Desi traducerea exacta include "chemical", am obsevat ca numai in in documentele traduse din alte limbi "chemical" este inclus. Incearca Google in ambele variante si vei vedea despre ce vorbesc.

The possibility of concentration of microquantities of heavy metals using the coprecipitation method has been demonstrated. 8- Mercaptoquinoline oxidation product -8,8’-diquinolyl disulfide has been used as the coprecipitating agent. Using the proposed method such metals as Cu, Ag, Zn, Cd, Hg, Ga, In, Tl, Sn, Pb, As, Sb, Bi, V, Se, Cr, Mo, Fe, Co, Ni were concentrated from the natural waters. Content of heavy metals in the concentrates can be determined by the spectral atom absorption or neutron activation analysis methods

--------------------------------------------------
Note added at 2002-06-30 22:11:47 (GMT)
--------------------------------------------------

Cred ca explicatia mea nu a fost indeajuns de clara. \"Coprecipitation\", \"coprecipitate\" sunt folosite numai in chimie si de aceea \"chemical\" devine superfluu.

--------------------------------------------------
Note added at 2002-07-01 01:31:48 (GMT)
--------------------------------------------------

Webster\'s Encyclopedic:

coprecipitate, v. (coprecipitation n.) = Chem. - v.t. 1. to cause to precipitate together. - v.i. 2. to precipitate together in the same reaction [1930-35 co + precipitate]