Analysis on the results of proficiency testing program of hexavalent chromium in soil
The leading laboratory organized Proficiency Testing Program of hexavalent chromium in soil in Shandong Province,and 274 laboratories participated.The quartile analysis method in robust statistics is used to analyze the reported data of each laboratory,and the test level of each participating laboratory is objectively described by the Z-ratio score of the deviation from the median value.The results showed that a total of 257 laboratories verified the results as satisfactory,with a satisfaction rate of 93.8％.According to the verification results,each laboratory can combine the original records to ana-lyze the existing detection technical problems and improve its soil detection ability.
万方数据
维普
