Determination Of Organic Sulfur Research Articles

Fabrication of magnetically engineered nanosorbent for separation and determination of organic sulfur containing oil pollution in environmental water samples

In this study, an engineered Fe3O4@SiO2-SH core–shell was synthesized as a novel, selective, efficient, cost-effective, and magnetic nanosorbent from natural materials such as sea sand and rice husk. TEM, FE-SEM, EDX, XRD, TGA, VSM, BET, and FTIR were used for the characterization of nanosorbents. A comprehensive study has been done for the adsorption and determination of thiophene as an important sulfur-containing aromatic petroleum contamination. Adsorption isotherms, kinetics and thermodynamics were also studied. Determination of thiophene was done by UV–Vis spectroscopy at 222 nm. The effective parameters in the separation and determination of thiophene were optimized. The detection limit of the method is equivalent to 88 µg/L and the dynamic linear range is in the range of 800 to 19200 µg/L. Based on the Langmuir isotherm, the maximum absorption capacity for the nanoabsorbent is 204.08 mg/g. River water, textile factory effluent, and oil refinery effluent were successfully applied as the real samples for separation and determination of thiophene. The results were checked with spike recovery test and direct measurement gas chromatography method. The statistical analysis shows a good agreement between the results of the two methods.

Determination of Organic and Reduced Inorganic Sulfur by Multi-element Scanning Thermal Analysis

Determination of organic sulfur in solid environmental samples has been difficult because there is no appropriate separation technology. Routine organic sulfur analysis has mostly been done indirectly by the difference between the total and the inorganic sulfur contents. This indirect analysis is tedious, accumulating multiple sampling and procedural errors, and has no chemical characterization information. There are modern technologies such as S-XANES for direct sulfur analysis on solid samples. But they are sophisticated, expensive, and unavailable for routine sulfur analysis. Due to those analytical difficulties, our understanding of sulfur chemistry in solid samples has been limited. This study was initiated to apply a convenient Multi-Element Scanning Thermal Analysis (MESTA) method for direct analysis of organic and reduced inorganic sulfur in solid samples. If successful, sulfur MESTA will be a convenient and powerful tool for studying environmental sulfur cycles and sulfur-containing materials. We used 27 reference organic and reduced inorganic sulfur compounds to validate the MESTA method. The results indicate that MESTA can directly quantify and characterize organic and reduced inorganic sulfur compounds. Recoveries of the reference compounds were in the range of 77.0% to 97.7% except for sulfate functional group containing compounds of bathophenanthrolinedisulfonic acid (57.4 ± 6.7%), sodium thiosulfate (60.6 ± 3.1%) and sodium dodecyl sulfate (38.0 ± 2.6%). MESTA is rapid, sensitive, and inexpensive. It is a convenient and powerful tool for sulfur analysis in a wide range of solid, liquid, or mixed samples.

Kinetic Analysis in the Maximum Temperature of Oil Generation by Thermogravimetry in Spanish Fossil Fuels

Low-rank coals characterized by a high content of sulfur from Mequinenza (type III−S), Calaf (type III), and Utrillas (type III) basins, as well as type I−S oil shales from Ribesalbes were analyzed by thermogravimetry for deriving kinetic parameters from many TG curves recorded with different heating rates (5, 15, and 25 K/min) in maximum temperature of oil generation (Tmax) using a equation defined by Zsako. These results are contrasted with those obtained by NLS (nonlinear least squares) algorithms which derive kinetic parameters nearby Tmax from single TG curve. Furthermore, analytical determination of organic sulfur has allowed the comparison of different maximum temperatures of oil generation, as well as apparent activation energies, to establish general trends when different types of kerogen are compared. Finally, a method to compare the kinetic parameters at different heating rates (5, 15, and 25 K/min) is applied nearby the maximum temperature of oil generation (Tmax) obtaining similar kinetic val...

Determination of organic sulphur in sedimentary rocks by pyrolysis

The determination of organic sulphur in sedimentary rocks by means of pyrolysis has been studied. The method can be used to improve source rock characterization and to help geochemical interpretation.

Determination of organic sulphur in raw and chemically cleaned coals by scanning electron microscopy and energy dispersive X-ray spectrometry

Scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDS) is a useful method to evaluate chemical cleaning processes and to obtain values of the organic sulphur remaining in cleaned coals. Pressed pellets can be used when the cleaning process has made the coal too heterogeneous to analyse by the conventional epoxy mounting method. The SEM-EDS analysis time is the same for both methods, whereas the preparation of pellets is much easier than that of epoxy mounts. The overall analysis time should therefore be decreased by using the pellet technique.

Barium titration of sulfate with chlorophosphonazo III as indicator

Abstract Chlorophosphonazo III may be used for visual indication of a sulfate precipitation titration with barium chloride, perchlorate or nitrate. Titration in acidic medium up to 0.1 N of strong mineral acid and application of EDTA masking are possible. The determination of organic sulfur by the combustion method is also possible with use of this indicator.

Determination of Organic Sulfur in Nonvolatile Materials by Rapid Open-Tube Oxidation

Determination of Organic Sulfur in Nonvolatile Materials by Rapid Open-Tube Oxidation

Determination of Organic Sulfur

Determination of Organic Sulfur

Determination of Organic Sulfur in Gas

Determination of Organic Sulfur in Gas

Determination of organic sulfur by the liquid ammonia-sodium method

Determination of organic sulfur by the liquid ammonia-sodium method

Determination of Organic Sulfur in Gas

Determination of Organic Sulfur in Gas