UV和UV/H_2O_2对藻毒素MCLR降解及脱毒的研究  

Degradation and Detoxification of Algal Toxin MCLR by UV and UV/H_2O_2

作　　者：梁志霞[1] 梁文艳[1] 许佳[1] 

机构地区：[1]北京林业大学环境科学与工程学院,北京100083

出　　处：《环境科学与技术》2010年第S1期97-100,共4页Environmental Science & Technology

基　　金：北京林业大学优秀青年教师科技创新专项计划(BLYX200909);国家自然科学基金项目(50678024);国家水体污染控制与治理科技重大专项(2008ZX07314-006)

摘　　要：对UV和UV/H2O2降解藻毒素MCLR的效能及其影响因素进行了研究,并采用发光菌急性毒性和蚕豆根尖微核生物测试方法研究了降解过程中的溶液毒性状况。结果表明,UV和UV/H2O2均能较好降解去除MCLR,去除率可达到100%。初始的H2O2浓度和MCLR浓度对MCLR的降解存在明显影响。在UV和UV/H2O2降解MCLR溶液的过程中,会产生具有一定急性毒性的物质,导致发光菌相对发光度下降,但这些物质能继续被氧化为毒性较小的物质,使溶液最终相对发光度维持在80%左右。MCLR具有较明显的遗传毒性,降解过程中,溶液微核率随MCLR浓度减小而降低,当MCLR浓度未检出时,溶液的微核率与阴性对照组无显著性差异。The paper studied the degradation of algal toxin Microcystin-LR by UV and UV/H2O2 oxidation and the effects of influence factors on MCLR removal. The toxicity variation of water samples during UV and UV/H2O2 treatment was also detected using acute toxicity assay of luminescent bacteria and micronucleus assay of vicia faba root tip. The results showed that UV and UV/H2O2 were effective in degrading MCLR and the removal efficiency could reach 100%. Initial concentration of H2O2 and MCLR influenced the degradation effect of MCLR obviously. During UV and UV/H2O2 treatment,some acute toxic substances were produced and led to the decrease of relative luminosity of luminescent bacteria. However,they could be further oxidized to less toxic substances and the relative luminosity of samples kept at about 80% finally. MCLR had an obvious genetic toxicity. The micronucleus rate of water samples was decreased during MCLR degradation. When MCLR was degraded completely,there was no significant difference of micronucleus rate between water samples and negative control samples.

关 键 词：MCLR UV UV/H2O2 毒性 脱毒 

分 类 号：X52[环境科学与工程—环境工程]