Detection and analysis method of sulfate in salt water

What method was used to analyze it? That depends on the ability of the reagent you add to bind to sulfate, which is stronger than calcium sulfate.

Whether all sulfate radicals are measured has a lot to do with the measurement method. 1. Use barium salt precipitation method: Use barium chloride as the precipitant and measure sulfate in the form of barium sulfate. If the sample is fully stirred and aged, it can be considered that all sulfate is measured, because when there is a sufficient amount of barium ions, calcium sulfate will be converted into barium sulfate, which is more difficult to dissolve. 2. Fully dilute the sample and use ion chromatography to measure sulfate. If there is no solid matter in the diluted sample solution, it is all the sulfate that is measured. If there is suspended matter (incompletely dissolved sulfate), it is not all the sulfate. 3. Add sodium carbonate to pre-precipitate the calcium salt, and measure the sulfate radicals in the clear liquid, which is all the sulfate radicals measured. 4. Directly take a sample and filter it to analyze the sulfate in the clear liquid. It is mainly dissolved sulfate. ； The precipitate is then converted into the form of soluble sulfate, and the precipitated sulfate is measured.

It feels like what is analyzed is the sulfate radical of sodium sulfate. . . . . . . . . . . . It is estimated that after dilution, there will be trace amounts of sulfate radicals of calcium sulfate, which are also included in the sulfate radicals of sodium sulfate. . . . . .