Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Impact of harbour, industry and sewage on the phosphorus geochemistry of a subtropical estuary in Brazil

Full text
Berbel, Glaucia B. B. [1] ; Favaro, Deborah I. T. [2] ; Braga, Elisabete S. [1]
Total Authors: 3
[1] Univ Sao Paulo, Inst Oceanog, Lab Nutrients Micronutrients & Trace Elements Oce, BR-05508120 Sao Paulo, SP - Brazil
[2] CNEN SP, Inst Pesquisas Energet & Nucl, Lab Instrumental Neutron Activat Anal INAA, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Marine Pollution Bulletin; v. 93, n. 1-2, p. 44-52, APR 15 2015.
Web of Science Citations: 15

The distribution of different forms of phosphorus in surface sediment from 17 sites were investigated by SEDEX method. The sites were divided into three sectors: Santos Channel (SC - influenced by harbour, fertilizers plants and phosphogypsum mountains), sao Vicente Channel (SVC- domestic waste) and Santos Bay (SS - sewage outfall). The average percentage of each P fraction of the surface sediments in this region followed the sequence P-Fe (38%) > P-org (27%) > P-exch (13%) > Detrital - P (12%) > Auth - P (10%). P-tata, varied from 3.57 to 74.11 mu mol g(-1), in both seasons. In SVC, P-exch ranged from 13% to 27% and P-org varied from 12% to 56%. These high percentages of P-exch/P-total (greater than 20%) may be related to low oxygen resulting from oxygen consumed by intensive organic matter decomposition as well as the salty water that leads to cation and anion flocculation. Also, the possibility of an influence related to the industrial source of ech.s P I not ruled out. No significant seasonal differences were found among sites, - x except for sewage outfall, with changing in the grain size and hence, the P geochemistry. During the summer in the sewage outfall station, P-org represented 37% of P-total, which decreased to 13% in the winter. These results suggest that high percentages of organic phosphorus cannot be attributed only to autochthonous and allochthonous organic matter, but also to detergents and/or domestic waste. In contrast, spatial differences among sectors were observed, with the highest values of each fraction associated with sites near industrial and domestic waste activities. (C) 2015 Elsevier Ltd. All rights reserved. (AU)