Phytoplankton and Its Role in Accumulation of Microelements in Bottom Deposits of Azov Sea

Table 4

Trace minerals in components of bottom deposits of the Azov Sea, %%.

Elements	Average content in bottom deposits, %	Content ratio
		organic substance; (mainly phytoplankton)	mollusc shell	terrigenous and authigenic components
Cr	0.007	0.4	0.2	99.4
Ni	0.006	2.6	0.9	96.5
V	0.01	5.1	0.2	94.7
Mn	0.025	3.1	17.6	79.3
Cu	0.001	4.5	21.9	73.6