火花源原子发射光谱法测定钢中超低碳、氮、磷和硫

Determination of ultra-low carbon,nitrogen,phosphorus and sulfur in steel by spark source atomic emission spectrometry

研究了火花源原子发射光谱法测定钢中超低碳,氮,磷和硫。对样品的处理方法、氩气的纯度和流量等影响因素进行了探讨。通过共存元素的干扰校正,改善了校准曲线拟合线性关系和试样点的离散度。测定了C,N,P和S的检出限分别为2.986,2.403,0.368,0.552μg/g,背景等效浓度分别为274.51,168.88,13.19,18.80μg/g。对于小于30μg/g的C,N,P和S,测定的相对标准偏差分别为7.79%,18.95%,2.32%和2.70%。类型校正的使用,消除了系统误差,类型校正后的结果与化学法相吻合。

A method for determination of ultra-low carbon, nitrogen,phosphorus and sulfur in steel by spark source atomic emission spectrometry was studied. The preparation method of sample, the purity and flow rate of argon, which might affect the precision and accuracy of the results ,were discussed. The fitted linear relationship of the calibration curve and the dispersion of sample points were improved through interference correction of coexistence elements. The detection limits of C, N, P and S were 2.986, 2.403, 0.368 and 0.552μg/g respectively, and the background equivalent concentrations were 274.51, 168.88, 13.19 and 18.80μg/g. Determining the samples containing less than 30μg/g of C, N, P and S, the relative standard deviations were 7. 79%, 18.95%, 2.32% and 2.70%, respec-tively. The systematic errors were eliminated after type correction, and the results obtained after correction agreed with those by chemical methods.