Arsenic species were quantified to further explore the biotransformation of arsenic and better explain the potential health risks. In this research, the levels of six arsenic species (AsB, AsC, MMA, DMA, As, and As) were determined in 160 squid samples by HPLC-ICP-MS. AsB was the most predominant speciation in squid tissues. The arsenic species, including AsB, AsC, and MMA, were found in all samples, followed by DMA (49.38%), As (21.25%), and As (2.5%). Results indicated squid samples from offshore had higher levels of AsB, AsC, MMA, and DMA. Pearson's correlation analysis found correlations between As-MMA, DMA-As, and AsB-MMA, which showed a clear methylation pathway. The levels of inorganic arsenic were below the standard, and no potential health risks were identified. Therefore, the application of total arsenic in our previous study to assess health risks may be biased. In future, there is a need to optimize food safety monitoring of arsenic and comprehensively grasp the basic status and change law of marine ecological environment.
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