Cadmium and Arsenic Pose Health Risk in Shellfish from Major Chinese Market

A comprehensive assessment of shellfish from Zhoushan, China's foremost seafood base, has revealed potential health risks from heavy metal contamination. Researchers analysed 90 samples across six commercially important shellfish species, measuring the concentration of seven different elements, including lead, cadmium, and arsenic.

The findings showed a varied level of contamination. While most metals were within international safety standards, cadmium (Cd) frequently breached the limit, being found in excess in nearly 28% of all samples. This highlights a specific area of concern within the broader seafood supply.

From a health perspective, the study indicated that the risks from inorganic arsenic (iAs) and cadmium exceeded the acceptable carcinogenic risk threshold for both adults and children. One species in particular, S. constricta, contained levels of these metals that surpassed recommended daily and monthly consumption limits.

The study traced the contaminants to distinct origins, including industrial, agricultural, and natural sources. Although Zhoushan's marine environment is currently within safe operational limits, the results emphasise the necessity for ongoing surveillance to protect public health.