Simultaneous Determination of Different Forms of Arsenic,Chromium,and Mercury in Surface Water by Ion Chromatography with Inductively Coupled Plasma Mass Spectrometry
A method is established for the simultaneous determination of eight forms of three elements,including arsenic,chromium,and mercury,in surface water using ion chromatography with inductively coupled plasma mass spectrometry.After filtering the surface water sample through a water phase filter membrane,a GIST C8(250 mm×4.6 mm,5 μ m)chromatographic column is used,with 0.01 mol/L tetrabutylammonium hydroxide+0.05%L-cysteine+4%methanol as the eluent(pH 6.0,flow rate 0.9 mL/min).After separation,the sample is analyzed.The results show that trivalent arsenic,dimethyl arsenic,monomethyl arsenic,pentavalent arsenic,inorganic mercury,methylmercury,ethyl mercury,and hexavalent chromium can be effectively separated within 10 minutes.The detection limits for arsenic,chromium,and mercury are 0.075-0.15,0.86,0.000 10-0.020 μg/L,respectively,with spiked recovery rates of 88.8%to 108.3%,84.9%,87.7%to 96.0%,and relative standard deviations of 1.41%to 4.02%,1.82%,0.43%to 2.17%,respectively.Using this method to detect surface water samples can meet the standard limits and detection requirements for surface water.
ion chromatographyinductively coupled plasma mass spectrometrysurface waterchromiumarsenicmercuryelemental form
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