【摘要】 建立了一种利用离线超临界CO2萃取气相色谱(SFE-GC)测定杨树体内中氧化乐果和敌敌畏分布动态的分析方法。超临界CO2萃取杨树体内氧化乐果和敌敌畏的适宜条件为:温度80℃、压力34.48MPa、调节剂甲醇(添加量0.70ml/g)、收集液丙酮、静态萃取时间25min、CO2流量为1ml/min、动态萃取18min。敌敌畏添加回收率为83.87%￣101.91%,相对标准偏差(RSD)为1.19%￣18.52%,氧化乐果添加回收率为75.34%￣95.43%,相对标准偏差(RSD)为3.72%￣14.14%,符合残留分析要求。整个分析时间小于3h。更多还原

【Abstract】 The insecticides omethoate and DDVP were extracted from poplar tissue by supercritical fluid extraction (SFE). The extraction conditions were optimized, including temperature, pressure, modifier, static time and dynamic extraction. Gas chromatography with electron-capture detection was used to examine the extracts. The selected conditions were 34.48 MPa, 80℃, 0.7 ml/g of methanol as static modifier, 25min of static time extraction, dynamic extraction with 18 ml of CO2, and 5 ml of acetone as collecting solvent. Recoveries ranged of omethoate from 75.34%~95.43%, DDVP as 83.87%~101.91%, and a method precision of 3.72%~14.14% (omethoate) and 1.19%~18.52% (DDVP) were obtained for spiking levels of 0.1~5 mg/kg.更多还原