| 漓江流域桂林市区段有机磷农药和磺胺类抗生素的复合污染及其生态风险 |
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| 引用本文： | 刘洁雪,梁萧,覃礼堂,莫凌云,梁延鹏,曾鸿鹄,袁星义.漓江流域桂林市区段有机磷农药和磺胺类抗生素的复合污染及其生态风险[J].环境科学研究,2022,35(1):60-69. |
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| 作者姓名： | 刘洁雪 梁萧 覃礼堂 莫凌云 梁延鹏 曾鸿鹄 袁星义 |
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| 作者单位： | 1.桂林理工大学环境科学与工程学院, 广西环境污染控制理论与技术重点实验室, 广西 桂林 541004 |
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| 基金项目： | 国家重点研发计划项目(No.2019YFC0507504)；;桂林市科学技术研究开发项目(No.20180101-1,20180107-5)~~； |
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| 摘 要： | 为研究漓江流域桂林市区段的有机磷农药(OPs)和磺胺类抗生素(SAs)残留量和生态风险，在平水期、枯水期和丰水期采集流域水样，采用超高效液相色谱三重四级杆质谱联用仪对水样中目标污染物进行分析. 结果表明:①漓江流域桂林市区段水体检出敌百虫(TRC)、毒死蜱(CHP)、磺胺甲基嘧啶(SMR)、磺胺二甲嘧啶(SM2)和磺胺甲恶唑(SMZ)，浓度分别为nd~17.2、nd~2.32、0.05~20.6、0.07~15.37和0.87~17.48 ng/L (nd为未检出). ②SAs和OPs残留量随时间呈规律性变化，SAs浓度表现为丰水期>平水期>枯水期，OPs浓度表现为枯水期>平水期>丰水期. ③使用蛋白核小球藻对单一及其混合物进行毒性试验，得出OPs和SAs五元混合物对蛋白核小球藻的联合毒性在低于5%和19%~21%效应范围内呈现加和作用，5%~19%效应范围呈现协同作用，21%~26%效应范围内呈现拮抗作用，混合物在环境中检出最高浓度时对蛋白核小球藻的毒性产生加和作用. ④基于整体混合物风险熵的风险评估结果，漓江流域桂林市区段OPs和SAs混合污染对蛋白核小球藻产生中等生态风险；而基于单一污染物风险熵计算的混合物风险熵结果，OPs和SAs混合污染对蛋白核小球藻无生态风险，低估了混合污染物实际风险. 研究显示，不同方式获得的污染物预测无效应浓度对风险评估结果产生明显差异.
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| 关 键 词： | 有机磷农药(OPs) 磺胺类抗生素(SAs) 漓江流域 风险评估 蛋白核小球藻 |
| 收稿时间： | 2021-08-07 |
Combined Pollution and Ecological Risk of Organophosphorus Pesticides and Sulfonamides Antibiotics in Guilin Section of Lijiang River Basin |
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| LIU Jiexue,LIANG Xiao,QIN Litang,MO Lingyun,LIANG Yanpeng,ZENG Honghu,YUAN Xingyi.Combined Pollution and Ecological Risk of Organophosphorus Pesticides and Sulfonamides Antibiotics in Guilin Section of Lijiang River Basin[J].Research of Environmental Sciences,2022,35(1):60-69. |
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| Authors: | LIU Jiexue LIANG Xiao QIN Litang MO Lingyun LIANG Yanpeng ZENG Honghu YUAN Xingyi |
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| Abstract: | In order to study the residues and ecological risks of organophosphorus pesticides (OPs) and sulfonamide antibiotics (SAs) in Guilin section of Lijiang River Basin, water samples were collected during normal, dry and wet seasons. The target pollutants in the water samples were analyzed using a high-performance liquid chromatography tandem mass spectrometer. The detected concentrations of Dipterex (TRC), chlorpyrifos (CHP) sulfamerazine (SMR), sulfamethazine (SM2), and sulfamethoxaole (SMZ) were nd-17.2, ND-2.32, 0.05-20.6, 0.07-15.37 and 0.87-17.48 ng/L, respectively. The residual concentrations of SAs and OPs change regularly with time, the concentrations of SAs were wet season>normal season>dry season, and the concentrations of OPs were dry season>normal season>wet season. The toxicities to Chlorella proteinosa were performed on single substances and mixtures. The combined toxicity of the five-component mixture of OPs and SAs to Chlorella proteinosa was found to be additive in the effect range below 5% and 19%-21%, synergistic in the effect range of 5%-19%, and antagonistic in the effect range of 21%-26%. The highest concentration of the mixture detected in the environment showed an additive effect on the toxicity of Chlorella proteinacea. The results of ecological risk of OPs and SAs mixture on Chlorella proteinosa showed that the predicted no-effect concentrations of pollutants obtained by different methods had significant impact on the risk assessment. According to the risk assessment calculated by the whole mixture risk quotient, the combined pollution of OPs and SAs in the Lijiang River Basin posed a moderate ecological risk to Chlorella proteinosa. The mixture risk quotient calculated from individual compound indicated no risk to Chlorella proteinosa, which underestimated the actual ecological risk of the mixture. The results of this study have important reference value for accurately assessing the ecological risk of mixed pollutants. |
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