• Title/Summary/Keyword: Sulfate soil

Search Result 496, Processing Time 0.024 seconds

Effect of Lime and Phosphorus to Rice Plant on Acid Sulfate Soil (특이산성답(特異酸性畓)에서 수도(水稻)에 대(対)한 석회(石灰) 및 인산(燐酸)의 효과(効果))

  • Hwang, Nam-Yul;Park, Keon-Ho;Kim, Jin-Kee
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.16 no.1
    • /
    • pp.64-71
    • /
    • 1983
  • This experiment was carried out to investigate the effect of lime and phosphorus on soil and yield of rice plants in acid sulfate soil. 1. Lime requirement plus phosphorus (20Kg/10a) plot showed 60% increased in yield. 2. The effect of increase was 36% in lime and 15% in phosphorus. 3. pH and Eh were reversed each other by lime application, and lime and phosphorus increased soil reduction. 4. Sixty two percent of root was distributed in top soil (0-5cm) of control plot while it spreaed in sub soil (5-10cm) with high level of lime and phosphorus plot. 5. Soil pH reached maximum at maximum tillering stage and decreased there after approching near to original pH. But lime requirement was about half of original one. 6. There was significant positive correlation between yield silica or phosphorus in soil, which were high with increase of pH. 7. The application of lime and phosphorus increased nitrogen content in plants. When contents of phosphorus in rice plants were high the yield of rice was increased.

  • PDF

Purification and Properties of Arylsulfatase of Serratia marcescens (Serratia marcens Arylsulfatase의 정제와 성질)

  • Yim, Moo-Hyun
    • Microbiology and Biotechnology Letters
    • /
    • v.5 no.4
    • /
    • pp.177-184
    • /
    • 1977
  • Arylsulfatase catalyzes the release of SO$\sub$4//sup2/- from sulfate esters of simple phenols. Arylsolfatase occurs widely in animal tissues and in microorganisms including soil bacteria. Its widespread distribution suggests that it has a rather fundamental function and environmental meaning. It has been shown previously that arylsulfatase of Klebsiella was purified and characterized. A condition of arylsulfatase synthesis was tested with several strains of Serratia. Serratia marcescens could not utilize some sugars, such as xylose, rhamnose, glucosamine and arabinose hut glucose and mannitol as a sole carbon source. However, arylsulfatase synthesis was repressed by glucose but not by mannitol. The enzyme synthesis was repressed ob inorganic sulfate and methionine, and this repression was relieved by addition of tyramine. Arylsulfatase of S. marcescen was purified by fractionation with ammonium sulfate and followed by chromatographies on DEAE-Cellulose CM-Cellulose, and DEAE-Sephadex A-25. The molecular weight of arylsulfatase was determined to be 46,000 by SDS-Gel electrophoresis and 49,000 by Sephadex G-100 column chromatography. The enzyme showed some different properties with that of K. aerogenes. The activity was maximum at pH 6.8. The Km and Vmax values for p-nitrophenyl sulfate were 2.5${\times}$10$\^$-4/ M and 20 nmoles/min/mg protein, respectively. The enzyme showed high activities toward phenyl sulfate, ο-and p-nitro phenyl sulfates, and p-nitrocatechol sulfate. The inhibition of enzyme was strongly affected by hydroxylamine, inorganic fluoride, sulfide and phosphate, but by inorganic sulfate. Like Klebsiella arylsulfatase, tyramine, octopamine, and dopamine gave signifcant inhibitory effect.

  • PDF

Effect of Lime on Growth of Rice and Changes in pH, Eh, Fe2+ and Al in an Acid Sulfate Soil (특이산성토양에서 석회시용이 벼의 생육과 토양의 pH, Eh, Fe2+, Al 변화에 미치는 영향)

  • Park, Nae Joung;Park, Young Sun;Kim, Yung Sup
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.4 no.2
    • /
    • pp.167-175
    • /
    • 1971
  • A pot experiment with an acid sulfate soil from Kimhae was carried out to find out the cause of toxicity in rice plant. The effect of liming on changes in pH, Eh, Al, and $Fe^{2+}$ in soil and leachate was examined at two-week interval during the growth of rice. Also, total $P_2O_5$, $SiO_2$, Fe and Al contents in plants at harvesting stage were determined. In the early stage, the rice plant in the check soil showed the same healthy growth as did in limed soil even at high Al in soil and leachate. Around panicle forming stage, reddish brown mottlings suddenly infested all over the plants when accompanied with strong reduction, and afterward growth was severely retarded, and finally caused the significant difference in yield. During the strong reduction, significant amount of sulfide was formed only in check soils, but no free $H_2S$ was detected. Appreciable Al was still present in soil and leachate, and $Fe^{2+}$ in check soil was lower than that in limed soil, but $Fe^{2+}$ in leachate was slightly higher. Limed soils were more reduced and produced more $Fe^{2+}$ due to increased microorganism activity in the neutral pH. In the leachate, the check showed slightly higher $Fe^{2+}$ concentration but considerably higher than limed one at later stage. Appreciable amount of Al was detected only in check soil and leachate from transplanting to panicle formation stage. Plant tissues at harvesting stage contained very low P regardless of liming. Uptake of Si was markedly increased by liming. Contents of Fe an Al was markedly higher in check than limed one, but difference in Fe content was more drastic possibly due to more Fe uptake in presence of markedly higher $Fe^{2+}$ in soil and leachate at later growing stage. In conclusion toxic symptom in this acid sulfate soil seems to be primarily due to Al when accompanied with low pH and strong reduction. But association with $Fe^{2+}$ toxicity is not completely excluded. In order to differentiate the effect of $Fe^{2+}$ from that of Al more detailed plant analysis at different stage is required.

  • PDF

Application of Nanosized Zero-valent Iron-Activated Persulfate for Treating Groundwater Contaminated with Phenol

  • Thao, Trinh Thi;Kim, Cheolyong;Hwang, Inseong
    • Journal of Soil and Groundwater Environment
    • /
    • v.22 no.1
    • /
    • pp.41-48
    • /
    • 2017
  • Persulfate (PS) activated with nanosized zero-valent iron (NZVI) was tested as a reagent to remove phenol from groundwater. Batch degradation experiments indicated that NZVI/PS molar ratios between 1 : 2 and 1 : 5 were appropriate for complete removal of phenol, and that the time required for complete removal varied with different PS and NZVI dosages. Chloride ions up to 100 mM enhanced the phenol oxidation rate, and nitrate of any concentration up to 100 mM did not significantly affect the oxidation rate. NZVI showed greater performance than ferrous iron did as an activator for PS. A by-product was formed along with phenol degradation but subsequently was completely degraded, which showed the potential to attain mineralization with the NZVI/PS system. Tests with radical quenchers indicated that sulfate radicals were a predominant radical. The results of this study suggest that NZVI is a promising activator of PS for treating contaminated groundwater.

Geostatistical Analysis of Soil Enzyme Activities in Mud Flat of Korea

  • Jung, Soohyun;Lee, Seunghoon;Park, Joonhong;Seo, Juyoung;Kang, Hojeong
    • Ecology and Resilient Infrastructure
    • /
    • v.4 no.2
    • /
    • pp.93-96
    • /
    • 2017
  • Spatial variations of physicochemical and microbiological variables were examined to understand spatial heterogeneity of those variables in intertidal flat. Variograms were constructed for understanding spatial autocorrelations of variables by a geostatistical analysis and spatial correlations between two variables were evaluated by applications of a Cross-Mantel test with a Monte Carlo procedure (with 999 permutations). Water content, organic matter content, pH, nitrate, sulfate, chloride, dissolved organic carbon (DOC), four extracellular enzyme activities (${\beta}-glucosidase$, N-acetyl-glucosaminidase, phosphatase, arylsulfatase), and bacterial diversity in soil were measured along a transect perpendicular to shore line. Most variables showed strong spatial autocorrelation or no spatial structure except for DOC. It was suggested that complex interactions between physicochemical and microbiological properties in sediment might controls DOC. Intertidal flat sediment appeared to be spatially heterogeneous. Bacterial diversity was found to be spatially correlated with enzyme activities. Chloride and sulfate were spatially correlated with microbial properties indicating that salinity in coastal environment would influence spatial distributions of decomposition capacities mediated by microorganisms. Overall, it was suggested that considerations on the spatial distributions of physicochemical and microbiological properties in intertidal flat sediment should be included when sampling scheme is designed for decomposition processes in intertidal flat sediment.

Studies on the Characteristics of Nitrogen Fertilizers and Influence of Sulfur Application on Rice Plant (질소질 비료의 특성 및 유황비료에 따른 수도성장에 관한 연구)

  • Kyung-Je Kim;Se-Kee Moon;Byung-Sik Shin;Se-Kee Moon;Ki-Joo Kim
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.20
    • /
    • pp.122-133
    • /
    • 1975
  • In recent years, farmers have substituted urea for ammonium sulfate as nitrogen fertilizer in their crop production. Since crops can not take urea itself directly as it is, we attempted to determine the amount of decomposition of urea in soil. It was observed that 25 percent of urea which had initially mixed with soil was decomposed in 10 days at 15$^{\circ}C$ and 80 percent in 2 days at $25^{\circ}C$. Therefore, it was considered that large amount of urea could be lost in cool season and cool areas. In the other experiment, ammonium sulfate, as a source of sulfur, was so mixed with urea that the ratio of sulfur to nitrogen would be 15 percent. Small amount of dolomite was also added to this mixture and the resulting fertilizer was applied on the rice plants. Eight percent of yield increase was obtained together with the increased protein content in brown rice.

  • PDF

나노 크기 적철석 입자 피복 모래를 이용한 지하수내 비소 3가와 5가의 제거 기술 개발

  • 고일원;이철효;이상우;김주용;김경웅
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
    • /
    • 2003.09a
    • /
    • pp.78-82
    • /
    • 2003
  • Development of hematite-coated sand was evaluated for the application of the PRB (permeable reactive barrier) in the arsenic-contaminated subsurface of the metal mining areas. The removal efficiency of As(III) and As(V), the effect of anion competition and the capability of arsenic removal in the flow system were investigated through the experiments of adsorption isotherm, arsenic removal kinetics against anion competition and column removal. Hematite-coated sand followed a linear adsorption isotherm with high adsorption capacity at low level concentrations of arsenic (< 1.0 mg/l). When As(III) and As(V) underwent adsorption reactions in the presence of anions (sulfate, nitrate and bicarbonate), sulfate caused strong inhibition of arsenic removal, and bicarbonate and nitrate caused weak inhibition due to specific and nonspecific adsorption onto hematite, respectively. In the column experiments, high content of hematite-coated sand enhance the arsenic removal, but the amount of the arsenic removal decreased due to the higher affinity of As(V) than As(III) and reduced adsorption kinetics in the flow system, Therefore, the amount of hematite-coated sand, the adsorption affinity of arsenic species and removal kinetics determined the removal efficiency of arsenic in the flow system. arsenic, hematite-coated sand, permeable reactive barrier, anion competition, adsorption.

  • PDF

Sorption of Arsenate by the Calcined Mg-Al Layered Double Hydroxide (소성된 Mg-Al Layered Double Hydroxide에 의한 비소(V)의 흡착)

  • Seo, Young-Jin;Kang, Yun-Ju;Choi, Jung;Kim, Jun-Hyeong;Park, Man
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.41 no.6
    • /
    • pp.369-373
    • /
    • 2008
  • Special concern has been given to the elevated arsenic content in soils because of its high mobility and toxicity. Layered double hydroxide (LDH) which has a high anionic exchange capacity is another potential anion adsorbent for toxic anions such as arsenic, chromate and selenium etc. The uptake of arsenate from aqueous solutions by the calcined Mg-Al LDH has been investigated. The sorption capacity was about 530 mmol/kg. Sorption isotherm was defined as L-type in which arsenate was removed by LDH through anion uptake reaction. Arsenate sorption by the calcined Mg-Al LDH was occurred by reconstruction of LDH's framework. Competitive adsorption revealed that Mg-Al LDH had higher selectivity for arsenate than for sulfate. These results strongly suggest that calcined Mg-Al LDH has a promising potential for efficient removal of toxic metal oxides like arsenates from aqueous environments.

Single-particle Characterization of Aerosol Samples Collected at an Underground Shopping Area (단일입자분석법을 이용한 지하상가에서 채취한 실내입자의 특성분석)

  • Kang, Sun-Ei;Hwang, Hee-Jin;Park, Yu-Myung;Kang, Su-Jin;Kim, Hye-Kyung;Ro, Chul-Un
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.24 no.5
    • /
    • pp.594-603
    • /
    • 2008
  • A single particle analytical technique, named low-Z particle electron probe X-ray microanalysis, was applied to characterize four samples collected at an underground shopping area connected to Dongdeamun subway station, in January and May 2006. Based on the analysis of their chemical compositions of the samples, many distinctive particle types are identified and the major chemical species are observed to be soil-derived particles, iron-containing particles. sulfates. nitrates, and carbonaceous particles. which are encountered both in coarse and fine fractions. Carbonaceous particles exist in carbon-rich and organic. Soil derived particles such as aluminosilicates, AlSi/C, $CaCO_3\;and\;SiO_2$ are more frequently encountered in spring samples than winter samples. Nitrate- and sulfate-con taming particles are more frequently encountered in winter samples, and those nitrate- and sulfate-containing particles mostly exist in the chemical forms of $Ca(CO_3,\;NO_3),\;Ca(NO_3,\;SO_4),\;(Na,\;Mg)NO_3\;and\;(Mg,\;Na)(NO_3,\;SO_4)$. Fe-containing particles which came from nearby subway platform are in the range of about 10% relative abundances for all the samples. It is observed that nitrate- and sulfate-containing particles and carbonaceous particles are much more frequently encountered in indoor aerosol samples than in outdoor aerosols, implying that $NO_x,\;SO_x$, and VOCs at the underground shopping area were more partitioned into aerosol phase.

Elucidation of Corrosion and Failure of Stainless Steel Tubing buried in Soil for Potable Water (토양매설 스테인리스강 상수도 배관의 부식원인 규명)

  • Kim, Young Sik;Park, Soojin;Hwangbo, Deok;Shin, Mincheol
    • Corrosion Science and Technology
    • /
    • v.11 no.1
    • /
    • pp.20-28
    • /
    • 2012
  • Since buried pipes contact the soil directly, corrosion by the soil could be occurred. Recently, some stainless steel pipes after 8 years burial at G area were corroded and leaked. In order to elucidate highly corroded phenomena(its rate was about 0.175 mm/y) of these pipes, the investigation for corrosion environment, soil, stray current's effect, and chemical analysis on the pipes were performed. Most of investigated sites were close to traditional water-closet and showed high moisture and thus those areas could be highly corrosive. In the investigation by two kinds of soil evaluation methods, it was revealed that the soils at G areas were highly corrosive, and moreover the contents of sulfate reducing bacteria in the soils were high. Also, open circuit potentials of many pipes showed different values and its potentials were high positive. Therefore, it was considered that corrosion of buried pipes at G area could be affected by high corrosive soil's environment and stray current corrosion.