Determination of Trace Metals in Drinking Water Using Solid-Phase Extraction Disks and X-ray Fluorescence Spectrometry:

摘要: A convenient method is described for monitoring Cd, Ni, Cu, and Pb at trace levels in drinking water samples. These metals are preconcentrated on a chelating solid-phase extraction disk then determined by X-ray fluorescence spectrometry. The tolerates wide pH range (pH 6-14) large amount of alkaline earth elements. preconcentration factor well over 1600, assuming 1 L sample volume. limits detection 3.8, 0.6, 0.4, 0.3 ng/mL, respectively. below the federal maximum contaminant level values, which 5, 100, 1300, 15 proposed has many advantages including ease operation, multielement capability, nondestructiveness, high sensitivity, relative cost efficiency. step can be conducted field disks mailed to laboratory analysis, eliminating transporting volumes Furthermore, color used provides an initial estimate degree contamination some transition (for example, Ni Cu). Thus, overall analysis minimized implementing method, small supply companies with limited budgets will better able comply Safe Drinking Water Act.