The measurement and calculation of zinc content in zinc sulfate

Rech Chemical Co., LTD generally supplies our customers with 33% zinc sulfate monohydrate and 21.5% zinc sulfate heptahydrate. We often receive some customers’ inquiry how does the zinc content come out?

The content of zinc in zinc materials is measured and calculated in EDTA coordination titration method. The main theory is that zinc sulfate solution is added with ammonium fluoride and potassium iodide (It may be added Oxidation hydrogen oxidation to remove ferric iron impurities and the interference to zinc content). Under PH 5~6 conditions, the solution is titrated with Ethylene Diamine Tetraacetic Acid. It’s indicated by xylenol orange that the color changes from magenta to lemon yellow.

At last, we can get the zinc content of zinc sulfate through EDTA standard titration measurement and quality score (%).