| Full text | |
| Author(s): |
Elisabete S. Braga
[1]
;
Luanny M. Lucena
[2]
;
Antonio Jeferson M. Almeida
[3]
;
Maria Luiza T. Pires
[4]
;
José Elias F. do Nascimento
[5]
;
Bruno O. Sutti
[6]
;
Glaucia B. B. Berbel
[7]
;
Vitor G. Chiozzini
[8]
Total Authors: 8
|
| Affiliation: | [1] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
[2] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
[3] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
[4] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
[5] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
[6] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
[7] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
[8] Universidade de São Paulo. Instituto Oceanográfico. Departamento de Oceanografia Física, Química e Geológica - Brasil
Total Affiliations: 8
|
| Document type: | Journal article |
| Source: | Química Nova; v. 46, n. 6, p. 591-607, 2023-08-07. |
| Abstract | |
THE ESTUARINE ENVIRONMENT AND pH VARIATION: NATURAL LIMTS AND EXPERIMENTAL OBSERVATION OF THE ACIDIFICATION EFFECT ON PHOSPHORUS BIOAVAILABILITY. This study shows the variation of pH in the Cananéia-Iguape Estuarine-Lagoon Complex (CIELC). Data from 3 years (2019, 2021, 2022) were obtained in 17 points presenting the following ranges: temperature (14.88-27.05 ºC), pH (7.16-8.40) and DIP (0.20-11.28 µmol L-1) along a saline gradient (0.05-32.09) under different hydrodynamics, biogeochemical processes and anthropogenic influence. The pH buffering capacity due to the presence of weak acid salts in saline water (S ≥ 30) was associated to the lowest DIP, decreasing with low salinity values, confirming the direct correlation among salinity and pH. The highest temperatures in the winter of 2021, corroborated with the abnormal climate event in that year. An in vitro experiment showed results of the interaction of PID and sediments with different textures, with and without the presence of the benthic microbiota under a considerable decreasing of the pH (acidification) in relation to the natural condition of this environment. The P sediment flux characterized Iguape sector as a P sink with or without biota, Ararapira sector as a P source with biota and Cananéia, as P source without biota. The salt water buffered the pH and sediment buffered DIP both associated to the biogeochemical and hydrodynamic processes contribute to the homeostasis in the system. (AU) | |
| FAPESP's process: | 22/05823-4 - Study of the carbon system in two Brazilian estuarias (MA - SP), with emphasis on total alkalinity and differentiated hydrodynamics |
| Grantee: | Antonio Jeferson Muniz Almeida |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 20/16485-7 - Biogeochemical and socio-environmental study of coastal ecosystems: contribution to the assessment of sustainability and environmental impact (BIOGEOQUIS-ECOS) |
| Grantee: | Elisabete de Santis Braga da Graça Saraiva |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/08738-2 - Stable isotope characterization of humic acids and retention capacity for Pb and other heavy metals in the Cananeia-Iguape coastal system (São Paulo - Brazil) |
| Grantee: | Christian Millo |
| Support Opportunities: | Regular Research Grants |