Chemical speciation determines combined cytotoxicity: Examples of biochar and arsenic/chromium

被引:14
|
作者
Liu, Jian [1 ]
Wen, Yuting [1 ]
Mo, Yucong [1 ]
Liu, Weizhen [2 ]
Yan, Xiliang [1 ]
Zhou, Hongyu [1 ]
Yan, Bing [1 ]
机构
[1] Guangzhou Univ, Inst Environm Res Greater Bay Area, Key Lab Water Qual & Conservat Pearl River Delta, Minist Educ, Guangzhou 510006, Peoples R China
[2] South China Univ Technol, Sch Environm & Energy, Guangdong Prov Key Lab Solid Wastes Pollut Control, Guangzhou 510006, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
Biochar (BC); Arsenic (As); Chromium (Cr); Combined cytotoxicity; Valence states; HEXAVALENT CHROMIUM; AQUEOUS-SOLUTION; AS(III) REMOVAL; ELECTRON-DONOR; CR(VI); CR(III); WATER; REDUCTION; IMMOBILIZATION; TRANSFORMATION;
D O I
10.1016/j.jhazmat.2023.130855
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
As both electron donors and acceptors, biochars (BCs) may interact with multivalent metal ions in the environment, causing changes in ionic valence states and resulting in unknown combined toxicity. Therefore, we systematically investigated the interaction between BCs and Cr (Cr(III) & Cr(VI)) or As (As(III) & As(V)) and their combined cyto-toxicity in human colorectal mucosal (FHC) cells. Our results suggest that the redox-induced valence state change is a critical factor in the combined cytotoxicity of BCs with Cr/As. Specifically, when Cr(VI) was adsorbed on BCs, 86.4 % of Cr(VI) was reduced to Cr(III). In contrast, As(III) was partially oxidized to As(V) with a ratio of 37.2 %, thus reaching a reaction equilibrium. Meanwhile, only As(V) was released in the cell, which could cause more As(III) to be oxidized. As both Cr(III) and As(V) are less toxic than their corresponding counterparts Cr(VI) and As(III), different redox in-teractions between BCs and Cr/As and release profiles between BCs and Cr/As together lead to reduced combined cytotoxicity of BP-BC-Cr(VI) and BP-BC-As(III). It suggests that the valence state changes of metal ions due to redox effects is one of the parameters to be focused on when studying the combined toxicity of complexes of BCs with different heavy metal ions.
引用
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页数:10
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