Complexation of As(III) with different molecular weight fractions of humic acid

LI Shi-feng; ZHOU Yang; YAO Shu-hua; SHI Zhong-liang; ZANG Shu-yan

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China Environmental Science ›› 2020, Vol. 40 ›› Issue (10) : 4395-4401.

Water Pollution Control

Complexation of As(III) with different molecular weight fractions of humic acid

LI Shi-feng, ZHOU Yang, YAO Shu-hua, SHI Zhong-liang, ZANG Shu-yan

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Abstract

Humic acid (HA) was divided into five fractions with different molecular weights by ultrafiltration. The complexation behaviours and mechanism of different HA fractions with As (III) were investigated by the method of equilibrium dialysis. The conditional distribution coefficients and apparent stability constants were calculated and analysed to evaluate the complexation process. The results showed that the molecular weight of HA had significant influences on the complexation of HA with As (III). The complexing capability of HA with molecular weight less than 10kDa was better than others. The carboxyl and phenolic hydroxyl groups in HA played an important role in the complexation of HA with arsenic, and they were the main complexation sites. Based on Scatchard analysis and a two-site ligand model fitting with the complexation results, it was found that there were two types of binding sites (strong and weak) in the complexation process between different HA fractions and As (III).

Key words

arsenic / complexation / equilibrium dialysis / humic acid / molecular weight

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LI Shi-feng, ZHOU Yang, YAO Shu-hua, SHI Zhong-liang, ZANG Shu-yan. Complexation of As(III) with different molecular weight fractions of humic acid[J]. China Environmental Science. 2020, 40(10): 4395-4401

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