原子荧光光谱法测定农药中砷和汞的方法研究

农药中的砷、汞是使农产品产生毒性的重要原因,为探究农药中砷和汞同时检测的方法,通过原子荧光光谱对农药中砷和汞进行测定,讨论了不同前处理方法对测定结果的影响,最终确定了王水消解样品-原子荧光光谱法同时测定砷和汞的方法,该方法对砷和汞的回收率分别为90.1%~104.0%和89.5%~96.2%,检出限为0.14和0.003 1ng·mL-1,RSD为4.9%和5.2%,当砷的质量浓度处于0~100.0ng·mL-1,汞的质量浓度处于0~2.0ng·mL-1时,标准曲线均能呈良好的线性关系,相关系数分别为1.000和0.999 8,结果满意。

Study on Determination of Arsenic and Mercury in Pesticides

Arsenic and mercury in pesticides are the important reasons for toxic of agricultural productions ,in order to explore the determination methods for arsenic and mercury .Therefore ,through the determination of arsenic and mercury in pesticides by atomic fluorescence spectrometry （AFS） ,the effect of different pretreat-ment methods on the results was discussed ,a method was established ultimately based on aquafortis digestion samples and determined by AFS ,recoveries of arsenic and mercury were 90 .1% ～ 104 .0% and 89 .5% ～96 .2% ,detection limits were 0 .14 and 0 .003 1 ng·mL-1 ,relative standard deviations were 4 .9% and 5 .2% ,standard curves showed good linear relationship with the correlation coefficient of 1 .000 and 0 .999 8 when concentrations of arsenic was 0～100 .0 ng·mL-1 and mercury was 0～2 .0 ng·mL-1 ,results were satisfactory .