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| Dehairs, F.A.; Chesselet, R.; Jedwab, J.. |
| Barite particles are a universal component of suspended matter in the Atlantic and Pacific Oceans. This is demonstrated by scanning electron microscope and electron microprobe analyses of samples collected during the GEOSECS program. These discrete particles, about 1 µm in diameter, account for by far the greatest part of the total particulate barium of most of the filters collected at different depths. Total particulate barium (mean value: 20 ng/kg seawater) was measured on the same filters by instrumental neutron activation analysis.Several observations indicate that biochemical, rather than purely chemical, processes are involved in the formation of the BaSO4 mineral in the water column. Sr/Ba molar ratios among the individual barite grains,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Barite; Barium. |
| Ano: 1980 |
URL: http://www.vliz.be/imisdocs/publications/228699.pdf |
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| Magalhães, Marcio Osvaldo Lima; Universidde Federal Rural do Rio de Janeiro; Sobrinho, Nelson Moura Brasil do Amaral; Universidade Federal Rural do Rio de Janeiro; Zonta, Everaldo; Universidade Federal Rural do Rio de Janeiro; Becerra, Alfredo Tolón; University of Almería; Lastra-Bravo, Xavier Bolívar; University of Almería; Coutinho, Izabella Bezerra; Universidade Federal Rural do Rio de Janeiro. |
| To evaluate the possible solubilization of barium sulfate in soils under reducing conditions and its effects on barium bioavailability, an Oryza sativa pot trial was established. Increasing barium doses and two redox potential conditions were evaluated. The geochemical fractionation data demonstrated that reducing conditions led to an increase in the levels of more labile forms of barium and a reduction in more stable forms. Furthermore, higher doses of barium were found to have a negative impact on grain production. The highest levels of barium accumulation in the leaves, roots, and grains were observed with the highest barium dose under reducing conditions. These results demonstrate that reducing conditions increased barium bioavailability and absorption... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.01.03-0 contamination; Barite; Oryza sativa Química do Solos. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17539 |
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| ABIB,GEIZILA A.P.; CRUZ,GEORGIANA F. DA; VAZ JUNIOR,ALEXANDRE S.L.. |
| Abstract In offshore oil wells it is very common to perform seawater injection through injection wells for hydrocarbon recovery. When seawater, rich in sulfate ion, mixes with formation water, whose composition can contain divalent cations such as barium and calcium, it often leads to sulfate salts formation due to their chemical incompatibility. These salts can cause serious damage in production wells. The barium sulfate (BaSO4) is the most problematic scale and may cause many complications. In order to solve this issue, polycarboxylic acids, such as diethylene triamine pentaacetic acid, are used. Thus, the primary focus of this work was to develop an experimental procedure to study the BaSO4 dissolution. Initially, through static tests to understand the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mineral scale; Barite; Oil reservoir; Formation damage. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000603185 |
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