Minimization of interferences in inductively coupled plasma mass spectrometry using on-line preconcentration

摘要: A semiautomated system is used to preconcentrate Ti, V, Mn, Fe, Co, Ni, Cu, Cd, and Pb, in order remove high salt matrices. The preconcentration accepts digests with acid concentrations equivalent 0.8-1.4% HNO{sub 3}, neutralizes them, loads them onto a macroporous iminodiacetate resin. alkali alkaline-earth metals, along deleterious anions such as chloride, are washed off the resin before analyte metals eluted nitric acid. total of 13 isotopes analytes measured. An examination apparent concentration efficiencies, well behavior two internal standard elements added eluate stream, indicates that elution front matrix enhances inductively coupled plasma mass spectrometry response analytes. Investigation nature blank signal suggests detection limits several could benefit by much larger factors, while those vanadium, copper, cadmium, lead currently limited reagent purity laboratory contamination. evaluated on simple synthetic matrices, seawater three wastewaters. Digestion samples containing natural organic chelators required.