Potentiometric titration behavior of sodium sulfide, methyl mercaptan, dimethyl sulfide, dimethyl disulfide and polysulfides in mixed alkaline solutions and sulfate pulping black liquors

1975 ◽  
Vol 47 (12) ◽  
pp. 1910-1916 ◽  
Author(s):  
S. T. Chiu ◽  
L. Paszner
Keyword(s):  
Potentiometric Titration ◽  
Dimethyl Sulfide ◽  
Sodium Sulfide ◽  
Dimethyl Disulfide ◽  
Alkaline Solutions ◽  
Methyl Mercaptan ◽  
Black Liquors

Orientation stimulants from substances attractive to Lucilia cuprina (Diptera, Calliphoridae)

1998 ◽  
Vol 38 (5) ◽  
pp. 461 ◽  
Author(s):  
M. C. Morris ◽  
A. D. Woolhouse ◽  
B. Rabel ◽  
M. A. Joyce
Keyword(s):  
Gas Chromatography ◽  
Volatile Compounds ◽  
Mass Spectroscopy ◽  
Dimethyl Sulfide ◽  
Sodium Sulfide ◽  
Gravid Female ◽  
Dimethyl Disulfide ◽  
Lucilia Cuprina

Summary. Liver and liver–sodium sulfide mixtures, sheep faeces, urine and gut mucus are known attractants for the sheep blowfly Lucilia cuprina (Weid.). These substances were analysed for volatile compounds using gas chromatography coupled with mass spectroscopy. The most commonly detected compounds were tested in a bioassay for their potential as attractants for gravid female L. cuprina. Flies orientated towards pulses of dimethyl sulfide at a concentration of 1 µg/g but not 0.1 or 10 µg/g. Ethane thiol elicited a response at a concentration of 10 µg/g but not at 1 µg/g. Dimethyl disulfide did not elicit orientation at 10 µg/g.

scholarly journals Promotional Effects of Rare-Earth Praseodymium (Pr) Modification over MCM-41 for Methyl Mercaptan Catalytic Decomposition

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 400
Author(s):  
Xiaohua Cao ◽  
Jichang Lu ◽  
Yutong Zhao ◽  
Rui Tian ◽  
Wenjun Zhang ◽  
...  
Keyword(s):  
Dimethyl Sulfide ◽  
Catalytic Decomposition ◽  
Product Distribution ◽  
Acid Sites ◽  
Methyl Mercaptan ◽  
Praseodymium Oxide ◽  
X Ray ◽  
Xps Characterization ◽  
Temperature Programmed ◽  
Mcm 41

Praseodymium (Pr)-promoted MCM-41 catalyst was investigated for the catalytic decomposition of methyl mercaptan (CH3SH). Various characterization techniques, such as X-ray diffraction (XRD), N2 adsorption–desorption, temperature-programmed desorption of ammonia (NH3-TPD) and carbon dioxide (CO2-TPD), hydrogen temperature-programmed reduction (H2-TPR), and X-ray photoelectron spectrometer (XPS), were carried out to analyze the physicochemical properties of material. XPS characterization results showed that praseodymium was presented on the modified catalyst in the form of praseodymium oxide species, which can react with coke deposit to prolong the catalytic stability until 120 h. Meanwhile, the strong acid sites were proved to be the main active center over the 10% Pr/MCM-41 catalyst by NH3-TPD results during the catalytic elimination of methyl mercaptan. The possible reaction mechanism was proposed by analyzing the product distribution results. The final products were mainly small-molecule products, such as methane (CH4) and hydrogen sulfide (H2S). Dimethyl sulfide (CH3SCH3) was a reaction intermediate during the reaction. Therefore, this work contributes to the understanding of the reaction process of catalytic decomposition methyl mercaptan and the design of anti-carbon deposition catalysts.

Volatile Sulfur Compounds Produced by Methionine Degrading Bacteria and the Relationship to Concrete Corrosion

1984 ◽  
Vol 39 (3-4) ◽  
pp. 240-243 ◽  
Author(s):  
Manfred Pohl ◽  
Eberhard Bock ◽  
Marian Rinken ◽  
Mitat Aydin ◽  
Wilfried A. König
Keyword(s):  
Waste Water ◽  
Gas Chromatography ◽  
Glucose Concentration ◽  
Dimethyl Sulfide ◽  
Dimethyl Disulfide ◽  
Proteus Vulgaris ◽  
Concrete Corrosion ◽  
Degrading Bacteria ◽  
The Relationship ◽  
Volatile Sulfur

Pseudomonas fluorescens, Proteus vulgaris, and Serratia marcescens, members of the microflora of soil and waste water, attacked methionine in the presence of glucose. The sulfur of methionine was released as methane thiol, dimethyl sulfide and dim ethyl disulfide. The volatile sulfur com pounds were qualitatively and quantitatively investigated by gas chromatography. Dimethyl disulfide was formed of methane thiol by various bacteria to a different extent. Growing in the presence of oxygen, S. marcescens oxidized most of the m ethane thiol to dim ethyl disulfide. In the presence of glucose. P. fluorescens dissimilated m ethionine with production of m ethane thiol and dimethyl disulfide. The dissimilation was stimulated with decreasing glucose concentration

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