Quick Removal of Heavy Metals from Acaudina molpadioides

Abstract:

The study aimed to combine the citric acid soaking with puncture，vacuum pumping and sub-immersion to shorten the time for the removing of heavy metals from Acaudina molpadioides. Results showed that the combination of puncture and sub immersion resulted in a quick removal of heavy metals with removal rates of 88.71% and 90.69% for Pb and As and the contents of Pb，As，Cr and Cd meeting the limit requirements in GB 2762 at the immersion up to 12 h. The combination of vacuum and sub immersion could also quickly removed heavy metals and when the immersion time reached 12 h，the removal rates of Pb and As were 86.93% and 86.13%，respectively，and the contents of heavy metals were also within the limits.