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Determination of SiO2 in lime mud by gravimetry.
- Source :
- Fresenius' Journal of Analytical Chemistry; Aug1999, Vol. 364 Issue 8, p700-704, 5p
- Publication Year :
- 1999
-
Abstract
- A simple and rapid method for the determination of SiO<subscript>2</subscript> in lime mud used in current sulfate pulping practice is reported. The lime mud samples are treated three times with 2.5 mL of 6 mol/L hydrochloric acid. The samples are nearly evaporated to dryness two times and the third time to complete dryness. To determine the exact SiO<subscript>2</subscript> content of the residue, it is treated with an excess of concentrated hydrofluoric acid and a little hydrochloric acid, and the silica is expelled as volatile silicon tetrafluoride. The sample treatments take about 1.5 h and the heating periods take a total of about 3.5 h. The SiO<subscript>2</subscript> results were evaluated by analyzing National Institute of Standards and Technology Standard Reference Materials, SRM, (1c, 694 and 88b). The method was found to be accurate and precise in a 95% confidence interval, rapid, and highly repeatable. The repeatability standard deviation for SRMs was calculated to be 0.49%. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09370633
- Volume :
- 364
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Fresenius' Journal of Analytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 49526774
- Full Text :
- https://doi.org/10.1007/s002160051417