【摘要】 目的 为了保证实验室检验结果的准确性，参加生活饮用水中镉的能力验证，并对考核结果进行分析及经验探讨，研究了测定生活饮用水中镉的能力验证过程中的质量控制，以提高实验室检测能力。方法 运用电感耦合等离子体质谱法测定生活饮用水中镉能力验证考核样品，从仪器设备、样品的保存及仪器参数的优化、标准溶液的核查、样品分析和数据处理等方面对实验进行了质量控制，能力验证组织方采用Z值评定的方法对参加实验室的测试结果进行统计分析并判定。结果 镉质量浓度在0.001 mg/L～0.050 mg/L时与响应值呈良好线性关系，相关系数为0.999 8,样品1和样品2的Z值分别为0和-0.14,评价为结果满意。结论 此方法快速简便，线性良好，准确性高。在生活饮用水中镉检测能力活动中所采取的质量控制措施能够有效保证检测结果的准确性。更多还原

【Abstract】 Objective In order to ensure the accuracy of laboratory test results and improve laboratory testing ability, cadmium in drinking water was determined to analyze the test results, to conduct experience discussion, and to study the quality control of cadmium testing in the proficiency verification process in drinking water. Methods Inductively coupled plasma mass spectrometry(ICP-MS) was used to determine the cadmium in drinking water. The quality control was carried out from the aspects of instrument and equipment, sample preservation, optimization of instrument parameters, verification of standard solution, sample analysis and data processing. The competency verification organization used the Z-value evaluation method to conduct statistical analysis and judgment on the test results of the participating laboratories. Results Good linearity was observed when cadmium was within the concentration of 0.001 mg/L-0.050 mg/L, the correlation coefficient(r) was 0.999 8. The Z values of sample 1 and sample 2 were 0 and-0.14, which indicated that the results were satisfactory. Conclusion This method is rapid, simple and accurate. The quality control measures adopted in the activities of cadmium determination in drinking water can effectively ensure the accuracy of determination results.更多还原