Heavy metal content of sediments in the Calcasieu River/Lake Complex, Louisiana

Abstract

The heavy metals Cd, Cr, Cu, Pb, Hg, Ag, and Zn, and the metalloid As were measured in surface sediments at permanent stations located in the Calcasieu River/Lake Complex . The relationships among metal concentrations in different areas of the system were investigated to determine sources, source strength, and transport . The point-source inputs of heavy metals were assumed to be industrial outfalls (Bayou d'Inde) and sewage outfalls (Bayou d'Inde and Contraband Bayou) . Although these inputs have not seriously affected the entire river/lake system, stressed regions exist within each bayou .The background levels of arsenic and heavy metals were : 0 .60 (As), 0.3 to 1 .4 (Cd), 25 (Cr), 10 (Cu), 15 (Pb), < 0.05 (Hg), 0.07 (Ag), and 40 mg kg-' (Zn) . Stations near sewage outfalls and industrial outfalls had increased metal concentrations above these background levels, but the increases were restricted to the regions near the outfalls . The metals discharged into the bayous were not being transported to the remainder of the river/lake complex .

<b>CONCENTRATION LEVELS OF TRACE METALS IN FISH AND SEDIMENT FROM KUBANNI RIVER, NORTHERN NIGERIA</b>

“…The data obtained shows that the trend of occurrence of the trace metals in the river sediments was: Zn > Cu > Cr > Ni > Pb > Cd. The values got in this study for these metals were higher than the corresponding values for Tyume River [17] and Calcasieu River/Lake [18]. However, the levels of Pb and Zn reported by Ellaway et al [19] for sediments of Yarra River/Estuary (Australia) were higher than the corresponding Kubanni River values.…”

Evaluation of Contaminated Sediments by Toxicity Characteristic Leaching Procedure Extraction Techniques

“…This result is in agreement with the previously reported localized nature of the contamination within the bayou (1). A study of the chemical speciation of metals bound to sediments collected in southwest Louisiana has shown that Ͼ90% of Cu, 80% of Cr, 60% of Pb, and 60% of Zn are bound to organic and residual binding sites (13,14).…”

“…Since the early 1940s, this bayou has been used to receive industrial and municipal outfalls and is locally infamous for its level of contamination (1)(2)(3)(4)(5)(6). Since this study was attempting to determine if metals bound to sediments could be extracted by weak natural inorganic and organic acids, the U.S. EPA TCLP method (7) was designed to provide an extraction procedure that would prove whether extracted metals (or organics) would exceed the primary drinking water standards for Maximum Contaminant Levels (MCLs) (12).…”

“…Bayou d'Inde is a major tributary of the Calcasieu River that meanders through the industrial complex and has been reported to be severely contaminated with industrial waste (1)(2)(3). Studies (4 -6) have shown that areas near the industrial complex and urban areas have been contaminated, with the bulk of the contamination isolated within Bayou d'Inde.…”

Heavy Metal Concentrations on Umurbey River Sediment, West Anatolia

“…Greenhouse activity is important in agricultural production. Global environmental issues, is deeply thoughtful and reflective as to how environmental science might be deployed in environmental management [12][13][14][15][16][17][18][19][20][21].…”