Selectivity of alginate gel for Cu over Zn when acidic conditions prevail

Jang, Larry K.; Nguyen, Duy V.; Geesey, Gill G.

doi:10.1016/s0043-1354(99)00076-7

Cited by 29 publications

(19 citation statements)

References 9 publications

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“…Moreover, Jang et al have reported the conditional stability constant of the Cu(II)-AA complex at I= 0.01 and pH = 3.4 involving the Langmuir model. 8 In this model, the formation of the 1:1 complex is assumed and the logarithm of the conditional stability constant was evaluated to be 3.52. This value may be in good agreement with the log K1 value for the Cu(II)-AA complex evaluated in the present work (3.79 ± 0.06, I = 0.01).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, Jang and coworkers have evaluated the conditional stability constants of the Cu(II)-and Zn(II)-AA complexes by using a Langmuir model. 8 On the other hand, AA has been known as a polyelectrolyte. There have been many studies on complexation between divalent metal ions and polyelectrolytes.…”

Section: 2mentioning

confidence: 99%

“…Hence, the intrinsic stability constants have to be evaluated under an electrostatic-free condition. 13 Although the conditional stability constants of a few metal-AA complexes have been evaluated, 8 the intrinsic stability constants have not been reported.…”

mentioning

confidence: 99%

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Determination of the Intrinsic Stability Constants of Toxic Divalent Metal Ions to Alginic Acid

Fukushima¹,

Takagi²,

Wada³

2001

ANAL. SCI.

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Alginic acid (AA), which is a polyuronide found in seaweeds, has a strong affinity for a variety of metal ions. 1,2Such a character has been utilized for removing toxic heavy-metal ions from waste water. 3,4 The stability constants of metal-AA complexes may be useful to calculate the distribution of metal species for a variety of ligand concentrations and pH. There have been numerous studies on the affinity of metal ions to AA. 5-7 Nevertheless, little has been known about the stability constants of the metal-AA complexes. Recently, Jang and coworkers have evaluated the conditional stability constants of the Cu(II)-and Zn(II)-AA complexes by using a Langmuir model. 8 On the other hand, AA has been known as a polyelectrolyte. There have been many studies on complexation between divalent metal ions and polyelectrolytes. [9][10][11][12] Gregor and coworkers have shown that Bjerrum's method may be applied to divalent metal-polyelectrolyte systems. 9,10 However, in evaluating the stability constants for metal-polyelectrolyte complexes, a large electrostatic field should be considered. Hence, the intrinsic stability constants have to be evaluated under an electrostatic-free condition. 13 Although the conditional stability constants of a few metal-AA complexes have been evaluated, 8 the intrinsic stability constants have not been reported.In a previous study, 14 we determined some physicochemical parameters in terms of the AA molecule that were utilized for applying to the electrostatic model. In the present study, the conditional stability constants of the divalent metal-AA complexes were determined based on a modified Bjerrum's method at a variety of ionic strengths. Subsequently, the intrinsic stability constants were evaluated by extrapolating the conditional stability constants to the electrostatic-free condition involving the electrostatic model. ExperimentalThe AA was purchased from Nacalai Tesque INC (Kyoto, Japan). Sodium nitrate (99% purity, Nacalai Tesque INC) was used to adjust the ionic strength (I). Cu(NO3)2·3H2O, Pb(NO3)2 (Wako Pure Chemicals, Osaka, Japan) and Ni(NO3)2·6H2O (Nacalai Tesque INC) were used to prepare the stock solutions of metal ions. The concentrations of the stock solutions were determined by ICP-AES (SPS 3000S type, Seiko Denshi). The standard solutions for Cu 2+ , Ni 2+ and Pb 2+ (1000 ppm) were purchased from Nacalai Tesque INC. The stock solutions of metal ions were freshly prepared in each experiment.To 50 mg of AA in a 100-ml ground-glass stoppered Erlenmeyer flask, a 30-ml volume of CO2-free water containing metal ions (1 mM) and NaNO3 (I = 0.01 -1.0) was added. After shaking for 12 h under an argon atmosphere at 25˚C, the mixture was placed into a polyethylene titration cell. Titration was carried out under an argon atmosphere, and the temperature of the cell was maintained at 25.00 ± 0.19˚C. An AUT-501 auto-titration system (TOA Electronics Ltd., Tokyo) was used by connecting with a GST-5311-type glass electrode (TOA Electronics Ltd.). The titrant was a 0.01 M NaOH aqueous solu...

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Section: Resultsmentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

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Determination of the Intrinsic Stability Constants of Toxic Divalent Metal Ions to Alginic Acid

Fukushima¹,

Takagi²,

Wada³

2001

ANAL. SCI.

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“…Entrapment in beads of calcium alginate gel is one of the most widely used techniques for immobilising bacteria (Scott et al, 1989), enzymes (Hussain et al, 1985), yeast (Bustard and McHale, 1997;Serp et al, 2000), algae (Crist et al,1994), animal cells (Lu et al, 2000). On the other hand, calcium alginate has been one of the most extensively investigated biopolymers for binding divalent heavy metals thus, it has been used for the removal of heavy metals from dilute aqueous solutions (Apel and Torma 1993;Araújo and Teixeira, 1997;Chen et al, 1997;Chen et al 1992;Ibañez and Umetsu, 2002;Jang et al, 1999;Lázaro et al, 2003;Veglio et al, 2002). Recently, the potential use of grape stalks wastes entrapped in calcium alginate beads for Cr(VI) removal from aqueous solutions has been studied.…”

Section: Introductionmentioning

confidence: 99%

Chromium (VI) uptake by grape stalks wastes encapsulated in calcium alginate beads: equilibrium and kinetics studies

Fiol

Poch

Villaescusa

2004

Chemical Speciation & Bioavailability

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“…Ионы меди селективно адсорбируются аль-гинатами [60]. В работе [61] к альгинатному гелю добавляли полистеренсульфонат (NaPSS) для улуч-шения сорбирующей емкости в отношении меди, однако введение в состав альгинатов клеток циано-бактерии Microcystis sp. способствовало значительно-му увеличению количества адсорбированной меди.…”

Section: биоизъятие тяжелых металловunclassified

Immobilized microalgae in biotechnology

Vasilieva

Лобакова

Lukyanov

et al. 2016

Moscow Univ. Biol.Sci. Bull.

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Рассматривается иммобилизация клеток оксигенных фототрофных микроорганиз-мов -цианобактерий и эукариотических микроводорослей -в природе и в искусствен-ных системах. В обзоре подчеркивается, что существование клеток микроорганизмов в прикрепленном состоянии, например, в составе биопленок, является широко распро-страненной в природе стратегией, обеспечивающей выживание клеток. Таким образом, искусственно иммобилизованные клетки оксигенных фототрофных микроорганизмов можно рассматривать как особую группу биомиметических материалов. Особое внимание уделено изучению влияния различных способов иммобилизации на физиологическое состояние клеток цианобактерий и микроводорослей, их устойчивость к стрессовым воз-действиям, а также продуктивность культур, находящихся в иммобилизованном состоя-нии. В обзоре проводится анализ преимуществ и недостатков современных методов им-мобилизации и используемых в настоящее время носителей. Освещаются возможности применения иммобилизованных культур оксигенных фототрофных микроорганизмов в различных областях биотехнологии, таких как получение биомассы и ценных метаболи-тов, сбор биомассы, очистка водных акваторий и сточных вод от тяжелых металлов, из-бытка биогенных элементов и органических загрязнителей.

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Selectivity of alginate gel for Cu over Zn when acidic conditions prevail

Cited by 29 publications

References 9 publications

Determination of the Intrinsic Stability Constants of Toxic Divalent Metal Ions to Alginic Acid

Determination of the Intrinsic Stability Constants of Toxic Divalent Metal Ions to Alginic Acid

Chromium (VI) uptake by grape stalks wastes encapsulated in calcium alginate beads: equilibrium and kinetics studies

Immobilized microalgae in biotechnology

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