FIELD: chemistry.
SUBSTANCE: method involves determination of the sum of the maximum allowable additive (MAA) of a metal/metalloid and background content thereof Cf, where content of heavy metal/metalloid and content of a reference element R in form of Zr and Ti is determined both in the epidedon A and the parent rock C, with subsequent determination of the local background content of heavy metal/metalloid Cf using the expression: Cf=MeC·RA:RC, where: MeC is content of metal/metalloid, RA is content of the reference element in the epidedon A, RC is content of reference element in the parent rock C, after which the local value of the approximate permissible concentration (APC) of heavy metal/metalloid is calculated using the expression: APC*=MAA+Cf.
EFFECT: high accuracy of analysis owing to separate calculation of the background content of the determined elements.
1 ex, 4 tbl, 1 dwg
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