• Title/Summary/Keyword: Sodium bisulfite

Search Result 46, Processing Time 0.093 seconds

Determination of Trace Iodide in Sodium Bisulfite Aqueous Solution by Ion Chromatography with UV Detection (이온크로마토그래피를 이용한 Sodium bisulfite 수용액 중의 미량 요오드 정량)

  • Park, Yang-Soon;Kim, Do-Yang;Choi, Kwang-Soon;Park, Soon-Dal;Han, Sun-Ho
    • Analytical Science and Technology
    • /
    • v.13 no.3
    • /
    • pp.304-308
    • /
    • 2000
  • The iodide was recovered from a simulated spent fuel to the sodium bisulfite aqueous solution. It was discussed that the trace iodide (below 1 ppm) was determined without the matrix effect of 0.1 M sodium bisulfite and 1 mM $HNO_3$ in aqueous solution by ion chromatography with UV detection. AS4A-SC (DIONEX) column and UV-absorption spectrophotometer were used. The UV-absorption spectra of sodium bisulfite, nitric acid and iodide were obtained, and then 230 nm was selected as an absorption wavelength for iodide determination. 0.1 M NaCl eluent was optimum condition. In this condition the calibration curve of iodide was obtained on the range of about 0-1,000 ppb. The linear coefficient was 0.99993 and the detection limit was 5 ppb. The relative standard deviation was 1.26%.

  • PDF

A Study of Characteristics Variation of Thermally Expandable Microspheres in Post-polymerization Treatment by Various Initiators

  • You, Hae Na;Kim, Ji Hoo;Kim, Myeong Woo;Kim, Keon Il;Park, Hyun Duk
    • Elastomers and Composites
    • /
    • v.52 no.3
    • /
    • pp.211-215
    • /
    • 2017
  • Thermally expandable microspheres were used as post-treatment initiators of potassium persulfate, sodium bisulfite, and sodium sulfide in order to improve the foaming ability and whiteness when foaming a mixture of thermally expandable microsphers and poly(vinyl chloride). Potassium persulfate showed no significant influence on the foaming behavior, foam expansion, whiteness, and yellowing, whereas in the case of using sodium bisulfite. In particular, sodium bisulfite demonstrated the best efficiency with 2 wt% treatment. The thermally expandable microspheres prepared herein can provide excellent foamability and whiteness, and are expected to be applicable in various fields such as general coating and wallpaper.

The Effects of Sulfite Salts on the Shelf-life of Low-salted Myungranjeot (Soused Roe of Alaska Pollack) (Sulfite 염에 의한 저염 명란젓의 보존 효과)

  • Kim, Sang-Moo
    • Korean Journal of Food Science and Technology
    • /
    • v.28 no.5
    • /
    • pp.940-946
    • /
    • 1996
  • One of the biggest Problems in making jeotkal is the reduction of its shelf-life when lowering the salt content from 20-30% to below 10%. Therefore, in order to extend the shelf-life of the low-salted jeotkal, prior to setting the minimum allowance value of sulfiting agents as food additives for fermented fish products, the preservative effects of sulfite salts on the low-salted myungranjeot (soused roe of Alaska pollack) were studied through various chemical and microbial analyses. The pHs of the low-salted Myungranjeot treated with bisulfite and metasulfite salts rapidly decreased in the biginning of fermentation, while the lactic acid contents increased constantly. Sodium bisulfite and metasulfite enhanced the production of $NH_2-N$ after 10 day-fermentation, whereas they inhibited the production of VBN, TMA and TBA, and the growth of microorganisms including fungi during fermentation. The estimated shelf-lives of low-salted myungranjeot treated with control, sodium sulfate, sodium bisulfite, and sodium metasulfite on the basis of VBN 50 mg% were about 16, 14, 20 and 24 days, respectively.

  • PDF

Ultrasound Mediated, Sodium Bisulfite Catalyzed, Solvent Free Synthesis of 6-Amino-3-methyl-4-substitued-2,4-dihydropyrano[2,3-c]pyrazole-5-carbonitrile

  • Darandale, Sunil N.;Sangshetti, Jaiprakash N.;Shinde, Devanand B.
    • Journal of the Korean Chemical Society
    • /
    • v.56 no.3
    • /
    • pp.328-333
    • /
    • 2012
  • A simple, convenient and practical green synthetic protocol for sodium bisulfite catalyzed multicomponent reaction of ethyl acetoacetate, hydrazine hydrate, malononitrile, and various aldehydes for the synthesis of 6-amino-4-phenyl-3-methyl-2,4-ihydropyrano[2,3-c]pyrazole-5-carbonitriles using ultrasound irradiations in solvent free condition. This method provides the advantage of operational simplicity, shorter reaction time and excellent yields making the protocol environment friendly and economically lucrative.

Synthesis of Wood Adhesive Derived from the Milk Protein and the Blocked Isocyanate

  • Ha, Yuna;Lee, Sang-Min;Lee, Hyang-Yeol
    • Journal of the Korean Applied Science and Technology
    • /
    • v.30 no.3
    • /
    • pp.551-559
    • /
    • 2013
  • To investigate the adhesion effect of sodium bisulfite content in making blocked isocyanate, wood adhesive PB-1, PB-2, PB-3 and PB-4 containing sodium bisulfite content of 15%, 22.5%, 30% and 37.5% were synthesized respectively. As a result, when the amount of sodium bisulfite increased in adhesives, the tensile strength was found to be proportionally increased. The final adhesive mixtures were manufactured using a two-components system which are prepared by mixing two separate protein and BI solutions due to the precipitate in the adhesives. As PVA was added to adhesives to increase tenacity, the plywood dehiscence phenomenon after cold pressing process was declined. By addition of PVA, the tensile strength was improved up to $6.5{\sim}7kgf/cm^2$ with BI/protein ratio from 1:6 up to 1:8. Phase separation between milk fat and aqueous layer was disappeared after addition of emulsifier, Tween 20. Additon of Tween 20 showed tensile strength up to $5{\sim}6.5 kgf/cm^2$ at NCO/protein ratio of 1:12 ~ 1:14 without phase separation.

A novel method of surface modification to polysulfone ultrafiltration membrane by preadsorption of citric acid or sodium bisulfite

  • Wei, Xinyu;Wang, Zhi;Wang, Jixiao;Wang, Shichang
    • Membrane and Water Treatment
    • /
    • v.3 no.1
    • /
    • pp.35-49
    • /
    • 2012
  • In membrane processes, various agents are used to enhance, protect, and recover membrane performance. Applying these agents in membrane modification could potentially be considered as a simple method to improve membrane performance without additional process. Citric acid (CI) and sodium bisulfite (SB) are two chemicals that are widely used in membrane feed water pretreatment and cleaning processes. In this work, preadsorptions of CI and SB were developed as simple methods for polysulfone ultrafiltration membrane modification. It was found that hydrogen bonding and Van Der Waals attraction could be responsible for the adsorptions of CI and SB onto membranes, respectively. After modification with CI or SB, the membrane surfaces became more hydrophilic. Membrane permeability improved when modified by SB while decreased a little when modified by CI. The modified membranes had an increase in PEG and BSA rejections and better antifouling properties with higher flux recovery ratios during filtration of a complex pharmaceutical wastewater. Moreover, membrane chlorine tolerance was elevated after modification with either agent, as shown by the mechanical property measurements.

Stabilization of Doxorubicin Hydrochloride in Injections (염산 독소루비신 주사액의 안정화)

  • Lee, Sang-Cheol;Nam, Sang-Cheol;Kim, Chun-Seong;Shin, Hyun-Jong;Paik, Woo-Hyun
    • Journal of Pharmaceutical Investigation
    • /
    • v.24 no.3
    • /
    • pp.109-113
    • /
    • 1994
  • Effects of various formulation factors using $L_8$ orthogonal arrays with the stability of doxorubicin hydrochloride injections(DHls) were investigated. The degradation of DHI may be occured by pH, temperature, light and metal ions. It is known that DHI should be stored on refrigerated condition of $4{\sim}8^{\circ}C$ because of its unstability on the room temperature. The employed factors were sodium chloride as isotonic solution, sodium bisulfite or sodium pyrosulfite as an antioxidant, disodium edetate as a chelating agent, methyl parahydroxybenzoate as a dissolution time shortening agent, and hydrochloric acid or citric acid as a pH adjusting agent at $22^{\circ}C$. From the results of $L_8$ orthogonal arrays, an optimal formula, including sodium chloride, disodium edetate, sodium bisulfite and hydrochloric acid, was obtained and the shelf-life of the formula was determined as 560 days approximately.

  • PDF

Preparation and Application Characteristics of Carboxylated Styrene Butadiene Latex for Latex Modified Concrete (라텍스 개질 콘크리트용 Carboxylated Styrene Butadiene 라텍스의 제조와 적용 특성)

  • Lee, Bong-Kyu;Ju, Chang-Sik
    • Korean Chemical Engineering Research
    • /
    • v.50 no.6
    • /
    • pp.1076-1081
    • /
    • 2012
  • For the purpose of development of the latex suitable for latex modified concrete, experimental researches on the preparation of carboxylated styrene butadiene latex by the method of the two-step emulsion polymerization and application to concrete were performed. Sodium dodecylbenzene sulfonate and sodium salt of lauryl sulfonate were selected as anionic emulsifiers, and nonylphenoxy poly(ethyleneoxy) ethanols (n=10, 20, 40) as latex stabilizer. Potassium persulfate and sodium bisulfite were used as redox initiator, besides $Na_2HPO_4$ and $K_2CO_3$ as electrolytes. Polymerization recipe of latex suitable for latex modified concrete were suggested from the experimental researches on the effects of anionic emulsifiers and their concentration on the polymerization stability, and the effect of electrolytes concentration on the particle size of latex. Physical properties, such as slump, air contents, compressive and flexural strength, of latex prepared by suggested polymerization recipe were examined. The experimental results showed that latex modified concrete satisfied the quality standards in slump and air contents. Furthermore, it was turned out that the compressive and the flexural strength of latex modified concrete with 28 days curing time showed appreciably improvements.

The Effects of Resist Agents on the Resist-Discharge Behaviors of C.I. Reactive Black 5 in the Resist-Discharge Printing of Cotton Fabrics with Reactive/Reactive Dyes (반응/반응염료에 의한 면직물 방발염에 있어 C.I. Reactive Black 5의 방발염 거동에 미치는 방염제의 영향)

  • Park, Geon Yong
    • Textile Coloration and Finishing
    • /
    • v.8 no.1
    • /
    • pp.8-14
    • /
    • 1996
  • In resist-discharge printing of cotton fabrics with reactive/reactive dyes the effects of both resist agents, benzaldehyde sodium bisulfite(BASB) and glyoxal sodium bisulfite (GSB), and Rongalite on the resist-discharge behaviors of C.I. Reactive Black 5(B1-5), which is disazo type and has two vinylsulfone groups, were investigated. It was confirmed that BASB and GSB were effective resist agents, and about 4% of BASB or about 6% of GSB was proper to obtain successful white or colored resist-discharge results. It was thought that the good resist-dischargeability of BASB was due to the hydrophobicity of bezene in BASB, and also that of GSB resulted from the structural effects caused by two hydroxy groups in GSB and the ease of washing of unactivated reactive dye. Only 5% Rongalite without any resist agents showed good resist-discharge result, but 1~3% Rongalite with 4% BASB brought about the stain of cotton fabric by reddish monoazo products produced by insufficient cleavage of two azo groups in Bl-5.

  • PDF

Preparation and Application Characteristics of Carboxylated Styrene Butadiene Latex for Polymer Cement Mortar (폴리머 시멘트 몰타르 포장재용 Carboxylated Styrene Butadiene 라텍스의 제조와 적용 특성)

  • Lee, Bong-Kyu;Ju, Chang-Sik
    • Korean Chemical Engineering Research
    • /
    • v.50 no.5
    • /
    • pp.789-794
    • /
    • 2012
  • For the purpose of development of the latex suitable for polymer cement mortar, experiments on the preparation of carboxylated styrene butadiene latex by the method of the two-step emulsion polymerization were performed. Methyl methacrylate, methacrylic acid and acrylic acid were selected as carboxylic co-monomer, styrene and butadiene as monomer, sodium dodecylbenzene sulfonate and sodium salt of lauryl sulfonate as anionic emulsifiers, and nonylphenoxy poly (ethyleneoxy) ethanol (n=10, 20, 40) as latex stabilizer. Potassium persulfate and sodium bisulfite were also used as redox initiator, and sodium monohydrogen phosphate and potassium carbonate as electrolytes. The effects of categories and concentration of carboxylic co-monomer, molecular weight control agent, crosslinking agent, and styrene/butadiene monomer ratio on the characteristics of latex were investigated. Polymerization recipes for preparation of polymer cement mortar could be proposed. The prepared latexes were tested for the physical properties such as compressive and flexural strength when latexes were mixed with cement mortar. The results showed that the latex could be adapted to polymer cement mortar. Also, it was recognized that the compressive and flexural strength were exhibited 25.4% and 45.3% respectively higher improvement than the quality standards at 28 days curing time.