A conductometric method for colloid titrations

Tôei, Kyoji; Kohara, Teiji

doi:10.1016/s0003-2670(01)84631-6

Cited by 153 publications

(82 citation statements)

References 3 publications

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“…Ours results show clearly that the maximum adsorption of almost all metal ions studied occurred at pH 4, showing that the removal process was highly dependent on the pH of the metal solutions, which affects the surface charge of the biosorbents and the degree of ionization (6,24).…”

Section: Discussionmentioning

confidence: 72%

“…The degree of deacetylation (D.D.) for microbial chitosan was determined using titration method accordind to Toei and Kohara (24). 0.5 g of chitosan was dissolved in 99.5 g 5% formic acid (v/v).1g of biomaterial/formic acid solution was mixed with distilled water (30 mL).…”

Section: Methodsmentioning

confidence: 99%

“…The D.D. was calculated as follows: D.D.= [X/161/(x/161+Y/203)] x 100 (X = 1/400 x 1/ 1000 x ƒ x 161 x V; where: Y = 0.5 x 1/100 -X; V = titred volume (mL) of n/400 PVSK and ƒ = factor of n/400 PSVK solution (24).…”

Section: Methodsmentioning

confidence: 99%

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Heavy metal biosorption by chitin and chitosan isolated from Cunninghamella elegans (IFM 46109)

Franco

Maia

Porto

et al. 2004

Braz. J. Microbiol.

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Chitin and chitosan were extracted from mycelial biomass of Cunninghamella elegans and the performance for copper, lead and iron biosorption in aqueous solution was evaluated. The growth curve of C. elegans was accomplished by determination of biomass, pH, glucose and nitrogen consumption. Chitin and chitosan were extracted by alkali-acid treatment and the yields were 23.8 and 7.8%, respectively. For the adsorption analysis, the process of heavy uptake metal sorption was evaluated using polysaccharides solutions (1% w/v). The rate of metallic biosorption was dependent upon the concentration and pH of metal solutions, and the best results were observed with pH 4.0. Chitosan showed the highest affinity for copper and chitin for iron adsorption. The results suggest that C. elegans (IFM 46109) is an attractive source of production of chitin and chitosan, with a great potential of heavy metals bioremediation in polluted environments.

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Section: Discussionmentioning

confidence: 72%

Section: Methodsmentioning

confidence: 99%

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Heavy metal biosorption by chitin and chitosan isolated from Cunninghamella elegans (IFM 46109)

Franco

Maia

Porto

et al. 2004

Braz. J. Microbiol.

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“…42 As an indicator for PDADMA (17), 3-(2-hydroxy-3-carboxyanilide-1-azonaphthalene)-4-hydroxybenzenesulfonate (NBS) was proposed: the color change was from red-violet to blue at the end point. 43 Cationic polymeric flocculants such as PDADMA are widely used in waste water treatment and trace amounts of the flocculant can be determined spectrophotometrically with NBS at pH 10 by flow injection analysis.…”

Section: Extraction Of Various Ion-associable Anions By Ferroin and Imentioning

confidence: 99%

Ion-Association Reagents A Review

Tôei

1987

ANAL. SCI.

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“…It is a significant figure that displays the stoichiometry of the titration. 12,13 Figure 4 shows the colloidal titration curve of PHMB-HCl. The end-point was determined by the color change from blue to radish purple at 2 < pH < 5.…”

Section: Colloidal Titrationmentioning

confidence: 99%