Sandimirov S.S. Chemical Composition of Bottom Sedimentary Deposits in Lakes in the Zone Impacted by Atmospheric Emissions from Severonickel Plant. Geochemistry International. 2010, Vol. 48, №11, p. 1148-1153.

CHEMICAL COMPOSITION OF BOTTOM SEDIMENTARY DEPOSITS IN LAKES 1149 <D 13 £ 15 о « 2 0 5 - о 10 ft <D 13 £ 15 о § 2 0 Ni, ppm 1000 2000 50 Zn, ppm/g 100 150 200 Pb, ppm/g 10 20 20 250 1 5 - о 10 ft <D 13 £ 15 о § 2 0 40 Cu, ppm 400 800 1200 40 80 120 Cd, ppm/g 0.4 0.8 0.4 1.4 Fig. 1. Vertical distribution of concentrations (ppm per dry residue) of the predom inant trace-element contam inants in the BD of the lakes. abinsk oblast, Southern Urals, which has been in operation since 1910, induced an increase in the Ni concentration from 43 ppm in background layers at depths of more than 1 m to 87 ppm in the uppermost layer (0—1cm) of the BD of Siritkul’ Lake at a distance of 8 km from the smelter [12]. The maximum Ni con­ centration of158 ppm was detected in the depth range of 14—18 cm of the BD. The surface layer of BD of Macfarlane mesotrophic lake, whose water has a neu­ tral pH and which is located in the zone of atmosphere pollution by a similar smelter at Sudbury, Canada, bears an Ni concentration similar to those in Moncheozero and Malevoe lakes: approximately 1500 ppm [13]. The maximum values of the Cu contamination coefficient were detected in Malevoe Lake, and the minimum values were encountered in Moncheozero lake (table, figure). Malevoe Lake had the highest Cu concentrations in the water (79—190 ^g/l) when the Monchegorsk area was monitored [3] and on the day when the BD of the lake were sampled (126 ppm). 0 0 5 0 0 GEOCHEMISTRY INTERNATIONAL Vol. 48 No. 11 2010