摘要
应用气相色谱-质谱法测定及确证粮谷(糙米、玉米)中特丁磷的残留量,试样用水-丙酮提取,提取液经与乙酸乙酯液-液分配后,再以PT-硅镁柱净化,用气相色谱-质谱选择检测器监测离子测定方式(GC-NSD-SIM)来进行测定和阳性确证。特丁磷选择监测离子为(m/z231、233、288),其丰度比约为100:14:11。采用外标法定量,检出限为0.002mg/kg。
The residual terbufos in cereals(unpolished rice and maize) was extracted by water-acetone,the extract was partitioned with ethyl acetate.Cleaned up by passing through a FT-silica magnesium cartridge.The analysis of terbufos by gas chromatograph equipped with mass selective detector(GC-MSD) on a DB-17(30 m×0.25 mm i.d.,0.25μm) capillary column.The determination and confirmation were made by means of selected monitoring ions(SM) mode,SIM(m/z) were 231,233,288 amu( abundance ratio was 100:14:11),using external standard method.The detection limit was 0.002 mg/kg,the average recovery was 86.3%-95.9% and the RSD( n=10) was 5.14%-6.81%.
出处
《化学分析计量》
CAS
2000年第1期9-11,共3页
Chemical Analysis And Meterage
