• Title, Summary, Keyword: organic sulfur

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Thermochemical Sulfate Reduction Simulation Experiments on the Formation and Distribution of Organic Sulfur Compounds in the Tuha Crude Oil

  • Yue, Changtao;Li, Shuyuan;Song, He
    • Bulletin of the Korean Chemical Society
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    • v.35 no.7
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    • pp.2057-2064
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    • 2014
  • Thermochemical sulfate reduction (TSR) was conducted in autoclave on the system of crude oil and $MgSO_4$ at different temperatures. Gas chromatography pulsed flame photometric detector (GC-PFPD) was used to detected the composition of organic sulfur compounds in oil phase products. The results of the analysis indicate that with increased temperature, the contents of organic sulfur compounds with high molecular weight and thermal stability, such as benzothiophenes and dibenzothiophenes, gradually became dominated. In order to gain greater insight into the formation and distribution of organic sulphur compounds from TSR, positive ion electrospray Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) was used in detecting the detailed elemental composition and distribution of them. The mass spectra showed that the mass range of sulfur compounds was 200-550 Da. Four sulfur class species, $S_1$, $N_1S_1$, $O_1S_1$ and $O_2S_1$, were assigned in the positive-ion spectrum. Among the identified sulfur compounds, the $S_1$ class species was dominant. The most abundant $S_1$ class species increase associated with the DBE value and carbon number increasing which also indicates the evolution of organic sulfur compounds in TSR is from the labile series to the stable one. In pure blank pyrolysis experiments with crude oil cracking without TSR, different composition and distribution of organic sulfur compounds in oil phase products were seen from mass spectra in order to evaluate their pyrolysis behaviors without $MgSO_4$. FT-IR and XRD were used in analyzing the products of solid phases. Two distinct crystallographic phases MgO and $MgSO_4$ are found to coexist in the products which demonstrated the transformation of inorganic sulfur compounds into organosulfur compounds exist in TSR.

Effect of Soil Sulfur treatment on Apple Valsa Canker (유황토분 처리가 사과 부란병에 미치는 영향)

  • Chun, Ik-Jo;Park, Seung-Min
    • Korean Journal of Organic Agriculture
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    • v.25 no.1
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    • pp.125-134
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    • 2017
  • This study was carried out to examine the effects of soil sulfur mixture on the control apple valsa canker in apple orchard for two years. In organic apple orchard, The recovery percentages of apple valsa canker were compared among control (no treatment), lime sulfur, and soil sulfur in organic orchards. In conventional apple orchards, those of recovery percentages were compared among control, neoasozin, lime sulfur, and soil sulfur. Compared with control, soil sulfur treatments significantly improved the recovery percentages of apple valsa canker infected trees in organic orchard. However, there were no differences between lime sulfur and soil sulfur treatment in organic apple orchard, except BongHyun orchard experiment in 2013. Compared with control fruit qualities, fruit skin red color and fruit firmness were improved in lime sulfur and soil sulfur treatment, respectively. In conventional orchard, apple trees treated with lime sulfur, soil sulfur or neoasozin improved recovery percentages, compared with those of control trees. Soil sulfur treatments recovered 87.5~97.5% of infected 'Fuji'/MM106 apple trees in organic and conventional apple orchards. The trees applied with neoasozin showed significant lower shoot growth than those of soil sulfur treatment in conventional orchard. Soli sulfur treatment improved fruit red color, but did not affected fruit weight, fruit firmness, soluble solids concentrations, and titratable acidity.

Effects of Soil Acidity and Organic Matter by Application of Organic Materials and Soil Mulching with Pine Needles for Soil Surface Management in Blueberry Eco-Friendly Farming

  • Ahn, In;Kim, Sam-Hyun;Maeng, Woon-Young;Lee, In-Eae;Chang, Ki-Woon;Lee, Jong-Jin
    • Korean Journal of Soil Science and Fertilizer
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    • v.46 no.6
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    • pp.556-562
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    • 2013
  • The blueberry eco-friendly farming requires the soil condition of pH 4.2 ~ 5.2 and high in organic matters for stable growth. Most of soil types of blueberry-growing land in Korea, however, belongs to alkaline soils with low organic matter content. As a result, the eco-friendly blueberry growers use peat moss and sulfur powder heavily to improve the soil condition, but the guideline on the effective use of organic materials was not established yet. Therefore, this sturdy was performed to investigate the effect of increasing soil acidity and organic matters by using organic materials. Among 5 organic materials, the pH of soil was lowest in degradable sulfur + bentonite (pH 4.1) and followed by Peat moss+Chaff+Pine Needlesmixtures(pH 4.5), OrganicAcid +vinegar (pH 4.7), Sulfur powder (pH 4.8), Temperature response Elutioner (pH 5.2). The soil organic matter content were increased in the following order: Peat moss+Chaff+Pine Needlesmixtures (8.4%) > degradable sulfur + bentonite (7.8%) > Organic Acid + vinegar (7.2%) > Sulfur powder ${\fallingdotseq}$ Temperature response Elutioner (6.3%). Although different in the degree, all organic materials treated was recognized a good material for improving soil pH and organic matter content. The plant height and stem diameter of blueberry were no clear difference among 5 organic materials. Another study was carried out to investigate amending soils with organic matter by soil mulching with pine needles for soil surface management in blueberry organic cultivation. The effect of increasing the soil pH by pine needle mulching in blueberry eco-friendly farming was recognized in four test fields. Pine needle mulching for soil surface management in blueberry appeared several advantages, such as improving of soil pH and organic matter content. Therefore, pineneedle mulching in blueberry organic farming is considered as the most efficient means of mulching cultivation for amending soil pH, weed suppression and moisture conservation among mulching materials.

경유의 Model solution에서 고정화효소를 이용한 Dibezothiophene의 산화

  • Heo, Jeong-Chan;Seong, Hyeon-Tae;Ryu, Geun-Gap
    • 한국생물공학회:학술대회논문집
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    • pp.517-520
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    • 2001
  • Fossil fuels such as coal and crude oil contain various organic sulfur compounds. Combustion of these fuels emit sulfur oxides which are considered as msjor air pollutants causing acid rain problem. Among various organic sulfur compounds, aromatic sulfur compounds of thiophenes which constitute major sulfur fractions of heavy oils are not easily removed by hydrodesulfurization. Many peroxidase and hemoproteins are known to oxidize dibenzothiophene (DBT) to dibenzothiophene-sulfoxide(DBT - sulfoxide) then dibenzothiophene- sulfone (DBT-sulfone). The oxidation of DBT by the immobilized hemoproteins in n-octane was increased significantly when the hemoproteins were deposited on celites of the particle size between 0.75 - 1.0 mm and a conventional substrates. such as t-butyl hydroperoxide and cumene hydroperoxide. In anhydrous organic solvents with log P values larger than 4.0 DBT was completely oxidized by cumene hydroperoxide catalyzed by cytochrome c deposited on celites.

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Effect of Organic Sulfur-Containing Compounds on Hepatotoxicity in Rats Induced by N, N-Dimethylnitrosamine (디메틸니트로자민에 의한 흰쥐의 간독성에 미치는 유기황화합물의 효과)

  • Shin Hea Soon;Kang Joo Yeon
    • Environmental health and toxicology
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    • v.20 no.3
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    • pp.237-242
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    • 2005
  • This study il focused on the hepatopreventive effect in cirrhotic rats induced by N, N -dimethylnitrosamine treatment when organir Lulfur -containing compoundE were orally injected. Biochemical parameters (aspatate transaminase (AST), alanine transaminase (ALT) alkaline phosphatase (ALP), 1-protein and t-bilirubin) were measured in serum injured liver tissue. The increased AST and ALT values were significantly reduced by organic sulfur-containing compounds at the oral dotes of 50 mg/kg. The result of morphological changes have illustrated the accumulation of liver damages, Each as inflammatory cell accumulation and cirrhosis, caused by N, N-dimethylnitrosamine. Also, it was found that liver damages were prevented by the treatment of organic sulfur- containing compounds.

A Study on the Flavor Compounds of Dongchimi (동치미의 맛 성분에 관한 연구)

  • Lee, Mae-Ry;Lee, Hei-Soo
    • Korean journal of food and cookery science
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    • v.6 no.1
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    • pp.1-8
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    • 1990
  • To study the most optimum condition of Dongchimi, the various Dongchimi distinct from the amount of salt, the temperature of fermentation and the ratio of radish to water were examed by sensory evaluation. Also, the content of volatile organic acids and nonvolatile organic acids were investigated by GC, the content of sulfur compounds by GC/MS. Volatile organic acids were identified with those butyl esters and nonvolatile organic acids were done with those TMS derivatives. Sulfur compounds and those decomposed products were extracted by steam distillation In results, the most optimum conditions ware salt 2.4% fermented temperature $4^{\circ}C$, ratio 1:1.5. Volatile organic acids detected were formic, acetic acid, and the amounts were effected by saltness. Nonvolatile organic acids detected were lactio, malio, fumario, tartario acid. Lactic acid was thought to effect overall eating quality. Sulfur compounds were almost the isothiocyanate groups in raw radish, which little in fermented Dongchimi.

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Reducing Phytotoxic by Adjusted pH and Control effect of Loess-Sulfur Complex as Organic Farming Material against Powdery Mildew in Tomato (유기농자재인 황토유황합제의 약해 경감 및 흰가루병 방제효과)

  • Shim, Chang-Ki;Kim, Min-Jeong;Kim, Yong-Ki;Hong, Sung-Jun;Kim, Suk-Chul
    • The Korean Journal of Pesticide Science
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    • v.18 no.4
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    • pp.376-382
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    • 2014
  • The soluble loess-sulfur mixture allowed standing to remove insoluble component materials for five weeks after manufacturing. We decreased the pH level of soluble loess-sulfur mixture at pH 1.0 modified with decreasing 25% sodium hydroxide than original content. The pH ranges of soluble loess-sulfur mixture solutions were adjusted to pH 5.0-pH 11.0 (pH 1 unit) with brown rice vinegar (pH 2.8). The pH of original loess-sulfur mixture was about pH 13 and damaged the foliar parts and young leaves of tomato after twice application. These stock solutions can be diluted 500:1 with tap water to make a 0.05% working solution and were sprayed two times with 7 days interval to the leaf and stem of tomato, which were spontaneously infected with E. cichoracearum. Control efficacy of powdery mildew ranged from 85% to 90% at 7 days after first application. After second application, each loess-sulfur mixture solutions adjusted pH level significantly suppressed the powdery mildew disease in tomato. Consequently, loess-sulfur complex adjusted pH level with brown rice vinegar was suggested to be low in acute toxicity at all different pH values and suggested to use an agent for control of tomato powdery mildew in organic farming.

A Comparison of Fattening Performance, Physico-Chemical Properties of Breast Meat, Vaccine Titers in Cross Bred Meat Type Hybrid Chicks Fed Sulfur (유황을 급여한 육용 교잡계의 성장능력과 계육의 물리.화학적인 성상의 비교)

  • 박재홍;류명선;이영은;송근섭;류경선
    • Korean Journal of Poultry Science
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    • v.30 no.3
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    • pp.211-217
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    • 2003
  • A study was conducted to investigate the fattening performance, physico-chemical properties of breast meat, vaccine titers in cross bred meat type hybrid chicks fed organic sulfur. Total three hundred and sixty chicks of eight weeks old were replaced in individual cage from 8 to 10 weeks old. Four levels of organic sulfur (0, 1.0, 2.0, 4.0%) containing 45% sulfur were added into basal diet containing CP 19% and ME 2,950 kcal/kg. Weight gain, feed intake, fred conversion were weekly measured. The proximate composition, physico-chemical properties of breast meat, vaccine titer and sensory characteristics were examined at the end of experiment. Weight gain, feed intake and feed conversion of birds fed organic sulfur were not statistically different with control. There were no significant difference in feed intake and feed conversion. However, abdominal fat(%) of birds fed organic sulfur tended to increase compared with control. Crude fat of breast meat decreased significantly in organic sulfur treatments(P<0.05). The red color of breast meat seemed to increase but was not statistically different among the treatments. Cooking loss showed decrements significantly in organic sulfur treatments(P<0.05). Mechanical Hardness, cohesiveness and springiness were prone to be high and gumminess greatly high in breast meat of birds fed organic sulfur addition compared with control. Juiciness tended to increase and greasiness decreased(P<0.05) in organic sulfur treatments by the sensory evaluation. The overall acceptability of the breast meat was the highest at 2.0% organic sulfur added chicks(P<0.01). There were no different blood cholesterol, AST, ALT and BUN.

Suppression of Melanose Caused by Diaporthe citri on Citrus Leaves Pretreated with Bio-sulfur

  • Shin, Yong Ho;Ko, Eun Ju;Kim, Su Jeong;Hyun, He Nam;Jeun, Yong Chull
    • The Plant Pathology Journal
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    • v.35 no.5
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    • pp.417-424
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    • 2019
  • Melanose, caused by Diaporthe citri, is one of severe diseases in citrus, a major economic resource in Jeju island. To reduce the usage amount of organic synthetic fungicide, bio-sulfur was tested as an alternative chemical to control citrus melanose in the present study. Direct antifungal activity of bio-sulfur against D. citri was determined through in vitro experiment using artificial nutrient media. Disease severity of melanose on bio-sulfur pretreated citrus leaves was lower than that on untreated ones. To illustrate the mechanism of disease suppression by bio-sulfur, infection structures were observed with a fluorescent microscope and a scanning electron microscope. In fluorescent microscopic observation, most conidia rarely germinated. In addition, hyphal growth on leaves pretreated with bio-sulfur was inhibited compared to that on untreated ones. In scanning electron microscope images of bio-sulfur pretreated leaves, surfaces of most conidia were shrunk while hyphae were morphologically changed and frequently branched. Such microscopic observations were also found for leaves pretreated with a commercial fungicide Dithianon. These results suggest that bio-sulfur may be used to control citrus melanose as an environment friendly alternative to organic synthetic fungicides

Deposition of Functional Organic and Inorganic Layer on the Cathode for the Improved Electrochemical Performance of Li-S Battery

  • Sohn, Hiesang
    • Korean Chemical Engineering Research
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    • v.55 no.4
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    • pp.483-489
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    • 2017
  • The loss of the sulfur cathode material through dissolution of the polysulfide into electrolyte causes a significant capacity reduction of the lithium-sulfur cell during the charge-discharge reaction, thereby debilitating the electrochemical performance of the cell. We addressed this problem by using a chemical and physical approach called reduction of polysulfide dissolution through direct coating functional inorganic (graphene oxide) or organic layer (polyethylene oxide) on electrode, since the deposition of external functional layer can chemically interact with polysulfide and physically prevent the leakage of lithium polysulfide out of the electrode. Through this approach, we obtained a composite electrode for a lithium-sulfur battery (sulfur: 60%) coated with uniform and thin external functional layers where the thin external layer was coated on the electrode by solution coating and drying by a subsequent heat treatment at low temperature (${\sim}80^{\circ}C$). The external functional layer, such as inorganic or organic layer, not only alleviates the dissolution of the polysulfide electrolyte during the charging/discharging through physical layer formation, but also makes a chemical interaction between the polysulfide and the functional layer. As-formed lithium-sulfur battery exhibits stable cycling electrochemical performance during charging and discharging at a reversible capacity of 700~1187 mAh/g at 0.1 C (1 C = 1675 mA/g) for 30 cycles or more.