在线紫外消解-原子荧光光谱法测定黄酒中的砷

Determination of arsenic in yellow rice wine by online ultraviolet(UV) digestion-atomic fluorescence spectrometry

采用在线紫外消解-氢化物发生原子荧光光谱法测定黄酒中的砷。将自制的紫外消解与氢化物发生原子荧光光谱仪建立系统,考察了紫外消解功率、紫外消解管路长度、辅助消解剂浓度、溶液p H等因素对紫外消解效率的影响。在优化的实验条件下,砷的线性范围为0～40μg/L,相关系数r为0.9989,检出限为1.86μg/L,相对标准偏差为(n=12)3.57%,加标回收率为93.4%～104.6%,本法与国标法测定黄酒中砷的结果基本相同。可用本法代替国标法(GB5009.11-2014)中的氢化物发生原子荧光光谱法测定黄酒中的砷,既可提高工效十余倍,又减少了化学试剂对环境所造成的污染。

Arsenic（As） contents in yellow rice wine were determined by online ultraviolet （UV）＇digestion-hydride generation atomic fluorescence spectrometry.Potassium persulfate was used as auxiliary digestion agent.A home-made ultraviolet digester was coupled with hydride generation atomic fluorescence spectrometer to construct the analysis system. The effects of UV digestion power,length of UV digestion pipeline, concentration of auxiliary digestion agent and aqueous pH values on the UV digestion efficiency were studied.Under the optimal conditions, the linear range of arsenic was 0-40μg/L with a correlation coefficient （r） of 0.9989, detection limit, relative standard deviation （ n = 12 ） and spiked recovery were 1.86 μg/L, 3.57 % and 93.4%-104.6%, respectively.The determination results of arsenic in yellow rice wine obtained by this method were good in agreement with those of national standard method.This method could be used instead of the national standard method（ GB 5009.11 - 2014） for the determination of arsenic in yellow rice wine, which can not only improve the work efficiency more than ten times, but also reduce the environmental pollution caused by chemical reagents.