Final Report Report No.: 1 Program No.: WAT-CH-0001 Program ...

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Report No.: 1 Appendix C- Documents .....................................................................................................55 C-1- Instructions to participants .........................................................................................55 C-2- Results Sheet ...............................................................................................................57 Page 4 of 57
Report No.: 1 1. Introduction This report is a summary of the results of participating laboratories in proficiency testing program Physicochemical parameters in underground water round no. 1. The aim of this program is to enable laboratories to monitor and improve the quality of their routine analytical measurements, for the benefit of their customers. It also enables laboratories to demonstrate to customers, regulators and accreditation bodies the validity of their analytical measurements. Participation in PQP proficiency testing provides independent evidence of laboratory performance for both laboratory management and customers. This proficiency testing was performed by Pasargad Quality Pioneers (PQP) in November, 2012. The program coordinator was Ms. Bahar Hosseinzadeh. This report was authorized by Mr. Hamidreza Dehnad, PQP proficiency testing technical manager on December 1, 2012 Signature: 2- Test Materials 2-1- Preparation of samples The test material was prepared by East Azerbaijan Water & Wastewater Laboratory. The samples were taken from one of the underground sources of drinking water in Tabriz. The samples were stored at 4 °C until dispatch. 2-2- Samples homogeneity Ten randomly selected samples were analysed in duplicate for homogeneity by East Azerbaijan Water & Wastewater Laboratory. Based on the results of this testing, it was concluded that the samples were sufficiently homogeneous, therefore any results later identified as outliers could not be attributed to sample variability. The results of homogeneity testing have been summarized in Appendix B. 2-3- Samples Stability Three randomly selected samples were analysed in duplicate for stability by East Azerbaijan Water & Wastewater Laboratory at a date later than homogeneity testing according to the results submission deadline defined for the participants. Based on the results of this testing, it was concluded that the samples were sufficiently stable during the period of program execution, therefore any results later identified as outliers could not be attributed to sample instability. The results of stability testing have been summarized in Appendix B. 2-4- Distribution The dispatch date was November 4, 2012. Each laboratory received 2 x 1 L water samples together with a covering letter, participants instruction and a result sheet. 3- Statistical design of the program Participating laboratories were each supplied 2 x 1 L water samples labeled “Sample 1 & 2 (WAT-CH-0001)”. One result was reported for all tests. For each statistically analysed test, Page 5 of 57
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Final Report Report No.: 1 Program No.: WAT-CH-0001 Program ...

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