标准模式电感耦合等离子体质谱法测定天然水体中铬和钒  

Determination of chromium and vanadium in natural water by standard mode inductively coupled plasma mass spectrometry

作　　者：苏思强 冯源强 李永林 周会东 陈洪流 李明礼 SU Siqiang;FENG Yuanqiang;LI Yonglin;ZHOU Huidong;CHEN Hongliu;LI Mingli(Central Laboratory of Tibet Bureau of Geology and Exploration,Lhasa 850000)

机构地区：[1]西藏自治区地质矿产勘查开发局中心实验室,拉萨850000

出　　处：《化学分析计量》2025年第3期56-62,共7页Chemical Analysis And Meterage

基　　金：西藏自治区中央引导地方项目(XZ202102YD0024C)。

摘　　要：建立标准模式下电感耦合等离子体质谱法测定天然水体中微量Cr和V。通过硝酸酸化至pH值小于2,加热煮沸并保持酸化水样微沸1~2 min,加入适量AgNO_(3)溶液,去除水样中存在的CO_(3)^(2-)、HCO_(3)^(-)、fCO_(2)(游离二氧化碳)、Cl^(-)杂质,在上机测定时尽可能降低C和Cl多原子离子带来的质谱干扰。52Cr、51V的质量浓度分别在0~100.0、0~50.0μg/L范围内与信号强度线性关系良好,相关系数分别为0.9998、0.9999,检出限分别为0.085、0.044μg/L。样品的平均回收率为97.68%~103.17%,测定结果的相对标准偏差小于5.0%(n=11),该方法检出限低、准确度高、重复性好,可以满足各类天然水体样品中微量Cr和V的准确测定。A method for the determination of trace Cr and V in natural water by inductively coupled plasma mass spectrometry in standard mode was established.The impurities in the water sample were removed by nitric acid acidification to a pH value of less than 2,heating and boiling,keeping the acidified water sample slightly boiled for 1-2 min,adding an appropriate amount of AgNO_(3) solution to remove impurities such as CO_(3)^(2-),HCO_(3)^(-),fCO_(2)(free carbon dioxide),and Cl^(-)in the water sample,and minimize the mass spectrometry interference caused by multi atomic ions of C and Cl when measuring on the machine,and reducing the mass spectrometry interference caused by C and Cl polyatomic ions as much as possible during instrumental determination.The mass concentration of 52Cr and 51V had good linear relationship with the signal intensity in the range of 0-100 and 0-50μg/L,respectively.The correlation coefficients were 0.9998 and 0.9999,respectively.The detection limits were 0.085 and 0.044μg/L,respectively.The average recoveries of the samples were 97.68%-103.17%,and the relative standard deviation of the determination results was less than 5.0%(n=11).The method has low detection limit,high accuracy and good repeatability,which can meet the accurate determination of trace Cr and V in various natural water samples.

关 键 词：电感耦合等离子体质谱法 铬和钒 天然水体 

分 类 号：O657.6[理学—分析化学]