Sulfide Determination
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. "Rio Grande Reservoir: limnological characteristics of the water and metal bioavailability in sediment." / "Reservatório Rio Grande: caracterização limnológica da água e biodisponibilidade de metais-traço no sedimento"
The Rio Grande branch is a part of Billings Complex and is isolated from the central body by Anchieta Dam. This reservoir is located in São Paulo Metropolitan Region and has multiple uses, including water supply, recreation, leisure, receptor of domestic and industrial wastewater. At the present work, the water column was studied in 6 stations along the res
Publicado em: 2006
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14. Avaliação e síntese de corantes fenotiazínicos para determinação espectrofotométrica de sulfeto e sulfito empregando sistemas de análise em fluxo.
In this work seven aromatic amines O e N-substituted were evaluated at optimized reaction conditions for symmetrics phenothiazinic dyes. DMPD, DEPD, PPD, PAP e PAA were the start reagent, where the yield for phenothiazinic dyes varying from 10% to 43% for different oxidizing (Fe3+ or ClO-), acids (H2SO4 or HBF4) and precipitant agent (ClO4 - or BF4 -). The l
Publicado em: 2004
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15. Detecção piezelétrica não-gravimétrica de boro empregando cristal de quartzo com eletrodo separado e superfície quimicamente modificada / Non-gravimetric piezoelectric detection of boron by using quartz crystal with electrode separated and chemically modified surface
Piezoelectric quartz crystals (PQCs) with electrode-separated configuration and chemically modified surface were used to develop a boron sensor. A detection cell was built in such a way that a stainless-steel electrode was held at a short distance (0.3 mm) from the PQC surface, whose original gold electrode was removed. By using impedance spectroscopy, oscil
Publicado em: 2003
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16. Determinação dos elementos do grupo da platina após fusão coletora com sulfeto de nível
The nickel sulfide fire assay was used to separate and to concentrate the platinum group elements (PGE) and gold (Au) from geological matrices, seeking their analytic determination. The fire assay was accomplished by fusing 10 g of sodium carbonate, 20 g of sodium tetraborate, 1 g of nickel, 0,75 g of sulfur and 10 to 20 g of sample, thoroughly mixed. After
Publicado em: 1999
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17. Technique for Simultaneous Determination of [35S]Sulfide and [14C]Carbon Dioxide in Anaerobic Aqueous Samples †
A technique for the simultaneous determination of [35S]sulfide and [14C]carbon dioxide produced in anaerobic aqueous samples dual-labeled with [35S]sulfate and a 14C-organic substrate is described. The method involves the passive distillation of sulfide and carbon dioxide from an acidified water sample and their subsequent separation by selective chemical ab
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18. Determination of Hydrogen Sulfide in Fermentation Broths Containing SO21
A procedure for the determination of hydrogen sulfide in fermentation broths containing up to 100 μg of SO2 per ml is described. The method involves the sparging of H2S from the broth into a cadmium hydroxide absorption solution, the formation of methylene blue from the absorbed sulfide, and the measuring of this color spectrophotometrically. The use of cad
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19. In Situ Determination of Sulfide Turnover Rates in a Meromictic Alpine Lake
A push-pull method, previously used in groundwater analyses, was successfully adapted for measuring sulfide turnover rates in situ at different depths in the meromictic Lake Cadagno. In the layer of phototrophic bacteria at about 12 m in depth net sulfide consumption was observed during the day, indicating active bacterial photosynthesis. During the night th
American Society for Microbiology.
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20. Tryptophan and hydrogen sulfide reaction from modified trypticase soy agar.
The use of Trypticase soy agar modified by the addition of 0.05% ferric ammonium citrate and 0.01% sodium thiosulfate for the determination of indole, phenylpyruvic acid, anthranilate, kynurenine, and hydrogen sulfide reactions is described.
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21. HYDROGEN SULFIDE DETERMINATION IN BACTERIAL CULTURES AND IN CERTAIN CANNED FOODS
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22. Simple Assay for Accurate Determination of [35S]sulfate Reduction Activity
A method is described for the assay of [35S]sulfate reduction in which filter paper wicks are used to trap [35S]sulfide. The simplicity of the technique enables large numbers of samples to be conveniently processed. Enhanced sensitivity is achieved since all acid-volatile [35S]sulfides produced during the incubation period are counted. Recovery of radioactiv
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23. Oxidation of Dimethyl Sulfide to Dimethyl Sulfoxide by Phototrophic Purple Bacteria
Enrichment cultures of phototrophic purple bacteria rapidly oxidized up to 10 mM dimethyl sulfide (DMS) to dimethyl sulfoxide (DMSO). DMSO was qualitatively identified by proton nuclear magnetic resonance. By using a biological assay, DMSO was always quantitatively recovered from the culture media. DMS oxidation was not detected in cultures incubated in the
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24. Correlations Between Virulence and Other Characters of Clostridium perfringens Type A
The correlation analysis which has already proved its value in ecology has not yet been applied to the determination of virulence indicators. Its application to a group of Clostridium perfringens type A strains has brought out some characters that may be considered as virulence indicators. This study suggests that the toxicity of the culture supernatant flui