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Heavy metal (Pb, Cd, Zn, Cu) concentration in Red Blood Cockle (Anadara granosa) sold at local markets in Uttaradit Province, Thailand

The objectives of this study were to determine the concentration of heavy metals such as lead (Pb), cadmium (cd), zinc (Zn) and copper (Cu) in red blood cockles sold at local markets in Uttaradit province, Thailand. The red blood cockles were collected and randomly obtained from 5 local markets in Uttaradit province, Thailand-total 50 samples (10 samples from each local markets). The samples were analyzed using Atomic absorption spectrometry technique. The results showed that the average concentration of lead Pb was 0.5107±0.1039 mg/kg dry weight which does not exceed the specified standard. The average concentration of cadmium (Cd) was 0.7882±0.2535 mg/kg dry weight which does not exceed the specified standard, the average concentration of zinc (Zn) was 50.812±5.2684 mg/kg dry weight which does not exceed the specified standard and the average concentration of copper (Cu) was 4.593±0.6082 mg/kg dry weight which does not exceed the specified standard of the Thailand Food and Drug Administration of and that of the United States Food and Drug Administration.