NDLI: Geochemical Distribution of Selected Heavy Metals in Stream Sediments Affected by Tannery Activities

Content Provider	Springer Nature Link
Author	Rodrigues, Maria Lucia Kolowski Formoso, Milton Luiz Laquintinie
Copyright Year	2006
Abstract	This study describes the geochemical distribution and potential mobility of selected heavy metals in sediments affected by tanneries established in the Cadeia-Feitoria River basin, South Brazil. Surficial samples were taken at ten sites, in January 2000, during dry season. Metal contents were determined according to their association with main sediment phases by applying a sequential extraction scheme proposed by the ‘Community Bureau of Reference’ of the European Commission. In order to compare the results, total and partial extractions were performed, following analytical methods used by US EPA and US Geological Survey. Metals were analyzed in the silt/clay fraction, using inductively coupled plasma – optical emission spectrometry. The results indicate the following order of metal mobility: Ti (1%) < Al (5%) < Ni (6%) < Fe (10%) < Cu (20%) < Zn (28%) < Cr (49%) < Mn (76%). Manganese was highly mobile along the sampling sites, and mainly bound to exchangeable and reducible phases. Total Ti, Al, Fe, Cu, and Mn exceeded two or three times the average shale metal concentration, but generally reflected background conditions in the basin, where basalt rocks predominate. Ni and Zn were homogeneously distributed along the rivers, with concentrations comparable to the average shale and local concentration levels. Sediments affected by tanneries were enriched with chromium (geoaccumulation index = 2 and 3), preferentially associated to the oxidizable phase. The potential release of this metal and conversion to toxic forms seems closely related to the prevailing redox conditions. The relationship between data obtained from sequential extraction and from partial and total extractions are briefly discussed.
Starting Page	167
Ending Page	184
Page Count	18
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	169
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	heavy metals river sediments chromium speciation tanneries Brazil Hydrogeology Environment Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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