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首页> 外文期刊>Environmental toxicology and chemistry >EFFECT OF COEXPOSURE TO DDT AND MANGANESE ON FRESHWATER INVERTEBRATES: PORE WATER FROM CONTAMINATED RIVERS AND LABORATORY STUDIES
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EFFECT OF COEXPOSURE TO DDT AND MANGANESE ON FRESHWATER INVERTEBRATES: PORE WATER FROM CONTAMINATED RIVERS AND LABORATORY STUDIES

机译：滴滴涕和锰共同暴露对淡水无脊椎动物的影响：受污染河流的孔隙水和实验室研究

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An environmental survey of several rivers of the southern Huasteca area of Mexico revealed high concentrations of manganese (Mn) and the presence of DDT in the sediments and pore water. Therefore, acute (48-h) toxicities of Mn and DDT were assessed both independently and as a combination on 24-h-old neonates of Daphnia magna Strauss and Lecane quadridentata Ehrenberg. Daphnia magna showed high sensitivity to both toxicants, whereas L. quadridentata was highly resistant to DDT and less susceptible to Mn. For D. magna, the Mn and DDT coexposure was significantly more toxic than any of the singly tested compounds. When D. magna was exposed to sediment pore water, no association was found between the Mn content in the samples and the observed toxicity. Preliminary particle analysis of pore water showed different compounds of Mn, which apparently were not in bioavailable form.
机译：墨西哥南部Huasteca地区的几条河流的环境调查显示，沉积物中的锰（Mn）含量高，沉积物和孔隙水中存在滴滴涕。因此，对Daphnia magna Strauss和Lecane quadridentata Ehrenberg的24小时新生儿分别和联合评估了Mn和DDT的急性（48-h）毒性。大型蚤（Daphnia magna）对两种毒物均显示高敏感性，而四方乳杆菌对滴滴涕具有高度抗性，而对锰的敏感性较低。对于D. magna，Mn和DDT共同暴露的毒性比任何单独测试的化合物都要高。当D. magna暴露于沉积物孔隙水中时，样品中的Mn含量与观察到的毒性之间没有发现关联。孔隙水的初步颗粒分析显示不同的Mn化合物，这些化合物显然不是生物可利用的。

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