QC/QA scheme applied for monitoring of metals concentrations in water intended for human consumption sampled from the area of Warsaw performed by ICP-MS and ICP-OES techniques

摘要

Monitoring of metals concentrations in water intended for human consumption sampled from the area of Warsaw was performed within DWM/N176/COST/2008 project financed by Polish Ministry of Science and Higher Education. Several metals which are listed in EU Directive 98/83/EC (Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb) and additionally Zn were determined in 100 tap water samples collected from the area of Warsaw. The part of Warsaw supplied in drinking water by Central Water Supply System was chosen as control area. Random Day Time (RDT) monitoring based on taking 1 l of water directly from the tap used for consumption water drawing at a time randomly chosen within the day during normal office hours was applied for collection of tap water samples. For the determination of Al, As, Cd, Ni and Pb ICP-MS was applied while for the determination of rest of metals ICP-OES was used. During determinations of elements by ICP-MS and ICP-OES QA/QC applied scheme included:maintenance of optimal performance of spectral measurements, calibration control, procedural and on-field blanks levels control, precision control for analysis of double samples, check sample and certified reference material control. Appropriate control charts were prepared in order to assure of adequate quality control for achieved analytical results. Additionally Laboratory of Physicochemical Analysis of the Environment has participated in interlaboratory comparison organized by Technical University of Cracow (April 2010).