电感耦合等离子发射光谱法测定铁基粉末冶金中的钙元素

利用电感耦合等离子发射光谱法（ICP-OES）测定铁基粉末冶金中的钙元素.通过调整酸度配比和消除干扰因素，采用外标法定量消除基体效应的影响，同时共存元素的干扰校正试验表明，样品中共存元素对待测元素无干扰影响.通过对样品消解进行前处理优化，结果表明:在样品中加入王水后在电热板上加热，消解后滴加双氧水，使用ICP-OES测定，能获得良好的定量结果.在0.5~10 mg/L范围内具有较好的线性关系，其线性相关系数为0.999 9，方法精密度的RSD为0.14%（n=10），加标回收率为98%~105%.方法具有经济、快速、简单且重现性好等特点，可以满足日常分析检测要求.

Determination of Calcium in Iron-based Powder Metallurgy by Inductively Coupled Plasma Atomic Emission Spectrometry

A determination method of calcium in iron-based powder metallurgy has been established using inductively coupled plasma atomic emission spectrometry(ICP-OES). The acidity ratio and the interference of various factors were optimized. The external standard method was used to quantify and draw the calibration curve to eliminate the influence of the matrix effect, and the interference correction test of the coexisting elements showed that the coexisting elements in the sample has no interference effect on the element to be measured. A pretreatment of the sample was required by the sequential dissolution in aqua regia, heating on an electric heating plate, and followed by the further addition of H₂O₂. Good linearity was then obtained in the range of 0.5~10 mg/L with a correlation coefficiency of 0.999 9, a relative standard deviation of the instrument precision of 0.14% (n=10), and the recovery rate of standard addition in the range of 98%~105%. The method is economical, simple, rapid and reproducible, and can meet the requirements of the analysis and detection.