Research on rapid determination of total bicarbonate and carbonate in CO2 absorption solution by EDTA indirect titration
Carbon capture,utilization and storage(CCUS)technology is one of the effective measures to reduce carbon dioxide(CO2)emissions,among which chemical absorption method is widely used and mature technology.In the chemical absorption method,after absorbing CO2 with alkaline solution,there is a certain amount of bicarbonate and carbonate in the CO2 absorption solution,and the total amount of bicarbonate and carbonate in the CO2 absorption solution can be determined accurately.According to the water quality components and complexity of desulfurization wastewater(using as CO2 absorption solution),EDTA indirect titration method was proposed to rapidly determine the total amount(measured in carbonate,the same as below)of bicarbonate and carbonate in CO2 absorption solution.The results of the determination of bicarbonate and carbonate series standard solutions show that the linear fitting coefficients of the standard curves of the series of standard solutions are greater than 0.9993,and the linear fitting range is from 100 mg/L to 2500 mg/L.Therefore,the detection range of the total amount of bicarbonate and carbonic acid by EDTA indirect titration is from 100 mg/L to 2500 mg/L.The results of actual engineering water samples show that the relative standard deviation of the measurement results is from 0.92%to 1.28%with n = 5,and the accuracy is good.The EDTA indirect titration method is feasible for the determination of bicarbonate and total carbonate.
CO2 chemical absorptionquantitative detectionindirect titrationdesulfurization waste water
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