Development of novel and sensitive methods for the determination of sulfide in aqueous samples by hydrogen sulfide generation-inductively coupled plasma-atomic emission spectroscopy (original) (raw)
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Kinetic Spectrophotometric Determination of Trace Amounts of Sulfide
A method for the determination of trace amount of sulfide based on the addition reaction of sulfide with methyl green at pH 7.5 and 25 o C is described. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance of the dyestuff at 637 nm by the initial rate and fixed time method. The calibration graph is linear in the range 30-1200 ppb. The theoretical limit of detection was 0.014 ppm. Seven replicate analysis of a sample solution containing 0.70 ppm sulfide gave a relative standard deviation of 1.5%. The interfering effects of various ions on sulfide determination have been reported and procedures for removal of interference have been described. The proposed method was applied successfully to the determination of sulfide in tap and wastewater samples.
Kinetic spectrophotometric determination of traces of sulfide
Talanta, 1997
A method for the determination of trace amount of sulfide based on the addition reaction of sulfide with methyl green at pH 7.5 and 25 o C is described. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance of the dyestuff at 637 nm by the initial rate and fixed time method. The calibration graph is linear in the range 30-1200 ppb. The theoretical limit of detection was 0.014 ppm. Seven replicate analysis of a sample solution containing 0.70 ppm sulfide gave a relative standard deviation of 1.5%. The interfering effects of various ions on sulfide determination have been reported and procedures for removal of interference have been described. The proposed method was applied successfully to the determination of sulfide in tap and wastewater samples.
2017
Sulfides and sulfur oxyanions, including thiosulfate, sulfate, and polythionates, can impact environmental quality and have negative economic consequences for industrial processes. For example, anaerobic reduction can produce toxic corrosive hydrogen sulfide, and oxidation can lead to environmental acidification accompanied with mobilization of toxic metals. Understanding the chemistry of various systems so that the reductive or oxidative processes can be curtailed requires methods to quantify key sulfur species. Accurate quantitation requires baseline separation and accommodation for co-migrating interferents, such as thiosulfate which co-migrates with chloride, found in abundance in briny waters. A strategy was developed using two capillary zone electrophoresis (CZE) methods, one with direct detection and the other with indirect detection, for speciation analysis of charged sulfur species (sulfate (SO42-), thiosulfate (S2O32-), tetrathionate (S4O62-), sulfite (SO32-), and sulfide ...
Journal of Chemistry, 2019
e determination of reduced sulfur species in aquatic systems is not an easy and fast task to accomplish regarding the numerous possible interferences and risks of oxidation that occur with the usual methods of quantification. e method presented here is a direct spectrophotometric method that can be used to quantify sulfides, sulfites, and thiosulfates in a simple and rapid way. e principle is based on the comparison of second-derivative absorbance spectra of the same sample at different pH (9.2, 4.7, and 1.0) and selected absorption wavelengths (250 and 278 nm). is method has been successfully tested and has demonstrated liability to (i) avoid the biases due to absorbance overlaps between the different major chemical species and (ii) keep, as a direct method, the advantages over indirect methods on interferences reduction. e limits of detections (LOD) reached for total sulfide, sulfite, and thiosulfate are 1.37, 7.32, and 1.92 µM, respectively. e method displays low accuracy mean and low relative standard deviation (<4%) as well as a good linearity (R 2 > 0.999). Accordingly, this method represents a very robust alternative in terms of cost and rapidity for the quantification of reduced sulfur species in different aquatic environments, from freshwaters to saline and polluted systems.
Determination of sulfide in waters by flow-injection solid phase spectrophotometry
The Analyst, 2000
A highly sensitive flow injection solid-phase spectrophotometric method was developed for the determination of sulfide in waters. The method is based on the formation of Methylene Blue (MB) by reaction between sulfide and N,N-dimethyl-p-phenylenediamine chloride in presence of Fe(III) in acidic medium. The MB formed was adsorbed on C 18 bonded silica, located inside a laboratory-made flow cell, which was placed in the optical path of the spectrophotometer. Analyte retention and detection at 666 nm were performed simultaneously, followed by elution with a mixture of methanol and hydrochloric acid. Several variables of the system, such as amine concentration, acidity of the reaction medium, reactor coil volume, sample volume and flow rate of the cleaning solution, were studied in order to achieve the best performance in the analysis of natural samples. This procedure provides an alternative for the determination of sulfide in the range 5-50 g L 21 with a relative standard deviation of 4.0% for 10 independent determinations at a concentration level of 50 g L 21 . A detection limit of 1.7 g L 21 , for a confidence level of 99.7%, was found. The system presented an analytical throughput of 12 h 21 .
Analytical Chemistry, 1993
Hydrogen sulfide in natural waters can be found as dlssolved uncompiexed species (Le., "free sulfide", H2Saq + HS-+ S2-), as dissolved metal sulfide complexes ( "complexed sulflde"), and as particulate metal sulfides. To examlne the distributlon of hydrogen sulfide species and carbonyl sulfide In natural waters, a technique for their sampllng and simultaneous determination was developed. Contamination and loss are minimized by using trace metal-clean and hermetic sampling techniques and apparatus. The analytical method Is based on stripping an acldlfled 1-300-mL sample wlth helium, liquid nitrogen-cooled trapping of the evolved gases, followed by gas chromatographic separation and flame photometric detection. To eliminate storage artlfacts, determinations are made in the field immedlateiy after sample collection. Detection limits are 0.2 pmol/L for total dlssolved sulfide and 1.3 pmoi/L for OCS. Precislon Is better than 5 % (relatlve standard devlatlon) for both sulfur compounds at the 50 pmol/L level. The method can also determine hydrogen sulflde In the headspace of a sample (H2Sg); this concentration can In turn be used to calculate the concentration of free sulflde that Is in equilibrium wlth H2Sg. I n comblnatlon with selective chemical treatments, the method can also be appiled to the determination of acid-volatile sulflde and chromlum-reducible sulfur in suspended particles. The procedures have been used to analyze a variety of natural water and sediment samples.