva-Bharati, Santiniketan-731 235 Manuscriptreceived 8 February 1988, revised 19 May 1988,accepted 17 August 1988 A rapid and selective method for the extraction of lron(III) with reversed phase extraction chromatographic technique on silica gel Impregnated with high molecularweight carboxylic acid (SRS-100) has been reported. Quantitative extraction is achieved In the pH range 2.8- 3.5 from acetic acid and sodium acetate solution. Effects of variables such u pH, eluting agents. and flow rate on extraction and elution have been studied. Exchange capacity of the prepared exchanger has been determined by the usual process. Iron(III) hasbeen separated from several metal ions. Inorder to assess the possible analytical application,lrou(III) has been separated from several multicomponent mixtures contaioing metal ionscommonly associated ft. Attempts have been made to extract lron(III) from standard alloy and ore samples.

Chemistry Department, Lucknow University, Lucknow, U. P. India Manuscript received 11 January 1978 ; accepted 3 March 1978 Excess Volumes of Mixing of Some Electron Donating Hydrocarbons with an Electron Accepting Liquid Chlorobenzene.

Department of Chemistry, Indian Institute of Technology,Bombay-400 076 Manuscript received 20 September 1985, revised 8 April 1986, accepted 23 April 1986 Cation Exchange Chromatographic Separation of Nickel in Mixed Solvents.

Department of Chemistry, University of Calicut, Kerala.-6'18 685 Manuscript received 4 August 1917, revised 11 January 1918, accepted 10 April 1918 Systematic studies on the anion-exchange behaviour of Bi(III) in maleic acid and succinic acid solutioos on Amberlite IRA-401 are carried out. Sulphuric. nitric and perchlorie acids at different concentrations were tried as eluants in the two systems. Their efficiency being evaluated in terms of distribution coefficients. Methods have been developed for the separation of Bi(III) from several elements in maleate as well as in succinate media with the technique of selective sorption or selective elution. Methods are applied to the analysis of Wood's metal. Separations are also worked out with liquid anion-exchanger, Ambertile LA-I in xylene.

Department of Chemistry, AnnamalaiUniversity, Annamalainagar Manuscript received 17 March 1977, revised 16 April 1977, accepted S May 1977 Molecular Interactions --Studies on the Distribution of Aniline between Water and Binary Mixtures of Organic Solvents.

Chemistry Department, University of Lucknow, Lucknow, (India.) Manuscript received 29 November 1977, revised 6 February 1978, accepted 28 March 1978 Viscosities of some polar and non-polar liquids in admixture with DMSO have been measured at 30° and 40° and the results have been examined in the light of the relations developed for binary mixtures. The value of the interaction energy 'W' is calculated for each of the mixture at 30°.

Separation of Thallium(l), Mercury(II), Silver(I), and Copper(II) by Ion-exchange Chromatography.

The new constants KT and RT have been applied in thirteen binary mixtures in cyclohexane and the results compared with the Lorentz-Lorenz function RL and the Gladstone-Dale function RG - Both the constants Kr and RT offer better agreement than RL and RG.

Effect of Temperature on Selective Adsorption by Silica Gel from Binary Mixtures.

Application of mixture law to rheochor in binary system of solid-liquid and in ternary system has been investigated.

Department of Chemistry, Ravenshaw College, Cuttack Manuscript received 4 May 1971, revised manuscript received 28 August 1971; accepted for publication 9 February 1972 Paper chromatographic separation of isomeric mono aryl thioureas like p-carboxy phenyl thiourea from o-carboxy phenyl thiourea and o-carboxy phenyl thiourea from m-carboxy phenyl thiourea, isomeric sym-diaryl thioureas like sym-di (-o-carboxy phenyl thiourea, isomeric thiazoles like 4-phenyl-2-o-carboxy phenyl amino thiazole from 4 phenyl 2-p-carboxy phenylamino thiazole and 4 methyl 2-o-carboxy phenyl amino thiazole from 4-methyl 2-p-carboxy phenyl amino thiazole; isomeric thiazolines like 4-phenyl 2-o-carboxy phenyl imino-3-o-carboxy phenyl Δ4-thiazoline from 4-phenyl 2-p-carboxy phenyl imino-3-\({p}\)-carboxy phenyl Δ4-thiazoline and 4-methyl-2-p-chlorophenyl imino 3-p-chlorophenyl Δ4-thiazoline from 4-methyl-2-m- chlorophenyl imino-3-m-chlorophenyl Δ4-thiazoline has been effected successfully in various solvent systems.