[Determination of eleven elements in water-touched material by ICP-MS]

Water-touched material include water distribution equipment, protecting materials, and water treatment material. The security of the material plays an important role in everyone's daily life. So it' s necessary to determing metal elements in the material. A method for the determination of eleven elements, including Ag, As, Ba, Cd, Cu, Sb, Sn, Mn, Ni, Pb and Hg, in the water-touched material by inductively coupled plasma-mass spectrum (ICP-MS) is described. The plasma parameters were optimized as follows: The RF input power was 1350 W; flow rate of cooling gas was 13 L x min(-1); flow rate of assistant gas was 0.70 L x min(-1); flow rate of carrying gas was 0.8 L x min(-1); flow rate of atomization gas was 1.02 L x min(-1); rate of sampling was 1.48 mL x min(-1). The detection limits of these eleven elements were 0. 003-0.170 microg x L(-1). The relative standard deviations (n=6) were 0.6%-6.3%. The correlation coefficients were 0.9990-0.9996. The recoveries of the method were 92.4%-108.2%. This method is sensitive, accurate and simple compared with other methods, and has the advantage of wide linear range. The results were satisfactory.