CV就是变异系数,在MATTEL的GILOP的关于ICP的标准叫7409中讲到, 2.5.2 Coefficient of Variation Determination 变异系数的测定 2.5.2.1 The Coefficient of Variation (CV) indicates the precision of the instrument's analyte emission intensity or concentration measurements. A high CV is usually indicative of a problem with the sample introduction system such as improper drainage, leaks, improper tension on the pump tubing, worn pump tubing, worn o-rings, or nebulizer problems. 变异系数(CV)表明该仪器的分析物的浓度或强度精密度。高的CV 通常是表 明进样系统的有问题,如排水不当、泄漏、泵管不正确的拉紧、泵管磨损、O 型圈磨损或雾化器问题。 2.5.2.2 The CV should be determined every three months. CV每三个月确定一次。 2.5.2.3 Measure the intensity of a 5% nitric acid blank solution. 测量5%硝酸空白溶液的强度。 2.5.2.4 Change the number of replicates in the instrument parameters from 2 to 10. 在此仪器参数下重复测试2-10次。 2.5.2.5 Measure the intensity of a 1.0 ppm Mn standard in 5% nitric acid. 测量基体为5%硝酸的1.0ppm Mn标准溶液的强度。 2.5.2.6 Record the CV as calculated by the instrument. The CV must not be greater than 1.00%. 记录仪器计算的CV值。CV不得大于1.00%。 2.5.2.7 If the CV is greater than 1.00%, check the sample introduction system, replace parts as needed and rerun the CV. 如果CV大于1.00%,检查进样系统,替换需要替换的部件和重新测试CV。 2.5.2.8 If the CV is still greater than 1.00%, notify a supervisor immediately and take the instrument out of service. 如果CV仍然大于1.00%,立即通知监管者和将仪器外修。 2.5.3 Daily Performance Check 日常运作核查