Assessment of Surface Water Quality of Upper Basin of Lapus River (Romania) Postmining Closure Operation

Giana Popa, Tania Mihaiescu, Antonia Odagiu, Radu Mihăiescu, Claudia Balint

Abstract


Presently, the water resources of the planet are strongly affected by anthropic impacts so that their protection has become a major problem of humanity. The main purpose of this study is to assess the chemical status trend of the water body Lapus River - "Izvoare - Suciu and the tributaries", analyzing the section between the Izvorul Alb-Negru (the reference) section and the Lapusul Romanesc section which captures the significant impact of mining activity in Baiut metallogenic area. Although, since 2007 mining activities ceased in this area, and measures to contain the pollution were applied, the recovery of the affected environment is still slowly progressing. For the assessment of pollution with heavy metals it was calculated the Heavy metal pollution index (HPI) using weighted arithmetic mean method. The metals such as cadmium (Cd), lead (Pb), and nickel (Ni) were considered. The metal concentrations showed a dominance in the order of Cd > Pb > Ni, respectively. The value of HPI for the Lapusul Romanesc section was found to be much over the critical pollution index value of 100. The important information has been gained from this analysis, especially on the identification of significant temporal and spatial trends of water quality parameters and the status of river water quality according to the water quality standards. Its chemical state risks not reaching the target of the Water Framework Directive and constitutes an exception to the general good status of the river.


Keywords


surface water, heavy metal pollution index, water quality, water quality standards.

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