Which chemical is commonly used for chrome reduction?

Sodium bisulfate is commonly used for chrome reduction due to its effectiveness in converting hexavalent chromium (Cr(VI)), which is highly toxic, into trivalent chromium (Cr(III)), which is less harmful and more stable. The reduction process generally involves the addition of sodium bisulfate to wastewater containing chromium. This chemical acts as a reducing agent, facilitating the conversion of the more harmful chromium species into a less hazardous form.

The use of sodium bisulfate is preferred because it not only helps in reducing the toxicity of chromium in wastewater but also aids in subsequent treatment processes, making it easier to remove the chromium from the water. The reduction from hexavalent to trivalent chromium is an essential step in ensuring compliance with environmental regulations and protecting aquatic life.