Heavy metals and pesticides (HMPs) are common contaminants due to their extensive use worldwide. Diffusive gradients in thin films (DGT) are a good method for measuring the bioavailable concentration of pollutants. This study represents the first evaluation of HMP toxicity in aquatic biota using the DGT technique in sediments. Zhelin Bay was selected as the case study site because it has been contaminated by pollutants. Nonmetric multidimensional scaling (NMS) analysis reveals that a diverse range of pollutants (V, Cr, Ni, Cu, Zn, As, Se, InHg, Mo, Cd, Sb, W, Pb, CLP, PYR) are mainly influenced by sediment characteristics. Assessment of single HMP toxicity found that the risk quotient (RQ) values for Mn, Cu, inorganic Hg (InHg), chlorpyrifos (CLP) and diuron (DIU) are significantly higher than 1, indicating that the adverse effects of these single HMPs should not be ignored. The combined toxicity of HMP mixtures based on probabilistic ecotoxicological risk assessment shows that Zhelin Bay surface sediments had a medium probability (54.6%) of toxic effects to aquatic biota.

重金属和杀虫剂 (HMP) 是常见的污染物，因为它们在全球范围内广泛使用。薄膜扩散梯度 (DGT) 是测量污染物生物可利用浓度的好方法。这项研究代表了在沉积物中使用 DGT 技术对水生生物群中 HMP 毒性的首次评估。柘林湾被选为案例研究地点，因为它已被污染物污染。非度量多维标度 (NMS) 分析表明，多种污染物（V、Cr、Ni、Cu、Zn、As、Se、InHg、Mo、Cd、Sb、W、Pb、CLP、PYR）主要受沉积物影响特征。单一 HMP 毒性评估发现，Mn、Cu、无机汞 (InHg)、毒死蜱 (CLP) 和敌草隆 (DIU) 的风险商 (RQ) 值显着高于 1，表明这些单一 HMP 的不利影响不应被忽视。基于概率生态毒理学风险评估的 HMP 混合物的综合毒性表明，柘林湾表层沉积物对水生生物群产生毒性影响的概率中等（54.6%）。