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目的建立一种同时测定饮用水中7种有机磷农药残留量的气相色谱-三重四极杆质谱(GC-MS/MS)方法。方法采用液-液萃取方法,用二氯甲烷对水样中7种有机磷农药进行提取,无水硫酸钠脱水,滤液在40℃水浴中旋转蒸发近干,用二氯甲烷定容,GC-MS/MS测定,外标法定量。结果 7种有机磷农药在21 min内分离,在0.01~10 mg/L范围内相关系数r2均在0.99以上,在0.05、0.25和0.45 mg/L 3个水平加标回收率在78.9%~99.3%之间,相对标准偏差均小于10%,检出限为0.02~0.06μg/L。结论该方法操作简单,准确度和精密度高,消除了其他有机磷农药的干扰,避免假阳性的出现,适用于饮用水中7种有机磷农药残留量的检测和确证。
Objective To establish a gas chromatography-triple quadrupole mass spectrometry (GC-MS / MS) method for simultaneous determination of seven organophosphorus pesticide residues in drinking water. Methods Seven kinds of organophosphorus pesticides in water were extracted by liquid-liquid extraction with dichloromethane, dehydrated with anhydrous sodium sulfate, the filtrate was nearly evaporated by rotary evaporation in a water bath at 40 ° C, fixed with dichloromethane, fixed with GC- MS / MS determination, external standard method. Results Seven kinds of organophosphorus pesticides were separated within 21 min. The correlation coefficients r2 were all above 0.99 in the range of 0.01-10 mg / L, and the recoveries were in the range of 78.9% -99.3 at 0.05, 0.25 and 0.45 mg / L %, The relative standard deviations were less than 10%, the detection limit was 0.02 ~ 0.06μg / L. Conclusion The method is simple, accurate and precise. It eliminates the interference of other organophosphorus pesticides and avoids the appearance of false positives. It is suitable for the detection and confirmation of 7 organophosphorus pesticide residues in drinking water.