全自动热解测汞仪测定粮食中汞及干扰分析

Determination of total mercury in grain by direct mercury analyzer and the study of interference

介绍了一种快速测定粮食中总汞的分析方法,本方法基于“燃烧-催化燃烧-冷原子吸收(C-CAAS)”原理,可准确测定汞含量较低粮食样品如大米、小麦、玉米等。将本方法与国标GB/T5009.17—2014中“化学蒸汽发生-原子荧光法(HG-AFS)”进行对比,结果表明:本方法准确度、重复性均优于国标推荐方法,是一种高效、环保的汞分析技术。以进样量0.20g计算,方法检出限为0.02μg/kg,定量限为0.08μg/kg,相对标准偏差1.2%(@1ngHg),样品加标回收率为90.2%~102.7%。这种快速、准确的汞分析方法,是粮食质量安全监管的利器,可指导超标粮食收购与储存,严防不符合食品安全标准的粮食流入口粮市场。

This method is based on combustion-cold atomic absorption spectrometry(C-CAAS)for determination of low-level mercury grain samples,such as rice,wheat and maize.When the injection mass is 0.2g,the detection limit is 0.02μg/kg,the quantitative limit is 0.08μg/kg,the relative standard deviation is 1.2%(at 1ng Hg),and the recovery rate is 90.2%-102.7%.