葡萄酒中铜、铁含量检测的能力验证研究

Proficiency testing of detection of Cu and Fe in wine

目的通过能力验证计划,对国内检测实验室的葡萄酒中铜、铁含量检测能力进行分析和评价。方法能力验证计划中使用的被测样品采用被重金属污染的红葡萄酒,通过单因子方差分析法和t检验法分别对其进行均匀性测试和稳定性测试。将各参加实验室提交的结果进行稳健统计,计算中位值作为测试样品重金属含量的指定值,标准化四分位间距作为此次能力验证的标准差。采用Z比分数评定各参加实验室的测试结果。结果共有24家实验室在规定时间内报送铜含量有效检测结果,其中22家实验室结果满意,2家实验室结果不满意。共有20家实验室在规定时间内报送有铁含量有效检测结果,20家实验室结果均满意。结论能力验证的统计结果表明,国内检测实验室的葡萄酒中铜、铁的检测能力总体较好。

Objective To evaluate the capacity of domestic laboratories for determination of Cu and Fe in wine by proficiency testing program. Methods Sample used in the proficiency testing program was heavy metals contaminated red wine. The homogeneity and stability of the sample were tested by single factor variance analysis and t test. The results provided by participant laboratories were analyzed by robust statistics. The median value of the results from participating laboratories was recognized as the reference value of heavy metal concentration of the tested sample, and the interquartile range was the standard deviation. The test results of each participating laboratory were assessed by the Z-score. Results Twenty four laboratories delivered valid results of Cu on time with 22 satisfied results and 2 unsatisfied results. Similarly, 20 laboratories delivered valid results of Fe on time and all results were satisfactory. Conclusion The capacity of domestic laboratories for determination of Cu and Fe in wine is good according to the statistics results of the proficiency testing program.