聚丙烯酰胺对蚯蚓的毒性效应

聚丙烯酰胺作为全球应用最广泛，用量最大的水处理剂，而其排放到环境中可能会对生态环境形成潜在的威胁。该研究在人工土壤条件下，通过急性和亚急性暴露试验研究了聚丙烯酰胺和丙烯酰胺对赤子爱胜蚓存活、生长和繁殖的影响，旨在评价聚丙烯酰胺和丙烯酰胺对蚯蚓的毒性效应。结果表明，聚丙烯酰胺和丙烯酰胺对蚯蚓的半致死剂量分别为大于2000和164.01?mg/kg，聚丙烯酰胺比丙烯酰胺毒性低；在急性和亚急性毒性暴露期内，聚丙烯酰胺对蚯蚓的存活和生长无显著影响；而当丙烯酰胺浓度大于100?mg/kg时即对蚯蚓的存活和生长产生显著的影响（P＜0.05）。聚丙烯酰胺和丙烯酰胺均对蚯蚓的繁殖能力有非常显著的影响（P＜0.05）。因此残留于污泥中的聚丙烯酰胺对环境有一定的潜在风险。

Toxicity effects of polyacrylamide to earthworm (Eisenia fetida)

Polyacrylamide is commonly used as a water-treatment agent in China and abroad, it may bring a potential threat to microorganisms when it is discharged into natural environments. To obtain toxicity information of polyacrylamide (PAM) and acrylamide (AM), the acute and sub-acute tests were conducted with specimens of Eisenia fetida using OECD (Organization for Economic Co-operation and Development) artificial soil in this study. The results showed that LC50 of PAM and AM were more than 2000 and 164.01 mg/kg, respectively, the toxicity of PAM was much lower than AM. There was no significant effect of PAM on the survival and growth of E. fetida in acute and sub-acute toxicity tests; while at the concentration of 100 mg/kg AM, it showed a significant toxicity effect (P<0.05). Earthworm reproduction rate was significantly affected by both PAM and AM (P<0.05). So, polyacrylamide residual in sewage sludge had potential ecological risk.