Effect of titanium dioxide nanoparticles on copper toxicity to Daphnia magna in water: Role of organic matter

被引：51

作者：

Fan, Wenhong ^{[1
]}

Peng, Ruishuang ^{[1
]}

Li, Xiaomin ^{[1
]}

Ren, Jinqian ^{[1
]}

Liu, Tong ^{[1
]}

Wang, Xiangrui ^{[1
]}

机构：

[1] Beihang Univ, Sch Space & Environm, Dept Environm Sci & Engn, Beijing 100191, Peoples R China

来源：

WATER RESEARCH | 2016年 / 105卷

基金：

中国国家自然科学基金;

关键词：

Organic matter; Titanium dioxide nanoparticles; Heavy metals; Toxicity; Aquatic organisms; TROUT ONCORHYNCHUS-MYKISS; TIO2; NANOPARTICLES; HUMIC-ACID; OXIDATIVE STRESS; FACTORIAL APPROACH; CADMIUM; BIOACCUMULATION; ADSORPTION; NANO-TIO2; BIOAVAILABILITY;

D O I：

10.1016/j.watres.2016.08.060

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Inevitably released into natural water, titanium dioxide nanoparticles (nano-TiO2) may affect the toxicity of other contaminants. Ubiquitous organic matter (OM) may influence their combined toxicity, which has been rarely reported. This study investigated the effect of nano-TiO2 on Cu toxicity to Daphnia magna and the role of OM (dissolved or particle surface bound) in inducing combined effects. The effect of nano-TiO2 on heavy metal accumulation depended on the adsorption capacity for heavy metals of nano TiO2 and the uptake of nano-TiO2 metal complexes by organisms. Nano-TiO2 significantly decreased Cu accumulation in D. magna, but the reducing effect of nano-TiO2 was eliminated in the presence of humic acid (HA, a model OM). In the Cu and HA solution, nano-TiO2 slightly affected the bioavailability of Cu2+ and Cu HA complexes and thus slightly influenced Cu toxicity. The nanoparticle surface-bound HA reduced the effect of nano TiO2 on the speciation of the accumulated Cu; therefore, the combined effects of nano-TiO2 and Cu on biomarkers similarly weakened. HA-altered Cu speciation may be the main factor responsible for the influence of HA on the combined effects of nano-TiO2 and Cu. This study provides insights into the combined effects of nano TiO2 and heavy metals in natural water. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：129 / 137

页数：9

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