Indeed, more recent assessments of the levels of heavy metals in Russian rivers have concluded a decreasing trend in mercury concentrations [ 6 , 9 , 10 , 78 ] along with permissible levels in soil [ 79 ].
1
—
—
Indeed, more recent assessments of the levels of heavy metals in Russian rivers have concluded a decreasing trend in mercury concentrations [ 6 , 9 , 10 , 78 ] along with permissible levels in soil [ 79 ].