微波消解样品-原子荧光光谱法测定食糖中总砷  

AFS Determination of Total Arsenic in Sugar with Microwave Assisted Sample Digestion

作　　者：王天顺[1,2] 杨玉霞[3] 朱俊杰[1,2] 陈赶林[1,2] 唐昭领[1,2] 

机构地区：[1]广西甘蔗研究所,南宁530007 [2]农业部甘蔗品质监督检验测试中心,南宁530007 [3]广西农业科学院植物保护研究所,南宁530007

出　　处：《理化检验（化学分册）》2010年第11期1332-1333,1336,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：基本科研业务专项(G2008011)

摘　　要：用硝酸及过氧化氢在MWS-2型微波消解系统中将食糖样品作加压消化处理,所得试液蒸发赶去多余的硝酸后,加入抗坏血酸及硫脲混合溶液作预还原剂和掩蔽剂后定容至50 mL,采用原子荧光光谱法测定含砷量。砷质量浓度在10.0μg.L-1以内与其对应的峰面积呈线性关系。方法的检出限(3s/k)为0.045μg.L-1。应用此方法分析了两种食糖样品,并以此两样品作基体,用标准加入法作回收试验,测得其平均回收率分别为96.7%及100.0%。The sugar sample was digested with HNO3 and H2O2 in the MWS-2 microwave sample digestion system under pressure.The solution obtained was then evaporated to expel excess nitric acid.Mixed solution of thiourea and ascorbic acid was added as pre-reductant and complexing agent and the solution,after diluting to 50 mL,was used for AFS determination of arsenic under the optimum working condition of the instrument.Linear relationship between values of peak area and mass concentration of arsenic was obtained in the range within 10.0 μg·L-1,and the detection limit（3s/k） found was 0.045 μg·L-1.Two sugar samples were analyzed by this method,and recovery was tested by standard addition method using these 2 samples as matrixes,giving values of average recovery of 96.7% and 100.0%.

关 键 词：原子荧光光谱法 微波样品消解 砷 食糖 

分 类 号：O657.31[理学—分析化学]