Arsenic Table marine organisms

Table 3.8 lists the arsenic concentrations of different types of marine and estuary sediments from various locations. Overall, low organic-carbon carbonate muds, oxidizing sands, and coarser-grained sediments have relatively little arsenic. In contrast, reducing marine sediments may contain as much as 3000 mg kg-1 of arsenic (Mandal and Suzuki, 2002), 202. Arsenic also tends to be enriched in fine-grained silicate-rich sediments, such as deep-sea clays and marine muds. In most cases, arsenic-rich sediments contain abundant arsenic-accumulating (oxy)(hydr)oxides, organic matter, or sulfides. 

The dominant organoarsenic compounds in aquatic systems are (CHj) 3AS CH2. COO (arsenobetaine) and (CH3)3AS CH2CH20H (arsenocholine). The arsenic concentration of hsh and marine invertebrates differs widely depending on the species and the organ under consideration (Table 1). 

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