Why is there a lot of white precipitate formed when using spectrophotometry to analyze drilling wastewater?
Thread Content
Drilling wastewater contains large amounts of chloride ions, but they have been masked with mercury sulfate prior to digestion. After digestion, the solution is transparent with a white precipitate at the bottom. After centrifugation and transfer to a cuvette, a white precipitate forms, causing the solution to become turbid; after several hours, the precipitate settles at the bottom of the tube and the solution becomes clear again. Among them, the rinsing of the colorimetric tubes is carried out using water specifically designed for ICP-MS, which should be free of chloride ions. I hope the experts here can give me some advice!
It might be that the reaction isn’t complete; you can use an excess of the shielding material.