POPs污染物莠去津在长期定位施肥土壤中的残留动态  

Degradation Dynamics of POPs Atrazine in Soils Under Long-Term Located Fertilization Conditions

作　　者：王军[1] 朱鲁生[1] 谢慧[1] 宋艳[1] 孙瑞莲[2] 张夫道[3] 

机构地区：[1]山东农业大学资源与环境学院,泰安271018 [2]山东大学环境研究院,济南250100 [3]中国农业科学院农业资源与农业区划研究所,北京100081

出　　处：《环境科学》2007年第12期2821-2826,共6页Environmental Science

基　　金：国家自然科学基金项目(20477022);科技部社会公益研究专项基金项目(2000-177);山东省优秀中青年科学家科研奖励基金项目(03BS123)

摘　　要：在建立土壤中莠去津残留分析方法的基础上,采用室内培养法研究了该药在长期定位施肥处理土壤中的降解动态.土壤中的莠去津残留物用丙酮提取,经液-液分配和柱层析净化后,气相色谱检测.莠去津的最低检出量为6.4×10-12g,在土壤中的最低检出浓度为6.4×10-9g.kg-1,土壤中0.11、1.1、11.0 mg.kg-1这3个浓度的添加回收率分别为91.41%±4.36%、93.58%±4.54%、90.35%±3.59%,符合农药残留分析要求.运用该残留分析方法研究了莠去津在长期定位施肥处理土壤中的残留动态.结果表明,莠去津在土壤中的降解遵循一级动力学方程,其在CK、NPK、NPK+M、NPK+S施肥处理土壤中的降解半衰期分别为20.6、23.0、28.5、33.2 d,由LSR分析可知,NPK肥和有机肥的施入明显加快了莠去津在土壤中的降解.单独回归及逐步回归分析均证实莠去津在土壤中的降解半衰期与土壤中的碱解氮、有机质和全氮含量之间存在良好的正相关,其相关系数分别为0.998 30、.982 6和0.952 1,原因可能是这些土壤养分为土壤微生物的活动提供了足够的碳素和氮素,微生物活性较高,从而致使莠去津在土壤中降解加快.To evaluate the difference of POPs atrazine degradation dynamics in soils under different fertilization conditions, we set up an analysis method of the atrazine residue in soils and studied residue dynamics of atrazine in soils under a long-term located fertilization conditions. After extracted by surging with acetone, liquid-liquid partition and eluted through florisil, the residue of atrazine in soils was detected by gas chrematogram with ^63 Ni-ECD. The minimum detectable quantity of atrazine is 6.4 × 10^-12 g and the minimum detectable concentration is 6.4 × 10^-9 g·kg^-1 in the soil. The spiked recoveries of atrazine with the three concentration of O. 11,1.1,11.0 mg·kg^-1 t in soils are 91.41 % ± 4.36% ,93.58% ± 4.54%, 90.35% ± 3.59%, according with the request of pesticide residue analysis. The degradation of atrazine in soil under a long-term located fertilization conditions was studied. The results show the degradation of atrazine follows stair dynamic equation, and the degradation half-life of atrazine in soils fertilized with CK, NPK, NPK ＋ M, NPK ＋ S are 20.6, 23.0, 28.5, 33.2 d, respectively. Subjected to analysis of LSR, NPK and organic fertilizers are obviously propitious to the degradation of atrazine. The separate regression and stepwise regression analysis prove the degradation half-life of atrazine in soils is well related with the content of alkaline nitrogen, organic matter and total nitrogen, and the coefficients are 0.998 3, 0.982 6 and 0.952 1, respectively. Maybe the reason is that these soil nutrient substance offers enough the element carbon and nitrogen for action of microbe, and the higher action of microbe quickens the degradation of atrazine in soils.

关 键 词：莠去津 土壤 残留 降解 

分 类 号：X172[环境科学与工程—环境科学] S154[农业科学—土壤学]