Trace metal determination in natural waters by automated solid phase extraction system and ICP-MS: the influence of low level Mg and Ca.
A fully automated high pressure pretreatment system with Nobias Chelate-PA1 resin (PA1) was developed for trace metal determination by ICP-MS in natural waters. By varying the concentrations of Mg and Ca to mimic the concentrations in the eluate obtained by PA1 or iminodiacetate type resins, the overall analytical performance of the system was assessed for the determination of Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Cd, Ag, Pb and REE. Comparing with the low mM level Mg and Ca (both ranging from 1 to 4mM) eluted by iminodiacetate type resins, the eluate obtained by PA1 contains sub-μM level Mg and Ca, which remarkably decrease matrix effect in ICP-MS analysis and significantly improve the analytical performance. With recovery better than 90% for most the trace metals examined, the accuracy was further verified through the analysis of five natural water reference materials with salinity spanning from 0 to 35‰. We have successfully applied the pretreatment system to determine trace metals in the seawater samples collected in the Western Philippine Sea through Taiwan GEOTRACES cruise.
['Wang|Bo-Shian|BS|', 'Lee|Chih-Ping|CP|', 'Ho|Tung-Yuan|TY|']
D002118:Calcium D002138:Calibration D008274:Magnesium D013058:Mass Spectrometry D008670:Metals D015203:Reproducibility of Results D012117:Resins, Synthetic D012623:Seawater D052616:Solid Phase Extraction D062066:Water Resources
Nobias Chelate-PA1 Matrix effect GEOTRACES Iminodiacetate resins Trace metal preconcentration