Abstract:A method for rapid determination of carbonate and dissolved carbon dioxide in water samples with vapor generation by inductively coupled plasma atomic emission spectrometry（ICP-OES）was developed in this study.Improvements and design modifications were implemented for the gas injection method,incorporating an online carbon dioxide generation device. The method involved the acidification reaction of the test sample with dilute hydrochloric acid,generating carbon dioxide,and ICP atomic emission spectrometry was then utilized to determine the carbon content in the water samples. By optimizing the acid type selection,the optimal acid dosage,and the selection of various instrument parameters,a curve was established based on the relationship between the sample volume and the concentration of released carbon dioxide.This curve allowed the determination of carbonate and dissolved carbon dioxide content in the samples. The method exhibited linearity for carbon dioxide concentrations within 0-400 mg/L,with detection limits for carbonate and dissolved carbon dioxide at 0.021 mg/Land 0.077 mg/L. The recovery rates for spiked samples ranged from 98.75% to 107.15%,and precision fell within 3.31 to 5.78.This method is very effective for the determination of inorganic carbon in water,and has a good application significance in monitoring the change and flux of dissolved inorganic carbon in water and analyzing its source.