Effect of coexposure to DDT and manganese on freshwater invertebrates: pore water from contaminated rivers and laboratory studies.

Facultad de Medicina, Universidad Autónoma de San Luis Potosí, San Luis Potosí, SLP 78210, Mexico.
Environmental Toxicology and Chemistry (Impact Factor: 3.23). 09/2005; 24(8):2037-44.
Source: PubMed


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.

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Available from: Roberto Rico-Martínez, Oct 01, 2015
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    • "Rosko and Rachlin reported the effect of several metals on the growth of a marine diatom and found that the Mn is the least toxicant (25.7 ppm equals to 50% growth depression) compared to Cu (0.033 ppm), Zn (0.27 ppm) and Co (10.2 ppm) [6]. However, acute toxicity of Mn for aquatic microbes was observed and, coexposure to Mn and DDT was significantly more toxic than any of the singly tested compounds [4]. Mn(II) can also cause neurotoxicity to human beings in terms of a syndrome resembling Parkinson's disease as indicated by Roth et al. [7]. "
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