On Line Dissolution of ZnS For Sulfide Determination in Stabilized Water Samples with Zinc Acetate, Using Spectrophotometry by Methylene Blue Method

Cassella, Ricardo J.; Oliveira, Leandra Guimarães de; Santelli, Ricardo Erthal

doi:10.1080/00387019909349999

Cited by 27 publications

(9 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Briefly, for AVS and SEM determination, an amount of wet sediment (about 1 g as dry sample) was treated in an adequate glass apparatus (Allen et al, 1991) with 20 ml of 6 mol l −1 HCl for 1 h and the H 2 S produced was absorbed into 80 ml of 0.5 mol l −1 NaOH. This solution was further analysed for sulphide determination by flow injection spectrophotometry (Cassella et al, 1999). For SEM (Zn, Pb, Cd, Cu and Ni) and also for Fe and Mn determination, the resulting solution of AVS analysis was filtered (0.45 μm pore size) and diluted to 50 ml with ultrapure water.…”

Section: Methodsmentioning

confidence: 99%

“…These re-suspension experiments were carried out in duplicate. Filtered water samples (0.45 m pore cellulose membrane filter) were subsampled for sulphide determination (5 ml preserved with zinc acetate) by flow injection spectrophotometry (Cassella, Oliveira, & Santelli, 1999); for sulphate determination (5 ml) by ion chromatography (DX-500, Dionex Corporation) according to the APHA recommended procedure (APHA, 1999) and for dissolved metals determination (10 ml acidified with one drop of sub-boiling nitric acid) by ETV-ICP-MS (Elan 5000, Perkin Elmer Sciex) according to Pozebon (Pozebon, Dressler, & Curtius, 1998). DO and pH in the suspension water samples were determined in situ using appropriate probes.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Contaminant Metal Behaviour During Re-suspension of Sulphidic Estuarine Sediments

Maddock

Carvalho

Santelli

et al. 2006

Water Air Soil Pollut

View full text Add to dashboard Cite

Sediment re-suspension experiments have been conducted to predict contaminants release from sediments to the water column, during dredging operations. In this context, polluted, anoxic estuarine sediments from Rio de Janeiro, SE Brazil, were suspended in oxygenated estuarine water, in laboratory experiments intended to simulate their dispersion by flood flow or dredging operations, in order to measure any release into solution of heavy metals originally present as sulphides that might suffer oxidation. Oxidation of sulphides to sulphate acidified the waters but only after at least 5 h of suspension. Furthermore, the oxidation of acid volatile sulphide (AVS) to sulphate was more rapid and only proceded to completion within 5 days, when large quantities of sulphide forming metals other than Fe were not present. In sediment heavily polluted with zinc, oxidation of AVS was slower and incomplete, resulting in soluble release of a much smaller fraction of the Zn present in the sediment and a maximum dissolved zinc concentration that was much lower than that resulting from less contaminated sediment. The maximum percentages of sulphide-bound metals appearing in solution at any time during re-suspension were low, less than 46% in all cases and typically less than 10%. These maxima were manifested only after acidification by sulphate formation. Appreciable metal dissolution would not occur in an estuary if dilution and dispersion separated the sediment from acid generated or if dredged material settled before acidification occurred.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Contaminant Metal Behaviour During Re-suspension of Sulphidic Estuarine Sediments

Maddock

Carvalho

Santelli

et al. 2006

Water Air Soil Pollut

View full text Add to dashboard Cite

show abstract

“…Given the high pK 2 of H 2 S (Meyer et al 1983;Migdisov et al 2002) and, therefore, the pH dependence of S 2-concentrations determined by ISE, the accuracy and precision of total free sulphides determined by this method ultimately rely on a precisely defined pH for SAOB-porewater mixtures. This method also provides the opportunity to preserve centrifuged porewater samples for return to shore and measurement in the laboratory (for example Cassella et al 1999). Preserved samples could be analysed for porewater-free sulphide with more accuracy and precision with a variety of methodologies reducing some of the variability introduced through measurements with a field-adapted ISE.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

“…Since sulphide crystals were not stored under nitrogen, the stock solution concentration was determined through slight modifications to the iodometric method described by Clesceri et al (1998) and Parsons et al (1984). The stock solution was preserved with 2M zinc acetate and refrigerated (Cassella et al 1999). Standards used for the FIA system were made via serial dilution of the stock solution.…”

Section: Total Free Sulphide Determinationmentioning

confidence: 99%

Determination of Total Free Sulphides in Sediment Porewater and Artefacts Related to the Mobility of Mineral Sulphides

et al. 2011

View full text Add to dashboard Cite

A field and laboratory study of the accuracy of a method commonly used to determine free sulphide concentrations in the porewater of marine sediments is presented. The method uses an ion-selective electrode (ISE), sensitive to the sulphide ion (S 2-), in sediments buffered to high pH ([12) and is commonly used in regulatory monitoring programs to assess the impacts of open net-pen finfish aquaculture on local marine habitats.Here we report that on the timescale of field measurements, the accepted protocol can lead to significant bias of free sulphide measurements, with orders of magnitude higher concentration detected in the buffered sediment-porewater slurry than in porewater samples isolated and analysed separately. Laboratory experiments with model marine sediments and analysis of sediment composition indicate that this bias is likely introduced by the dissolution of particulate sulphides and/or sulphur present in the sediments under the intense alkaline conditions of the protocol. Recommendations for the modification and continued use of this commonly applied field methodology are discussed.

show abstract

“…5 Sulfide is produced in natural waters from the oxidation of organic matter and the reduction of sulfate ions. 6,7 Other important contributors to such releases are the leather and paper processing industries. 8,9 Sodium sulfide has been extensively used in the removal of hair from animal hides with processing liquors containing sulfide ion concentration up to 2000 ppm.…”

Section: Introductionmentioning

confidence: 99%

Micellar-Mediated Extractive Spectrophotometric Determination of Hydrogen Sulfide/Sulfide through Prussian Blue Reaction: Application to Environmental Samples

Malingappa

Devaramani

2010

ANAL. SCI.

View full text Add to dashboard Cite

On Line Dissolution of ZnS For Sulfide Determination in Stabilized Water Samples with Zinc Acetate, Using Spectrophotometry by Methylene Blue Method

Cited by 27 publications

References 14 publications

Contaminant Metal Behaviour During Re-suspension of Sulphidic Estuarine Sediments

Contaminant Metal Behaviour During Re-suspension of Sulphidic Estuarine Sediments

Determination of Total Free Sulphides in Sediment Porewater and Artefacts Related to the Mobility of Mineral Sulphides

Micellar-Mediated Extractive Spectrophotometric Determination of Hydrogen Sulfide/Sulfide through Prussian Blue Reaction: Application to Environmental Samples

Contact Info

Product

Resources

About