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22 results on '"Pang, Zijun"'

10. Anaerobic Cyanides Oxidation with Bimetallic Modulation of Biological Toxicity and Activity for Nitrite Reduction

Author

Chen, Acong, primary, Li, Haoling, additional, Wu, Haizhen, additional, Song, Zhaohui, additional, Chen, Yao, additional, Zhang, Heng, additional, Pang, Zijun, additional, Qin, Zhi, additional, Wu, Yulun, additional, Guan, Xianghong, additional, Huang, Hua, additional, Li, Zemin, additional, Qiu, Guanglei, additional, and Wei, Chaohai, additional

Published
2024
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14. Evolution of biochemical processes in coking wastewater treatment: A combined evaluation of material and energy efficiencies and secondary pollution

Author

Qin, Zhi, primary, Wei, Cong, additional, Wei, Tuo, additional, Li, Zemin, additional, Pang, Zijun, additional, Luo, Pei, additional, Feng, Chunhua, additional, Qiu, Guanglei, additional, Wei, Chaohai, additional, Wu, Haizhen, additional, Peng, Yahuan, additional, Jiang, Chengfu, additional, and Preis, Sergei, additional

Published
2022
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16. Enrichment Strategies of Heavy Metal Ions in the O/H/O Process Composed of Biological Fluidized Bed for Wastewater Treatment: A Case Study of Cu and Zn

Author

Wei, Cong, primary, Cheng, Xiaoqian, additional, Wei, Tuo, additional, Pang, Zijun, additional, Ke, Xiong, additional, Qin, Zhi, additional, Pan, Jiamin, additional, Wei, Gengrui, additional, Qiu, Guanglei, additional, Feng, Chunhua, additional, Li, Fusheng, additional, and Wei, Chaohai, additional

Published
2022
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18. Spectrophotometric determination of trace permanganate in water with N,N-diethyl-p-phenylenediamine (DPD)

Author

Zhenming Zhou, Cai Huahua, Liu Xin, Jing Zou, Qingfeng Cheng, Pang Zijun, and Baoling Yuan

Subjects
Environmental Engineering, Health, Toxicology and Mutagenesis, 0208 environmental biotechnology, 02 engineering and technology, Phenylenediamines, 010501 environmental sciences, 01 natural sciences, Absorbance, chemistry.chemical_compound, Reaction rate constant, Environmental Chemistry, Phenol, 0105 earth and related environmental sciences, Detection limit, Chemistry, Permanganate, Public Health, Environmental and Occupational Health, p-Phenylenediamine, Oxides, General Medicine, General Chemistry, Pollution, 020801 environmental engineering, Manganese Compounds, Spectrophotometry, Ultrapure water, Stoichiometry, Nuclear chemistry
Abstract

A sensitive spectrophotometric method (the N,N-diethyl-p-phenylenediamine (DPD) method) was established for the determination of trace permanganate concentration (0–10 μM) in water. The DPD method was based on the oxidative coloration reaction where permanganate could oxidize DPD to form the red colored DPD radical (DPD•+) with a second-order rate constant of 2.96 × 104 M−1 s−1 at pH 6 (50 mM phosphate buffer). The generated DPD•+ could be quantitatively measured at 551 nm using an UV–Vis spectrophotometer. There was a good linear relationship (R2 = 0.999) between the absorbance of DPD•+ and permanganate concentration. The DPD method was highly sensitive, and the absorbance of generated DPD•+ at 551 nm was as high as 5.70 × 104 cm−1 per M (mol L−1) of permanganate. The reaction of permanganate with DPD in the pH range of 4.0–8.0 had a stoichiometric coefficient of 1:2.71. The residual absorbance of DPD•+ in ultrapure water and natural waters was fairly stable for 30 min. Limits of detection of the proposed DPD method in ultrapure water and natural waters were calculated to be as low as 0.010 μM and 0.017 μM, respectively. Moreover, trace permanganate concentrations of 0.04 and 0.10 μM were found in natural waters and wastewater by the proposed DPD method. Additionally, the DPD method could be applied to measure the second-order rate constants of the reaction of permanganate with phenol at pH 7.0 (28.2 M−1 s−1).

Published
2018

22. A spectrophotometric method for measuring permanganate index (COD Mn ) by N,N-diethyl-p-phenylenediamine (DPD).

Author

Pang Z, Cai Y, Xiong W, Xiao J, and Zou J

Subjects
Oxidation-Reduction, Phenylenediamines, Potassium Permanganate, Spectrophotometry, Manganese Compounds, Oxides
Abstract

A new spectrophotometric method for measuring permanganate index (chemical oxygen demand using potassium permanganate (KMnO 4 ) as oxidant, COD Mn ) in water was established. The method was based on the rapid oxidation of N,N-diethyl-p-phenylenediamine (DPD) by residual KMnO 4 in digestion solution under neutral pH condition to form the stable pink radical (DPD ●+ ). Only 20 s were enough to form the pink DPD ●+ . The generated DPD ●+ could be quantitatively measured by a visible spectrophotometer at 551 nm. Stoichiometric coefficient of the reaction between KMnO 4 and DPD was close to 1:5 (1:5.07). There was a well linear relationship (R 2  = 0.999) between the change of the absorbance of DPD ●+ at 551 nm and the concentration of COD Mn in the range of 0-4.46 mg L -1 . Limit of detection of the DPD method was as low as 0.02 mg L -1 COD Mn . The DPD method was highly accurate for measuring COD Mn in standard solutions with well recovery rates of 99.17%-102.22%, and was well tolerant to the interference of coexistent Cl - and Fe 3+ . The DPD method was successfully applied for measuring COD Mn in real water samples, including surface water, underground water and drinking water. In comparison to the traditional titration method, the proposed DPD method was more convenient to operate, required less samples and digestion reagents (i.e., KMnO 4 and H 2 SO 4 ) and could be employed for online monitor., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier Ltd. All rights reserved.)

Published
2021
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