ESTONIAN ACADEMY
PUBLISHERS
eesti teaduste
akadeemia kirjastus
PUBLISHED
SINCE 1984
 
Oil Shale cover
Oil Shale
ISSN 1736-7492 (Electronic)
ISSN 0208-189X (Print)
Impact Factor (2022): 1.9
ENVIRONMENTAL IMPACT OF CLOSING OF OIL SHALE MINES ON RIVER WATER QUALITY IN NORTH-EASTERN ESTONIA; pp. 169–183
PDF | doi: 10.3176/oil.2009.2.09

Authors
A. SELBERG, M. VIIK, P. PALL, T. TENNO
Abstract

Chemical and biological characteristics of the Pühajõgi and Kunda catch­ments were determined in 1995, 2000 and 2005. During last ten years the concentration of total nitrogen in the samples of the river water from the Püha­jõgi catchment has decreased on the average almost 90% since four mines were closed. The concentrations of total nitrogen in the water samples of the Kunda catchment decreased on the average ca 20% during these ten years. The conductivity values of the river water samples of the Pühajõgi catchment between 800 and 1800 µS cm–1 indicated a significant amount of ionic species in the river water. The water was microbiologically unpolluted according to the results of the analysis in 2005.

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