Sandimirov S.S. Catalogue of lakes in the Russian, Finnish and Norwegian Border Area. Finland, Jyvaskyla: Kopijyva Oy, 2008.

water in the lake is colourless. The summer military training ground of the settlement of Luostari is situated on the lake shore. Boulder beds occur in almost all parts of the littoral zone, and extend down to a depth of about 2-2.5 m. The gaps between the boulders are filled with silt, sand and pebbles. 1.11.1. Hydrochemistry The water of the lake is close to neutral and has low total mineralization values (average 15.8 mg/l) and alkalinity (aver­ age 53 |ieq/l). The lake is characterized by low concentrations of base cations and anions, sodium (average 2.49 mg/l) and sulphate (average 3.8 mg/l) predominating. Based on the concentrations of min­ eral nutrients, the lake is classified as oli- gotrophic. The concentration of total P is 10 |ig/l and of total N 163 [ig/1. The lake also has colour values, organic mat­ ter concentration (6.0 mg/l) and mean Fe concentration (201 (ig/1) typical of small water bodies in the region. Dur­ ing episodes of high precipitation in the summer the concentrations of species of mineral nutrients (P 0 43‘ and N 0 3~) that determine the lake productivity are low. The water exchange index, which de­ termines the concentration of mineral nutrients in the lake is 3.8, i.e. full water exchange in the lake takes about three and a half years. The watershed of Lake Pikku-Hey- njajarvi is subjected to severe anthropo­ genic impacts from the “Pechenganikel” smelter. The main pollutants are sulphur compounds and heavy metals (Ni. Cu, Co, etc.). In spite of the fact that emis­ sions from the smelter have been re­ duced to approximately one third of the peak levels in the late 1970s, the deposi­ tion of pollutants still has an impact on the water body. The concentrations of Cu (up to 4.3 (ig/1) and Ni (up to 14.8 |ig/l) are higher than in other parts of the region. Hydrochemical properties pH 6.55 6.54-6.55 Electrical conductivity, mS/cm 29 28-29 Ca, mg/l 1.39 1.37-1.41 Mg, mg/l 0.76 0.76-0.76 Na, mg/l 2.49 2.47-2.52 K, mg/l 0.32 0.31-0.33 HC03, mg/l 33 3.2-3.3 S04, mg/l 3.85 3.85-3.85 Cl, mg/l M 3.6-3.7 Total mineralization, mg/l 15.8 15.7-15.8 Alkalinity, peq/l 54 53-54 Water colour, deg. 21 26-27 NH4, (ig/1 8 7-10 N03, мд/І 1 1-1 Total N, мд/І 159 155-163 P04, цд/І 1 1-1 Total P, цд/І 9 8-10 Fe, мд/І 201 197-206 Cu, цд/І 4J_ 4.0-4.3 Ni, мд/і 14.5 14.2-14.8 Ai, мд/і 76 72-81 Pb, цд/І 0.18 0.15-0.21 Catalogue ofLakes in the Russian, Finnish and Norwegian BorderArea