Heavy metals content in water-bottom sediments system of the Prut river (Republic of Moldova)
Закрыть
Articolul precedent
Articolul urmator
642 1
Ultima descărcare din IBN:
2022-03-07 11:19
SM ISO690:2012
POSTOLACHI, Larisa, RUSU, Vasile, LUPASCU, Tudor, MITINA, Tatiana. Heavy metals content in water-bottom sediments system of the Prut river (Republic of Moldova). In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 170.
EXPORT metadate:
Google Scholar
Crossref
CERIF

DataCite
Dublin Core
The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova"
Chișinău, Moldova, 28-30 mai 2014

Heavy metals content in water-bottom sediments system of the Prut river (Republic of Moldova)


Pag. 170-170

Postolachi Larisa, Rusu Vasile, Lupascu Tudor, Mitina Tatiana
 
Institute of Chemistry of the Academy of Sciences of Moldova
 
Disponibil în IBN: 21 iunie 2020


Rezumat

Heavy metals are essentially for hydrobionts, while at high concentrations being toxic.
According to EU Directive (2006/11EC), due to their toxicity and bioacumulation, metals and
their compounds are introduced in the list of hazardous substances to the aquatic body [1].
Metals in natural waters are presented both in dissolved and suspended forms. The
proportion of these forms is varied for different metals and different water bodies. The toxicity
and sedimentary potential of heavy metals are changed depending on their forms [2].
The metals are presented in different phases of the water system, including abiotic and
biotic phases. As abiotic phases can be distinguished bottom sediments, their interstitial water,
particulate materials and water [3]. Of the three phases (water, particulate materials and
sediments), about 99% of the total content of metals is presented in sediments [4].
In order to identify the variation of heavy metals content, along the Prut River, the samples
were collected seasonally. For determination of the heavy metals content in the sediments
(freshly sampled), the extraction procedure recommended by the American Geological Agency
was used [5]. The content of heavy metals was determined by the flame atomic absorption
spectrometry.
During of 2009-2010 years, the increasing trend of Cu content in the water layer along the
Prut River has been established, while a higher content of Zn was identified in the middle sector.
In the most samples the content of heavy metals in interstitial water is exceeding their
concentrations in the water horizon. This demonstrates that the sediments can become a potential
source of the metals mobilization in water layer.
The content of heavy metals in the water layer did not exceed the allowable maximums set
by the EU [6], Romania [7], USA [8] and Canada [9]. The content of heavy metals in the
sediments, generally, did not exceed the quality requirements adopted in Romania [7]. However,
the content of Ni exceeded the threshold effect level for bottom sediments, according to the USA
[8] and Canada criteria [9].
References:
[1] Directive 2006/11/EC of the European Parliament and the Council of the 15th of February, 2006 on pollution
caused by certain dangerous substances discharged into the aquatic environment of the Community.
[2] Chapman, D.; Kimstach, V. Selection of water quality variables In: Water Quality Assessments - A Guide to Use
of Biota, Sediments and Water in Environmental Monitoring, 2nd Edition, Chapman D. (ed)
©UNESCO/WHO/UNEP, 1996.
[3] Salomons, W. Sediment pollution in the EEC © ECSC-EEC-EAEC, Brussels, 1993, 136p.
[4] Lee, S.; Moon, J.; Moon, H. In: Environmental Geochemistry and Health 2003, 25, p. 433–452.
[5] Techniques of water-resources investigations of the United States Geological Survey, Fishman M., Friedman L.
(Eds) Book 5, 3d edition, Washington, 1989, 545 p.
[6] Directive 2008/105/EC of the European parliament and of the Council of 16 December 2008 on environmental
quality standards in the field of water policy.
[7] Order 161/2006 of 16 February 2006 concerning the classification of surface water to determine the ecological
status of water bodies.
[8]. Öztürk, M. et. al. In: Iran. J. Environ. Health Sci. Eng. 2009, 6(2), p. 73–80.
[9] Osman, A.; Kloas, W. In: Journal of Environmental Protection. 2010, 1, p. 389–400.