土壤中微囊藻毒素MC-LR的降解研究  

Degradation of MC-LR in soil

作　　者：黄缤慧 向垒[1] 邓哲深 温宏飞[1] 陈雷[1] 詹晓静[1] 莫测辉[1] 蔡全英[1] 李彦文[1] 

机构地区：[1]广东省环境污染控制与修复材料工程技术研究中心暨南大学环境学院,广州510632

出　　处：《环境科学学报》2016年第11期4193-4198,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.41301337);广东省自然科学基金重点项目(No.2011020003196);广东省科技计划省部产学研项目(No.2013B090600143);广东省高校高层次人才项目~~

摘　　要：微囊藻毒素(MCs)是蓝藻水华污染产生的一类生物毒素,通过灌溉、施肥等途径进入农田土壤,对农产品质量和地下水安全造成危害,进而影响人体健康.其中MC-LR是毒性较大、检出较普遍的藻毒素之一.本文通过模拟实验,研究了MC-LR在土壤中的生物降解行为及其影响因素.结果表明,MC-LR为易降解有机污染物,土壤理化性质可影响其在土壤中的降解行为,呈现土壤pH越低、阳离子交换量越大,MC-LR老化系数越大,降解越慢的特征.然而,初始浓度对MC-LR的降解没有影响.微生物降解是土壤中MC-LR降解的主要途径,温度、含水率等环境因素对MC-LR降解的影响主要在于改变土壤中降解微生物的活性.研究结果为评估土壤中MC-LR的生态风险提供了依据.Microcystins（ MCs） is a biotoxin produced by aquatic cyanobacteria bloom. It can be transferred into the soil-plant system via irrigation or fertilization. Microcystin-LR（ MC-LR） is one of MCs commonly studied for its toxicity and high detection frequent. In the present study,degradation of MC-LR in soils was investigated by simulation experiment. Results showed that MC-LR was an easily degradable organic pollutant. Degradation of MC-LR was affected by the soil physiochemical property and the degradation increased with the increasing pH value and decreasing cation exchange capacity.However,degradation of MC-LR was hardly affected by the initial concentration. Microbes played a major role in the degradation of MC-LR in soil. The influences of environmental factors including temperature and soil moisture on the degradation of MC-LR occurred by changing soil microbial activity. The results provided useful information for evaluating the ecological risks of MC-LR in soil.

关 键 词：MC-LR 土壤 降解 影响因素 

分 类 号：X53[环境科学与工程—环境工程]