Effect of suspended particles with different grain sizes on the bioaccumulation of PAHs by zebrafish (Danio rerio).
Effect of suspended particles with different grain sizes on the bioaccumulation of PAHs by zebrafish (Danio rerio).
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DOI：
10.1016/j.chemosphere.2019.125299
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发表时间：
2020-03
期刊：
影响因子：
8.8
通讯作者：
Yawei Zhai;X. Xia;Haotian Wang;Hui Lin
中科院分区：
文献类型：
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作者：
Yawei Zhai;X. Xia;Haotian Wang;Hui Lin
河流中不同大小的悬浮物具有不同的物理化学特征。本文采用被动投药装置研究了3种不同大小(63-10~6 μm、20-63 μm和20 μm)的多环芳烃(1 g Evior−1)在斑马鱼体内的生物累积效应，以维持水中多环芳烃D10的自由溶解浓度恒定。结果表明，三种粒度的SPS均可被斑马鱼摄取，且三种粒度的SPS摄入量无显著差异。3种不同粒径的SPS均能促进斑马鱼体内PAHs-D10的浓度(脂归一化或非脂归一化)，且斑马鱼中PAH-D10的浓度随颗粒的减小而增加。在63-106 μm、20-63 μm和20 μm的水样中暴露20 h后，斑马鱼体内多环芳烃-D10的脂归一化浓度与不含水样的相比分别提高了12%-72%、34%-130%和60%-196%。颗粒较小的水样对斑马鱼的影响较大，可能是由于其有机碳含量较低、黑碳/有机碳含量较低、颗粒较小、溶解有机质含量较高，从而促进了斑马鱼对多环芳烃-D10的解吸和对斑马鱼的生物可及。本研究建议在水环境疏水有机物生态风险评价中，除考虑SPS浓度外，还应考虑悬浮颗粒物的大小。
The physicochemical characteristics are different for suspended particles (SPS) with different sizes in rivers. Here, we studied the effect of SPS (1 g L−1) with three different sizes (63–106 μm, 20–63 μm, and <20 μm) on the bioaccumulation of deuterated polycyclic aromatic hydrocarbons (phenanthrene-d10, anthracene-d10, fluoranthene-d10 and pyrene-d10) in zebrafish using passive dosing devices to maintain the freely dissolved concentrations of PAHs-d10 constant in water. The results showed that all the three grain size SPS could be ingested by zebrafish, and there was no significant difference in the amount of ingested SPS among the three grain sizes. The concentrations (lipid-normalized or not) of PAHs-d10 in zebrafish were promoted in the presence of the three different size SPS, and the PAH-d10 concentrations in zebrafish increased with decreasing particle size. Compared with the systems without SPS, the lipid-normalized concentrations of PAHs-d10 increased by 12%–72%, 34%–130%, and 60%–196%, respectively in zebrafish in systems with 63–106 μm, 20–63 μm, and <20 μm of SPS after exposure for 20 h. The stronger effect of SPS with smaller grain sizes was probably due to their lower organic carbon content, lower ratio of black carbon to organic carbon content, smaller particle size, and higher dissolved organic matter contents, which could promote the desorption of PAHs-d10 from ingested SPS and bioaccessibility of PAHs-d10 to zebrafish. This study suggests that in addition to SPS concentration, the suspended particle size should be considered in ecological risk assessment for hydrophobic organic compounds in aquatic environment.