ICP －MS 测定饼干中的铅、砷、铬、镉、铜、锌、铁和锰

摘要

Determination method of Pb,As,Cr,Cd,Cu,Zn,Fe and Mn in biscuit by ICP -MS was re-searched.The sample was digested by the full automatic microwave,the digestion solution was determined by ICP -MS with Bi,Ge,Sc and In as internal standard,the determination results were validated with the national standard method.The accuracy and reliability of the method were verified by the recovery and a-nalysis of the national standard substance wheat (GBW10052).It showed that all of the linearly depend-ent coefficients of the curves were more than 0.999,the detection limits varied from 0.002mg/kg to 0.500 mg/kg,the relative standard deviations were lower than 6.55%,the relative deviations of two methods between 3.73% ~8.40%,the recoveries were from 88.0% to 106% ,the results of determina-tion in the national standard substance of GBW10052 were all within the ranges of standard values.The test results are satisfied.%探讨了应用电感耦合等离子体质谱仪测定饼干中铅、砷、铬、镉、铜、锌、铁和锰8种重金属元素的方法。运用微波消解系统对样品进行消解，以铋、锗、钪和铟作为内标物，用 ICP －MS 对消解液进行检测，并采用国标方法对其结果进行验证。利用加标回收率试验和国家标准物质小麦（GBW 10052）检测试验考察了方法的准确性和可靠性。结果表明，该方法所测元素在标准溶液浓度范围内呈线性关系，相关系数均大于0.999，方法检出限在0.002～0.500 mg／kg 之间，相对标准偏差均小于6.55％，本法与国标方法测量结果的相对偏差在3.73％～8.40％之间，加标回收率在88.0％～106％之间，标准物质的测定值与标准参考值符合要求。