SHIELDING EFFECT OF ZINC SULFATE ON CYANIDE COMPLEX DURING THIOCYANIDE DETECTION FOR COKING WASTEWATER

CHEN Acong; WEI Tuo; QIN Zhi; CHEN Yao; XU Rui; WU Haizhen; WEI Chaohai

doi:10.13205/j.hjgc.202305018

Volume 41 Issue 5

May 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(5): 134-139

CHEN Acong, WEI Tuo, QIN Zhi, CHEN Yao, XU Rui, WU Haizhen, WEI Chaohai. SHIELDING EFFECT OF ZINC SULFATE ON CYANIDE COMPLEX DURING THIOCYANIDE DETECTION FOR COKING WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 134-139. doi: 10.13205/j.hjgc.202305018

Citation:

CHEN Acong, WEI Tuo, QIN Zhi, CHEN Yao, XU Rui, WU Haizhen, WEI Chaohai. SHIELDING EFFECT OF ZINC SULFATE ON CYANIDE COMPLEX DURING THIOCYANIDE DETECTION FOR COKING WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 134-139. doi: 10.13205/j.hjgc.202305018

Citation:

CHEN Acong, WEI Tuo, QIN Zhi, CHEN Yao, XU Rui, WU Haizhen, WEI Chaohai. SHIELDING EFFECT OF ZINC SULFATE ON CYANIDE COMPLEX DURING THIOCYANIDE DETECTION FOR COKING WASTEWATER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 134-139. doi: 10.13205/j.hjgc.202305018

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SHIELDING EFFECT OF ZINC SULFATE ON CYANIDE COMPLEX DURING THIOCYANIDE DETECTION FOR COKING WASTEWATER

doi: 10.13205/j.hjgc.202305018

1. School of Environment and Energy, South China University and Technology, Guangzhou 510006, China;
2. School of Biology and Biological Engineering, South China University and Technology, Guangzhou 510006, China

Received Date: 2022-08-31

Abstract

Abstract

Coking wastewater contains a large amount of cyanide (CN^-) and thiocyanide (SCN^-) and other toxic and harmful pollutants. In the pretreatment process prior to the biological process, generally, ferrous sulfate (FeSO₄) was used to coagulate and precipitate sulfide, oil, and suspended matter to reduce the toxicity of wastewater. At the same time, ferrocyanide ([Fe(CN)₆]^4-) was formed, and then [Fe(CN)₆]^4- was combined with Fe³⁺ to form iron ferrocyanide precipitation (Prussian blue, Fe₄[Fe(CN)₆]₃), which interfered with the accuracy of ferric thiocyanate [Fe(SCN)₃] spectrophotometric method for SCN^- detection. To solve the above problems, it was proposed that zinc sulfate (ZnSO₄) should be added to shield excessive [Fe(CN)₆]^4- before Fe(SCN)₃ color development; moreover, the influence of ZnSO₄ on the analysis and detection of SCN^- was analyzed. The results showed that the Fe(SCN)₃-ZnSO₄ spectrophotometry could shield the interference of [Fe(CN)₆]^4- and most metal cyanide complexes in industrial wastewater, so that SCN^- can be determined quickly and accurately. The applicable concentration range of this method was 0.2~34.8 mg/L of SCN^-, the statistical variance was 1.86%, and the recovery rate was 94%~103%. This method is suitable for multi-point and multi-frequency sampling analysis, and is a novel method for the site monitoring of SCN^- in industrial wastewater.
- coking wastewater,
- thiocyanate,
- cyanide,
- Prussian blue,
- zinc sulfate,
- shielding effect

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References(29)

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