Effective chlorine analysis

Sodium sulfite is a reducing agent that can reduce chlorine gas to chloride ions in water. When sodium sulfite is present in saltwater, and chlorine is also present, sodium sulfite reduces chlorine and converts it into chlorides. Therefore, even if an excessive amount of sodium sulfite is added to the saline solution, the presence of chlorides can still be detected through effective chlorine analysis. .

Was the excess of sodium sulfite determined through analytical testing, or was it determined by adding an amount greater than the theoretical required amount? What you’re describing seems to refer to the analysis of free chlorine. Firstly, it is essential to measure the free chlorine level in the brine used in chlor-alkali production, ensuring that its level is 0 in order to protect the resin in the resin tower. It’s not clear at present what the purpose of testing for sodium sulfite is; perhaps it is done to determine the extent of the excess, thereby reducing the amount of sodium sulfite used. However, continuing to test for free chlorine even when there is an excess of sodium sulfite seems similar to measuring calcium and magnesium levels despite knowing that there is an excess of these substances as well. The accuracy of the tests and whether the reactions occur completely need to be verified through analytical results.