Objective To study the content of lead and cadmium in market crayfish (Procambarus clarkii), and assess the amount of intake from dietary consumption of crayfish in Shanghai.
Methods Total of 75 crayfish samples were collected according to stratified random sampling, and the samples were determined by graphite furnace atomic absorption spectrometry. Crayfish consumption was assessed by questionnaire on dietary habit of crayfish among 600 local residents. Then, lead and cadmium intakes were assessed through dietary intake assessment model.
Results The average concentrations of lead and cadmium in crayfish body were 0.106 mg/kg and 0.009 mg/kg. The P90 of lead in wild crayfish in low stream season exceeded the Codex Alimentarius Commission(CAC)standard, which was much higher than that in cultural crayfish in high stream season. The P90 of cadmium in crayfish head exceeded the CAC standard, which was higher than content in body (P < 0.05). The mean weight of yearly crayfish consumption in the youth was 1.79 kg, which was higher than in adolecent and the elderly (P < 0.05). The means of weekly lead and cadmium intake due to taken crayfish were 0.122 μg/kg and 0.010 μg/kg, at 0.49% and 0.15% of PTWI (provisional tolerable weekly intake), respectively. The mean lead intake in adolecent and P90 in the youth ware 0.208 μg/kg and 1.43 μg/kg, at 0.83% and 1.43% of PTWI, respectively. The upper limit of lead and cadmium intake in the elderly were at 0.09% and 0.06% of PTWI.
Conclusion Lead intake due to crayfish consumption in adolecent and youth was high, which would be risky to health. Cadmium intake due to crayfish consumption was in safe level.
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