• Title/Summary/Keyword: Metal Phosphate

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Evaluation of the Performance of Multi-binders (lime, DAP and ladle slag) in Treating Metal(loid)s-contaminated Soils (중금속류 오염 토양 처리를 위한 복합 고화제(lime, DAP, 래들 슬래그) 성능 평가)

  • Choi, Jiyeon;Shin, Won Sik
    • Journal of Environmental Science International
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    • v.26 no.8
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    • pp.955-966
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    • 2017
  • Amendment of multi-binders was employed for the immobilization of metal(loid)s in field-contaminated soils to reduce the leaching potential. The effect of different types of multi-binders (lime/diammonium phosphate, diammonium phosphate/ladle slag and lime/ladle slag) on the solidification/stabilization of metal(loid)s (Pb, Zn, Cu and As) from the smelter soil and mine tailing soil were investigated. The amended soils were evaluated by measuring Toxicity Characterization Leaching Procedure (TCLP) leaching concentration of metal(loid)s. The results show that the leaching concentration of metal(loid)s decreased with the immobilization using multi-binders. In terms of TCLP extraction, the mixed binder was effective in the order of lime/ladle slag > diammonium phosphate/ladle slag > lime/diammonium phosphate. When the mixed binder amendment (0.15 g lime+0.15 g ladle slag for 1g smelter soil and 0.05 g lime+0.1 g ladle slag for 1 g mine tailing soil, respectively) was used, the leaching concentration of metal(loid)s decreased by 90%. However, As leaching concentration increased with diammonium phosphate/lime and diammonium phosphate/ladle slag amendment competitive anion exchange between arsenic ion and phosphate ion from diammonium phosphate. The Standard, Measurements and Testing programme (SM&T) analysis indicated that fraction 1 (F1, exchangeable fraction) decreased, while fraction 4 (F4, residual fraction) increased. The increased immobilization efficiency was attributed to the increase in the F4 of the SM&T extraction. From this work, it was possible to suggest that both arsenic and heavy metals can be simultaneously immobilized by the amendment of multi-binder such as lime/ladle slag.

Study on the Thermal Decomposition Behavior of[ABS/PC/Triphenyl Phosphate/Transition Metal Chloride] Compounds ([ABS/PC/Triphenyl Phosphate/Transition Metal Chloride] 컴파운드의 열분해 거동 연구)

  • Jang Junwon;Kim Jin-Hwan;Bae Jin-Young
    • Polymer(Korea)
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    • v.29 no.4
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    • pp.338-343
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    • 2005
  • The thermal degradation of ABS/PC/triphenyl phosphate compounds in the presence of transition metal chloride catalysts has been studied by thermogravimetric analysis (TGA). The reaction of transition metal chloride catalysts (cobalt chloride, ferric chloride, nickel chloride and zinc chloride) and ABS/PC/triphenyl phosphate compounds has been found to occur during the thermal degradation of the compounds. In a nitrogen atmosphere, char formation is observed, and $3\~13\%$of the reaction product is non-volatile at $600^{circ}$. The resulting enhancement of char formation in a nitrogen atmosphere has been explained as a catalytic crosslinking effect of transition metal chloride catalysts. On the other hand, transition metal chloride catalyzed char formation of ABS/PC/triphenyl phosphate compounds in air was unsuccessful due to the oxidative degradation of the char at a higher temperature.

Physicochemical Characteristics of Selective Adsorption of Tin Phosphate on the Transition metal ions (전이금속 이온에 대한 주석 인산염의 선택적 흡착에 관한 물리화학적 특성)

  • Ahn, Beom-Shu
    • Journal of the Korean Applied Science and Technology
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    • v.37 no.5
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    • pp.1222-1228
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    • 2020
  • The adsorption and ion exchange properties of tin phosphate were studied in an aqueous solution of KCl, varing the pH and metal ion concentration in the solution. The data were explained on the basis of chemical equilibrium. Tin phosphate behaved as an acidic ion exchanger and had an adsorption selectivity toward the bivalent transition metal ions in the following order : Cu+2 > Co+2 > Ni+2. As in the case of a weekly acidic exchanger, the change in hydration of metal ions played the dominant role in determining the selectivity of tin phosphate. In all cases the extent of adsorption increased with an increase in temperature and concentration. The apperance of irregular kinks in the titration curves justified the presence of several exchangeable adsorption sites with different pKa values.

Substrate Variety of a Non-metal Dependent Tagatose-6-phosphate Isomerase from Staphylococcus aureus (Staphylococcus aureus 유래 비금속성 이성화효소인 Tagatose-6-phosphate Isomerase의 기질다양성)

  • Oh Deok-Kun;Ji Eun-Soo;Kwon Young-Deok;Kim Hye-Jung;Kim Pil
    • Microbiology and Biotechnology Letters
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    • v.33 no.2
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    • pp.106-111
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    • 2005
  • To investigate the substrate variety of a putative non-metal dependent isomerase, the tagatose-6-phosphate isomerase (E.C. 5.3.1.26) structural genes (lacB; 510bp and lacA; 430bp) of Staphylococcus aureus were subcloned and co-expressed. Based on the substrate configuration, various aldoses were surveyed for substrate of ketose isomerization. Among the 10 aldoses tested, D-ribose and D-allose were isomerized by the enzyme. The subunit A and B showed more than $95\%$ activity for D-ribose and $75\%$ for D-allose in the presence of 1mM EDTA compared with non-EDTA conditions, which implying tagatose-6-phosphate isomerase is a non-metal dependent isomerase. Each of subunit A or subunit B alone showed no activity for any of the substrates tested. The affinity constant ($K_m$) of tagatose-6-phosphate isomerase against D-ribose and D-allose were 26 mM and 142 mM, respectively.

Heavy Metal Resistant Phosphate Solubilizing Bacteria

  • Song, June-Seob;Walpola, Buddhi Charana;Chung, Doug-Young;Yoon, Min-Ho
    • Korean Journal of Soil Science and Fertilizer
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    • v.45 no.5
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    • pp.817-821
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    • 2012
  • Soil samples collected from abounded mines of Boryeong area in South Korea were used in isolating bacterial strains and their capacity to solubilize inorganic phosphates and heavy metal tolerance were assessed in vitro. Three different inorganic phosphate sources (Ca phosphate, Fe phosphate, and Al phosphate) and four different heavy metals (Co, Cd, Pb and Zn) each with three concentrations ($100{\mu}g\;mL^{-1}$, $200{\mu}g\;mL^{-1}$, and $400{\mu}g\;mL^{-1}$) were used. The bacterial isolates PSB-1, PSB-2, PSB-3, and PSB-4 solubilized significantly higher amount of Ca phosphate during the first five days of incubation though subsequent drop in soluble phosphorus level in the medium was observed at the later stage (after 5 days) of the incubation. Solubilization of Ca phosphate and Fe phosphate was concomitant with the acidification of the culture medium compared to the control where it remained constant. Isolated strains could solubilize Fe phosphate to certain extent ($25-45{\mu}g\;mL^{-1}$) though solubilization of Al phosphate was found negligible. All the isolates were tolerant to heavy metals (Cd, Pb, and Zn) up to the concentration of $400{\mu}g\;mL^{-1}$ except PSB-1 and PSB-8, which were shown to be vulnerable to Co even at $100{\mu}g\;mL^{-1}$. Heavy metal tolerant strains should be further evaluated for plant growth promoting activities also under field conditions in order to assess their agricultural and environmental significance.

Effect of Mechanical Polishing Pretreatment on Tribological Properties of Manganese Phosphate Coating of Carbon Steel (기계적 연마 전처리가 인산망간 피막의 윤활 특성에 미치는 영향)

  • Kim, Ho-Young;Noh, Young-Tai;Jeon, Jun-Hyuck;Kang, Ho-Sang
    • Journal of the Korean institute of surface engineering
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    • v.52 no.6
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    • pp.350-356
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    • 2019
  • In this study, the effect of mechanical polishing of carbon steel on the tribological properties of manganese phosphate coating on carbon steel has investigated. The microstructure, surface morphology and chemical composition were analyzed by SEM, EDS, and XRD. The surface roughness test was carried out in order to calculate Rvk value by 3D laser microscopy. Also, the tribology property of manganese phosphate coating was tested by ball-on disk. In the results of EDS analysis, coating layer consists of elements such in Mn, P, Fe, and O. XRD showed that (Mn,Fe)5H2(PO4)4·4H2O in manganese phosphate coating layer was formed by the chemical reaction between manganese phosphate and elements in carbon steel. As the mechanical polishing degree increased, the friction coefficient was reduced. The rougher the mechanical polishing degree, the better corrosion resistance was obtained.

An Eurpium(III) Hydrolytic Catalyst Favoring Anionic Phosphate Esters over Phosphate Triester'

  • Yun, Chang Won;O, Sun Jin;Jeon, Yeong Jin;Choe, Yeong Seo;Son, Yun Gyeong;HwangBo, Seok;Gu, Ja Gang;Park, Jun Won
    • Bulletin of the Korean Chemical Society
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    • v.22 no.2
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    • pp.199-204
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    • 2001
  • A Cryptate (221) having a short alcohol pendant (2) was metallated with europium(Ⅲ) in anhydrous condition, and its hydrolytic activity for phosphate esters at neutral pH was examined. While the activity for the phosphate diester and monoester is comparable to that of the parent metal complex [1Eu]3+, its hydrolytic activity towards a phosphate triester is significantly suppressed. Potentiometric titration and luminescence spectroscopic studies for the equilibrium behavior of the complex in solution suggest that a dimer formation through the metal hydroxides as well as the pendant alcohol is likely to happen. The low hydrolytic activity for the triester seems to be associated with the dimer formation.

Stabilization of Heavy Metals using Ca-Citrate-Phosphate Solution: Effect of Soil Microorganisms (구연산/칼슘/인산염 용액을 이용한 토양 중금속 안정화: 토양 미생물이 미치는 영향)

  • Song, Ho-Cheol;Song, Doo-Sup;Cho, Dong-Wan;Park, Sung-Won;Choi, Sang-Hun;Jeon, Byong-Hun;Lee, Jang-Ho;Park, Joon-Hong
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.4
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    • pp.241-248
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    • 2009
  • A farming area located near an abandoned copper mine in GuPo-ri, Choongchung province is heavily contaminated with heavy metals such as As, Pb, Cd, Cu and Zn of which concentrations are higher than the values typically detected in Korean soil environment. In this work, laboratory and field studies were conducted to examine feasibility of using Ca-citrate-phosphate solution in stabilizing heavy metals in the polluted soils. In laboratory batch experiments with field soil, the addition of Ca-citrate-phosphate solution resulted in decrease of aqueous phase concentration of phosphate and improvement of heavy metal stabilization, compared to those for sterilized soil samples. This indicates that microbial uptake of phosphate may have provided positive effects on availability of phosphate toward heavy metal stabilization. According to microbial community analysis for the field experiment, the use of Ca-citrate-phosphate led to increased diversity of microbial populations, and strict anaerobic microorganisms such as Anaerofilum and Treponema became the most dominant populations in the solution-amended field experiments. These findings suggest that, when Ca-citrate-phosphate is used for heavy metal stabilization in soils, microbial processes may have important roles in improving the stabilization of heavy metals by providing reducing conditions to the treatment locations or/and by making phosphate available to heavy metal stabilization.

Solidification of Heavy Metal Ions using Magnesia-Phosphate (인산염 마그네시아에 의한 중금속 이온 고정화)

  • Song, Myong-Shin;Kang, Hyun-Ju;Choi, Hun;Kim, Ju-Sung
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.317-318
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    • 2010
  • At the latest industry develops, heavy metals or sludge contaminated surrounding farm land and rivers. In this study, wished to solve problem by saying contaminated sludge and tailing and heavy metals to do solidification using Magnesia phosphate cement. Confirmed through above experiment that magnesia is effect in solidification and stabilization of chromium and lead.

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A Study on the Solidification of Heavy Metal Ion by Phosphate Magnesia Cement (인산염 마그네시아 시멘트에 의한 중금속 이온 고정화에 관한 연구)

  • Choi, Hun;Choi, Jung-Ok;Kang, Hyun-Ju;Song, Myong-Shin
    • Proceedings of the Korea Concrete Institute Conference
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    • 2009.05a
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    • pp.321-322
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    • 2009
  • when the polluted soil with heavy metal ions was solidified using magnesia-phosphate cement, heavy metal ions were rarely eluted. Furthermore, the results cf SEM-EDS analysis showed that heavy metal ions in polluted soil turns into insoluble solid solution by magnesia-phosphate cement, it come to have the effect to stabilize heavy metals.

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