Once all risks were examined, the main concern related to human health was inorganic arsenic. Based on a recommendation from ATSDR, follow-up sampling and analysis was conducted on Dungeness crab. ATSDR recognized that children are more likely to eat a lot of crab than butter clams or other species. The question was whether children could be exposed to unsafe levels of inorganic arsenic by eating Dungeness crab, so the Study Team collected a representative sample of crab and analyzed it for arsenic forms.
This graph show the results of analyzing crab muscle (meat) for the three locations sampled. The Hospital Beach and Tamgas Harbor sampling areas were selected for additional sampling, because these are areas where a large portion of the Community’s crabs are caught. Crab Bay was once again included to provide reference samples.
The results for the total arsenic levels are similar to those previously detected in butter clams. Inorganic arsenic was not detected. The detection level for this analysis was about 0.017 ppm, or 17 ppb.
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