乙撑硫脲在人参茎叶中的残留动态  

Residual Decline of Ethylenethiourea in the Stem and Leaf of Panax ginseng

作　　者：许允成[1] 王春伟[2] 高洁[2] 

机构地区：[1]吉林农业大学资源与环境学院,长春130118 [2]吉林农业大学农学院,长春130118

出　　处：《农药》2011年第8期591-593,共3页Agrochemicals

基　　金：国家科技支撑计划(2007BAQ00159-01);吉林省科技发展计划(20090903)

摘　　要：[方法]通过田间试验和液相色谱分析技术研究了75%代森锰锌代谢物乙撑硫脲在茎和叶中残留动态和最终残留量。[结果]吉林抚松田间试验结果表明:施药剂量为推荐剂量的2倍(6 250 g a.i./hm2)时,乙撑硫脲在茎和叶中原始沉积量分别为0.782、8.23 mg/kg;半衰期分别为4.9、19.5 d。施药1次,测得茎中乙撑硫脲残留量14 d后低于欧洲规定的MRL值(0.05 mg/kg),而叶中乙撑硫脲残留量均高于欧洲规定的MRL值(0.05 mg/kg)。[结论]综合多方面因素,按照推荐剂量3 125 g a.i./hm2处理,建议我国在茎上乙撑硫脲的MRL值可暂定为0.05 mg/kg,茎安全间隔期为14 d,而叶上的残留量较高,建议MRL值可暂定为0.50 mg/kg,叶安全间隔期无法确定,施药次数为1次。[Methods]Field trial and high performance liquid chromatography were carried out to study residual dynamics and final residues of mancozeb＇s metabolite ethylenethiourea in the stem and leaf of Panax ginseng.[Results]The results of field trial in Fusong of Jilin province showed that when the sprayed dose was twice of the recommended dosage（6？250 g a.i./ha）,the original sedimentary of ethylenethiourea dosage were 0.782 and 8.23 mg/kg in the stem and leaf of P.ginseng respectively,and the half-lives were 4.9 and 19.5 d in the stem and leaf of P.ginseng respectively.The results revealed that the ethylenethiourea residue in the stem of P.ginseng was below the MRL of Europe（0.05 mg/kg）.However,the ethylenethiourea residue in the leaf of P.ginseng was above the MRL of Europe（0.05 mg/kg） 14 days after sprayed once.[Conclusions]The dosage of 3125 g a.i./ha of ethylenethiourea was recommended to apply in the stem of P.ginseng,the MRL of ethylenethiourea may be suggested to be 0.05 mg/kg temporarily and the preharvest interval of ethylenethiourea may be set at 14 days,but the residues in the leaf of P.ginseng were a little higher to recommend the preharvest interval of ethylenethiourea,the MRL of ethylenethiourea cannot be suggested,application times is once.

关 键 词：乙撑硫脲 人参 残留 茎 叶 液相色谱 

分 类 号：S481.8[农业科学—农药学]