冷等离子体激光剥蚀电感耦合等离子体质谱法测定钢铁中14种元素

Determination of fourteen elements in iron and steel by cool plasma laser ablation inductively coupled plasma mass spectrometry

采用冷等离子体模式,以57Fe为内标,建立了单点激光剥蚀电感耦合等离子体质谱法（LA-ICP-MS）测定钢铁材料中各元素的方法.氧化铝砂纸进行样品表面处理会引入玷污;样品表面粗糙度对结果影响不大;除钛外,样品直径对结果影响不明显;砷、锡的分馏因子（FI）分别为0.85和0.83,有分馏效应,其他元素的FI在0.93～1.05之间,没有分馏效应;采用不同系列标准物质进行曲线拟合,除硅、磷、硫外,其他元素的相关系数都大于0.95,基体效应不明显;方法能实现用34 S测定硫,但不能测定碳.建立了测定低合金钢及其钢丝中铝、硅、磷、硫、钛、钒、铬、锰、钴、镍、铜、砷、钼和锡等元素的方法,标准物质的测定值与认定值基本吻合;精密度考察发现,各元素的RSD（n=5）为0.7％～8.7％（钛的RSD达17％）.方法还适用于其他钢铁材料中钒、铬、锰、钴、镍、钼和锡等元素的测定,有实际应用价值.

With cool plasma model,with 57Fe as internal standard,a determination method for the elements in iron and steel materials by single point laser ablation inductively coupled plasma mass spectrometry （LA-ICP-MS） was established.Abrasive paper made of aluminium oxide,when used for surface processing,could introduce pollution; the surface roughness of the samples didn＇t affect the experimental results; except Ti,the sample diameter showed no obvious effect on the experimental results; the fractionation indexes （FI） of As and Sn were 0.85 and 0.83,respectively and exerted fractionation effect,while other elements,whose FI was in the range of 0.93-1.05,showed no fractionation effect; different series of certified reference materials were used for curve fitting,and except Si,P and S,other elements all had relative coefficients higher than 0.95,without any obvious matrix effect.34S could be used in the determination of sulfur but not that of carbon.A method was established for the determination of A1,Si,P,S,Ti,V,Cr,Mn,Co,Ni,Cu,As,Mo and Sn in low alloy steel and steel wire,the measurements of the certified reference materials being consistent with the certified values,RSD （n=5） for each elements was in the range of 0.7％-8.7％ （RSD of Ti exceeding 17％）.The method is also applicable to the determination of V,Cr,Mn,Co,Ni,Mo and Sn in other steel materials and thus has practical importance.