Application of ion chromatography in the detection of water quality at primary laboratory
Objective To establish an ion chromatography method that can simultaneously measure disinfection by-products and anions in drinking water by direct injection of large volumes,and to explore its application effect in the detection of water quality at primary laboratory.Methods The gradient elution program,injection volume,and interference elimination of coexisting ions were optimized by optimizing the gradient elution program,injection volume,and interference elimination of coexisting ions in the potassium hydroxide(KOH)automatic leaching device,and the effective separation of 9 target substances of chlorate,chlorite,bromate,dichloroacetic acid,trichloroacetic acid,fluoride,nitrate nitrogen,sulfate and chloride.When the concentration of chloride ion and sulfate ion in water<50 mg/L,it could be directly determined;At>50 mg/L,the water sample could be injected through a Ba/Ag/H column to remove chloride and sulfate ions.At the same time,67 samples of municipal drinking water were tested.Results Five disinfection by-products and four anions were effectively separated within 43 minutes.The nine target compounds all had good linear relationships with their peak areas within the corresponding concentration ranges,with the correlation coefficients ranging from 0.999 2 to 0.999 9.The standard addition recoveries of water samples were 86.5%-107.0%,and the method detection limits were 0.4-4.0 μg/L.The detection rate of chlorate in water samples was 100%,and that of dichloroacetic acid was 70.1%.Trichloroacetic acid was not detected,and the detection rates of bromate and chlorite were relatively low,while the detection rates of the four anions were 100%.Conclusion The method is suitable for batch detection of drinking water and has strong practicability for the primary laboratories.
万方数据
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