微波消解-双道原子荧光光度计测定沙棘汁、沙棘果粉中的铅、砷、汞

摘要

Trace lead, arsenic and mercury in sea-buckthorn juice and sea-buckthorn-fruit-powder were determined by using microwave digestion-double lines AFS. The working conditions of instrument were discussed as well as influential factors including the sample digestion condition, potassium borohydride dosage, concentration and kinds of acids. The results show that detection limit of the method for each element is 0.000 1, 0.000 2, 0.000 02 mg/kg, respectively;The RSD is in the range of 1.20%~4.83%and the recoveries are in the range of 92%~105%.%采用微波消解技术-双道原子荧光法测定了沙棘汁、沙棘果粉中的痕量元素铅、砷、汞。对仪器的工作条件作了详述,还就各种对测定有影响的因素,包括样品消解条件,硼氢化钾的浓度、介质的种类及浓度等也作了研究并予以优化选择。方法对这3种元素的检出限为0.0001,0.0002,0.00002 mg/kg，相对标准偏差为1.2%~4.83%，用加标回收率评价方法的准确性，回收率为92%~105%。