EVALUATION OF CHANGES IN CONTENT OF THE ELEMENTS (Fe, Zn, Mn, Cu, Co, Ni, Hg, Cd, Pb, As) IN THE BOTTOM SEDIMENTS IN THE AREA OF CULTIVATION OF THE SCALLOP PATINOPECTEN YESSOENSIS (PETER THE GREAT BAY, SEVERNAYA BAY)

Contents of heavy metals and arsenic were measured in bottom sediments under plantations of the marine farm in the Severnaya Bay in 2015–2017, using atomic-absorption spectrophotometer Shimadzu 6800 and mercury analyzer Milestone DMA-80. Indices of pollution C_f and C_dHM and the sediment quality guideline quotient (SQG-Q) are calculated. Dangerous As content is found: it exceeded the probable toxic dose (PTD) for one plantation in 2016–2017 and exceeded the probable effect level (PEL) for all plantations in 2017. Content of Cd was also high, though unstable — the Cd pollution could be caused by scallops metabolism because this species concentrates Cd in its tissues. Using the quantitative indices, pollution of the bottom sediments in the Severnaya Bay is evaluated as moderate toxic, able to make negative effect on marine organisms. The same elements contents in tissues of the cultivated scallop were measured, as well, in 2016. The dangerous content of Cd over the maximum permissible concentration allowed by the norms of the Custom Union Commission (2010) was detected for gills of adult (1+) scallop.

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