高分辨率单道扫描型电感耦合等离子体原子发射光谱法测定高合金钢中铝

Determination of aluminum in high-alloy steel by high-resolution sequential inductively coupled plasma atomic emission spectrometry

在测定基体复杂的高合金钢中铝含量时,采用Al 308.215nm或Al 394.401nm作为分析谱线,无需使用复杂前处理方法及干扰因子校正模式,使用高分辨率单道扫描型电感耦合等离子体原子发射光谱仪(ICP-AES)对铬、镍质量分数小于20%,铜、锰、钨、钴质量分数小于5%,钼质量分数小于4%的高合金钢中微量铝进行测定。并与普通分辨率全谱电感耦合等离子体原子发射光谱仪测定高合金钢中铝的方法在光谱干扰方面的情况进行了比对。结果表明:方法中铝的测定下限为0.002%(质量分数);校准曲线采用基体匹配法消除基体效应的影响,线性相关系数达0.999 9以上。按照实验方法测定高合金钢样品中铝含量,结果的相对标准偏差(RSD,n=9)不大于6.2%;标准样品中铝的测定结果与认定值相符。

During the determination of aluminum content in high-alloy steel with complex matrix,Al308.215 nm or Al 394.401 nm was selected as the analytical line.Without the use of complicated pretreatment method and interference factor correction mode,the content of trace aluminum in high-alloy steel(the mass fraction of chromium and nickel was less than 20%;the mass fraction of copper,manganese,tungsten and cobalt was less than 5%;the mass fraction of molybdenum was less than 4%)was determined by high-resolution sequential inductively coupled plasma atomic emission spectrometry(ICP-AES).Moreover,the spectral interference of proposed method was compared with the whole spectrum inductively coupled plasma atomic emission spectrometry with normal resolution.The results showed that the low limit of determination of aluminum was 0.002%(mass fraction).The matrix effect could be eliminated by the calibration curve with matrix matching.The linear correlation coefficient was higher than 0.999 9.The content of aluminum in high-alloy steel sample was determined according to the experimental method.The relative standard deviations(RSD,n=9)were less than 6.2%.The found results of standard samples were consistent with the certified values.