农药学学报
農藥學學報
농약학학보
CHINESE JOURNAL OF PESTICIDE SCIENCE
2014年
4期
457-461
,共5页
噻虫嗪%菠菜%保护地%露地%残留%消解规律
噻蟲嗪%菠菜%保護地%露地%殘留%消解規律
새충진%파채%보호지%로지%잔류%소해규률
thiamethoxam%spinach%greenhouse%open field%residue%decline study
利用液相色谱-串联质谱仪建立了菠菜中噻虫嗪残留量的检测方法，并根据农药残留登记田间试验方法研究了25％噻虫嗪水分散粒剂在保护地和露地菠菜中的残留规律。结果表明：噻虫嗪在2种栽培条件下的消解动态均符合一级动力学模型，但在保护地菠菜中的消解速率明显比露地的慢，半衰期分别为4?08和1?28 d；25％噻虫嗪水分散粒剂按推荐剂量（有效成分）30 g/hm2和1?5倍推荐剂量45 g/hm2，分别对水喷雾施药2～3次，施药间隔期为7 d，于距离末次施药3、5、7 d采样测定，噻虫嗪在保护地菠菜中的残留量明显高于露地的。我国暂未制定噻虫嗪在菠菜上的最大残留限量（ MRL），参照其在甘蓝上的MRL值（0?2 mg/kg），噻虫嗪在保护地和露地栽培时的安全间隔期分别应为7和3d以上。在菠菜种植中使用噻虫嗪时应根据不同栽培条件设定不同的安全采收间隔期，从而降低其风险。
利用液相色譜-串聯質譜儀建立瞭菠菜中噻蟲嗪殘留量的檢測方法，併根據農藥殘留登記田間試驗方法研究瞭25％噻蟲嗪水分散粒劑在保護地和露地菠菜中的殘留規律。結果錶明：噻蟲嗪在2種栽培條件下的消解動態均符閤一級動力學模型，但在保護地菠菜中的消解速率明顯比露地的慢，半衰期分彆為4?08和1?28 d；25％噻蟲嗪水分散粒劑按推薦劑量（有效成分）30 g/hm2和1?5倍推薦劑量45 g/hm2，分彆對水噴霧施藥2～3次，施藥間隔期為7 d，于距離末次施藥3、5、7 d採樣測定，噻蟲嗪在保護地菠菜中的殘留量明顯高于露地的。我國暫未製定噻蟲嗪在菠菜上的最大殘留限量（ MRL），參照其在甘藍上的MRL值（0?2 mg/kg），噻蟲嗪在保護地和露地栽培時的安全間隔期分彆應為7和3d以上。在菠菜種植中使用噻蟲嗪時應根據不同栽培條件設定不同的安全採收間隔期，從而降低其風險。
이용액상색보-천련질보의건립료파채중새충진잔류량적검측방법，병근거농약잔류등기전간시험방법연구료25％새충진수분산립제재보호지화로지파채중적잔류규률。결과표명：새충진재2충재배조건하적소해동태균부합일급동역학모형，단재보호지파채중적소해속솔명현비로지적만，반쇠기분별위4?08화1?28 d；25％새충진수분산립제안추천제량（유효성분）30 g/hm2화1?5배추천제량45 g/hm2，분별대수분무시약2～3차，시약간격기위7 d，우거리말차시약3、5、7 d채양측정，새충진재보호지파채중적잔류량명현고우로지적。아국잠미제정새충진재파채상적최대잔류한량（ MRL），삼조기재감람상적MRL치（0?2 mg/kg），새충진재보호지화로지재배시적안전간격기분별응위7화3d이상。재파채충식중사용새충진시응근거불동재배조건설정불동적안전채수간격기，종이강저기풍험。
A simple, fast and easy operation method was developed for determining thiamethoxam residues in spinach by liquid chromatography-mass spectrometer ( LC-MS ) . The final residue and decline trend of thiamethoxam in greenhouse and open field were studied. The results showed that the decline dynamic of thiamethoxam in spinach in two different cultivation methods accorded with the first-order kinetics, and the decline rate of thiamethoxam in greenhouse spinach was slower than the other. The half-lives of thiamethoxam were 4?08 d and 1?28 d, respectively. When the spinach in greenhouse and open field was sprayed 2-3 times at an interval of 7 d with thiamethoxam 250 WDG with recommended dosage of 30 g a. i/hm2 and 1?5 times recommended dosage 45 g a. i/hm2 , 3, 5, 7 days after the last application, the final residues of thiamethoxam in greenhouse spinach were higher than thiamethoxam residues in open field spinach at harvesting. There is no MRL of thiamethoxam spinach set in China now. Referring to the MRL of 0?2 mg/kg in cabbage, the safe intervals of thiamethoxam in greenhouse spinach and in open field spinach should be more than 7 d and 3 d, respectively. From this study, in order to ensure the dietary risk in acceptable level, different pre-harvest intervals of thiamethoxam in spinach must be set according to different cultivation methods.
