Study on Removal Methods of Heavy Metals from Marine Freshwater Products

Abstract

Nowadays, Marine rivers are seriously polluted, and heavy metals such as arsenic, cadmium, mercury, lead, chromium and copper are absorbed by Marine freshwater organisms, seriously endangering human health. After boiling Marine river products such as scallop skirt into a concentrated liquid and adding sodium carbonate Na₂CO₃, most heavy metals will precipitate under strong alkaline conditions and be removed by filtration. But it doesn't work on tin Sn. Adding calcium hydroxide Ca(OH)₂, the heavy metal forms a precipitate under strong alkaline conditions. It’s filtered out. Citric acid or calcium citrate are strong chelating agents that can form chelating precipitates with heavy metals and be removed by filtration. The combination of the above two is better. Filtration loss can be reduced if hydrolysis is performed first!