Photodegradation of microcystin-LR (MC-LR) by fulvic acid (FA) and effect of environmental factors

WANG Yanzhao, ZHANG Jingjing, ZHANG Dajuan, DAI Wei, BI Xiangdong

Journal of Dalian Fisheries University ›› 2024, Vol. 39 ›› Issue (2) : 281-288.

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Journal of Dalian Fisheries University ›› 2024, Vol. 39 ›› Issue (2) : 281-288. DOI: 10.16535/j.cnki.dlhyxb.2023-220

Photodegradation of microcystin-LR (MC-LR) by fulvic acid (FA) and effect of environmental factors

  • WANG Yanzhao,ZHANG Jingjing,ZHANG Dajuan,DAI Wei,BI Xiangdong*
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Abstract

To investigate the photodegradation of microcystin-LR (MC-LR) by dissolved organic matter (DOM) in natural aquatic environments, the photolysis patterns and products of MC-LR in the main photosensitizer of DOM fulvic acid (FA) solutions with different concentrations of 2.5, 5.0, 7.5 and 10.0 mg/L were compared under simulated solar irradiation, and the effects of different pH values and light intensities on FA photodegradation of MC-LR were investigated. The results showed that the direct photolysis of MC-LR was found in deionized water. Different concentrations of FA led to promote the photolysis of MC-LR, with the best photodegradation at 7.5 mg/L of FA. There was degradation rate of 52.65% in 180 min. The photodegradation of MC-LR by FA was shown to be conformed to the second-order reaction kinetics, with the same photodegradation products as the direct photolysis products in deionized water. The descending order of photodegradation effects of FA on MC-LR were described as pH 6 >pH 7 >pH 8 >pH 9 and 39.8 μmol/(s·m2)> 56.9 μmol/(s·m2)> 22.8 μmol/(s·m2), indicating that both pH value and light intensity affected the photodegradation of FA on MC-LR. The best promoting effect of FA on the MC-LR photodegradation was observed at pH 6 and light intensity of 39.8 μmol/(s·m2).

Key words

fulvic acid(FA) / MC-LR / photodegradation / dissolved organic matter (DOM)

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WANG Yanzhao, ZHANG Jingjing, ZHANG Dajuan, DAI Wei, BI Xiangdong. Photodegradation of microcystin-LR (MC-LR) by fulvic acid (FA) and effect of environmental factors[J]. Journal of Dalian Fisheries University, 2024, 39(2): 281-288 https://doi.org/10.16535/j.cnki.dlhyxb.2023-220
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