摘要
采用田间试验方法,研究了霜脲氰在马铃薯及土壤中的残留动态,应用液相色谱法测定了霜脲氰在马铃薯和土壤中的残留量。结果表明,霜脲氰在马铃薯和土壤中消解较快,半衰期分别为2.26d和5.75d,施药3240gai·hm-23次时,末次施药距收获间隔28d,霜脲氰的残留量在马铃薯中低于0.0098mg·kg-1,在土壤中为ND~0.0100mg·kg-1。该药属易分解农药(T1/2<30d),按推荐使用剂量使用是安全的。
In order to make up a standard procedure for safe use of cymoxanil on potatoes, a field experiment was conducted to reveal the residue dynamics of cymoxanil in potatoes and soil. The residues of cymoxanil (the active ingredient of 1/9 in mixed formulation) in potatoes and soil were determined by liquid chromatography procedure with the delectation conditions of UV detector, wavelength 254 nm and mobile phase/water (1/1,V/V). The method was accurate with the lowest detection limit, and could satisfy the requirement for rapid analysis of crymoxanil in samples. The average initial deposits (the active ingredient) in potatoes and soil at the application rate of 3 240 g ai.hm^-2 were 1.650 0 mg·kg^-1 and 0.110 0 mg·kg^-1 , respectively, and then residues in potatoes and soil decreased gradually as time went on. The dynamics of cymoxanil residues in potatoes and soil could be described, respectively, as y=l.0359e-0.3066t and y=0.0758e-0.1205t. The half-lives of cymoxanil in potatoes and soil were 2.26 days and 5.75 days, respectively. When sprayed 3 240 g ai ·hm^-2 on potatoes and soil two or three times, at the interval time of 3 days and 7 days, at the 28th day after the last application, the final residues of the cymoxanil were lower than 0.016 0 mg·kg^-1 in potatoes and ND-0.014 6 mg·kg^-1 in soil, and at the rate of 1 620 g ai·hm^-2, the final residue of Crymoxanil were ND and 0.009 2 mg·kg^-1 0.016 7 mg·kg^-1 , suggesting that cymoxanil belonged to non-persistent pesticides(T1/2〈30 days).
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第1期322-325,共4页
Journal of Agro-Environment Science
基金
美国杜邦公司资助项目
关键词
霜脲氰
马铃薯
土壤
消解动态
最终残留
液相色谱法
cymoxanil
potatoes
soil
degradation dynamics
final residues
liquid chromatography