Accumulation and transformation of arsenic in the tissues of Procambarusclarkii under different exposure conditions
Arsenic(As)can accumulate and transform in the aquatic food chain and affect human health through the food chain.The crayfish(Procambarusclarkii),an omnivore living in freshwater substrates,is capable of absorbing and transforming inorganic arsenic from water and food.In this study,we investigated the bioaccumulation and transformation of arsenate As(V)in different tissues of Procambarusclarkii under three different exposure conditions(aqueous phase,food phase,aqueous phase&food phase).The results showed that the arsenic accumulation concentration was higher in aqueous phase&food phase system,and the contribution of the aqueous phase exposure system to the total arsenic accumulation rate was greater than that of the food phase exposure system.The accumulation and transformation of arsenic in different tissues of Procambarusclarkii were significantly specific,with the following enrichment concentrations and accumulation rates:gill＞shell＞muscle.The biotransformation pathway of inorganic arsenic in Procambarusclarkii was the partial reduction of As(V)to As(Ⅲ)and partial conversion to monomethylarsenic acid(MMA),dimethylarsenic acid(DMA)and arsenic betaine(AsB).This is important for understanding the accumulation and transformation of arsenic in benthic biota and the food safety of crayfish.
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