Abstract
A new procedure for the direct determination of total arsenic in high salinity and CaCl2 type groundwater has been developed.In order to remove the polyatomic interferences40Ar35Cl+,40Ca35Cl+,39K36Ar+arising from the direct analysis of high salinity and CaCl2type groundwater,75As+,the mass for general detection,was effectively changed to75As16O+which could be detected at m/z 91 by reaction with oxygen in a Dynamic Reaction Cell( DRC).The DRC parameters were optimized,the background equivalent concentration( BEC) was minimum when O2gas flow rate was 0.1 mL/min and the rejection parameter q( RPq) of DRC was 0.55.The signal intensity of75As16O+was improved 4-fold by addition of 3% methanol into sample solution.The accuracy was verified by the analysis of certified reference materials of sea-water( CASS-5,NASS-4).Detection limits of 0.011 μg/L and the relative standard deviation of 1.8% were obtained.
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