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|Title:||Histórico da contaminação em sedimentos do estuário do Rio Morrão (Cubatão-SP)|
|Keywords:||Contaminação; Indústria siderúrgica; Indústria de fertilizantes; Sedimento; Estuário rio Morrão; Contamination; Steel plant; Fertilizer industry; Sediment; Morrão river estuary|
|Abstract:||This study determined Hg, Ag, Al, Ca, Cd, Co, Fe, K, Li, Mn, P, Pb e Zn concentrations in a sediment core of the Morrão River, located at Santos-Cubatão Estuarine System, which is one of the most industrialized areas in Brazil, trying to estimate the possible sources of these elements, and mainly the pollutants. The most likely sources are the steel and fertilizer industries, besides their harbors which are the mainly way to receive raw materials and export their products. The results showed very high values for the analyzed elements Hg (0,12-1,81 mg.kg-1); Ag (0,04- 1,36 mg.kg-1); Ca (0,15-3,18%); Cd (0,08-5,69 mg.kg-1); Co (8,30-17,0 mg.kg-1); Cu (13,9-79,7 mg.kg-1); Fe (3,01-29,94%); Mn (204-2540 mg.kg-1); P (560-44079 mg.kg- 1); Pb (20-196 mg.kg-1); Zn (67-499 mg.kg-1), some of them can be compared to very degraded areas around the world. The Fe was used to dating the sediment since its excess concentration is related to the steel production. So three contaminations phases were identified, Phase 1 between 95-48 cm, with a sedimentation rate of 2,76 cm/ano, corresponding to the steel plant construction and low production; Phase 2 among 48-18 cm, with a sedimentation rate of 3,75 cm/ano, it was when a big acceleration happened at the steel production; and Phase 3 between 18-1 cm, with a sedimentation rate of 1,00 cm/ano, relative to the implementation of the environmental control at Cubatão and a high steel production. Furthermore, Fe was taken as a tracer for the pollutants that come from the steel plant and P for those that are originated from the fertilizer industry. Thus, through a principal component analysis, the elements Mn, Ag, Zn, Pb, Cu and Co were related to steel production. Ca showed a difuse behavior. The Hg didn t demonstrated any trend to the discussed sources, then it was suggested that its source could the coal used at the steel plant, which is removed C to make the steel, and is used as a source power. However the highest concentrations were found at the bottom of the core, which is related to preindustrial times, nevertheless there aren t any records about pollutants activities on the study area in those years. The enrichment factors were very high, in some cases they are extreme, as happen to Ag (20,62), Cd (41,51) e P (55,78). This could be a warning showing how highly impacted the area is.|
|Appears in Collections:||TEDE sem arquivo|
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