电感耦合等离子体质谱法快速测定苦荞茶中铜、铅、镉、钴、镍

建立了用硝酸-高氯酸消解样品,电感耦合等离子体质谱法(ICP-MS)测定苦荞茶中铜、铅、镉、钴、镍的方法.方法具有灵敏度高、检出限低、精密度好、基体干扰少、准确可靠、快捷、简便的特点.各元素方法检出限(3SD,μg/L)分别为:铜0.009、铅0.023、镉0.015、钴0.022、镍0.035;方法精密度(RSD,n=12)分别为:铜2.5%～3.0%、铅2.1%～2.3%、镉3.0%～3.8%、钴2.5%～2.6%、镍1.5%～1.9%;各元素加标回收率分别为:铜95.0%～105.0%、铅95.0%～105.0%、镉98.0%～105.0%、钴95.0%～105.0%、镍95.0%～105.0%.在线用铑作为内标95.0%～105.0%.方法经国家一级标准物质验证,测定值与标准值吻合.应用于实际样品测定,结果满意.

Rapid Determination of Copper,Lead,Cadmium,Cobalt and Nickel in Tartary Buckwheat Tea by Inductively Coupled Plasma-Mass Spectrometry

A method of nitrate-perchloric acid digestion and inductively coupled plasma-mass spectrometric（ICP-MS） determination of copper,lead,cadmium,cobalt,nickel in tartary buckwheat tea is set up.The method is of high sensitivity,low detection limit,good precision,less matrix interference,accurate,reliable,fast,and simple.Detection limits（3SD,μg/L） for the method are 0.009 for Cu,0.023 for Pb,0.015 for Cd,0.022 for Co and 0.035 for Ni,precisions（RSD,n=12） are 2.5%～3.0% for Cu,2.1%～2.3% for Pb,3.0%～3.8% for Cd,2.5%～2.6% for Co and 1.5%～1.9% for Ni,and recoveries are 95.0%～105.0% for Cu,95.0%～105.0% for Pb,98.0%～105.0% for Cd,95.0%～105.0% for Co and 95.0%～105.0% for Ni respectively,with Rh as the internal standard.The method has been applied to the determination of these elements in the National Standard Reference Materials and the results are in agreement with the certified values.It has been used in the determination of real samples with satisfactory results.