Determination of Oxalate Ion and Calcium Ion by Indirect Colorimetry

Burriel-Martí, F.; Ramírez-Muńoz, J.; Fernández-Caldas, Enrique

doi:10.1021/ac60076a013

Cited by 15 publications

(3 citation statements)

References 7 publications

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“…The resulting green color of the Cr3+ ion is an indication of the presence of manganese(II) (15). A method for the determination of calcium(II) or C2042by indirect colorimetry has been developed by observing the decrease in optical density when the iron (III)salicylate complex is treated with oxalate (65). The formation of Co(C204)38-, as the basis for a spectrophotometric method, has been employed for the macrodetermination of cobalt.…”

Section: Thermal Decomposition Of Solid Oxalatesmentioning

confidence: 99%

The Chemistry of the Metal Oxalato Complexes.

Krishnamurty¹,

Harris²

1961

Chem. Rev.

181

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Section: Thermal Decomposition Of Solid Oxalatesmentioning

confidence: 99%

The Chemistry of the Metal Oxalato Complexes.

Krishnamurty¹,

Harris²

1961

Chem. Rev.

181

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“…Analysis of Filtrate. The oxalate ion concentration of the filtrate was determined using the complexometric method of Burriel-Marti et al 10 There is a decrease in optical density when a ferric salicylate complex is treated with oxalate ions. The decrease in optical density with increasing oxalate ion concentration obeys Beer's law.…”

Section: Methodsmentioning

confidence: 99%

Effect of Calcium and Magnesium Ions on Calcium Oxalate Formation in Sugar Solutions

Doherty

2005

Ind. Eng. Chem. Res.

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During the concentration of sugarcane juice, there is continuous deposition of nonsugar impurities on the surface of evaporator units. Because the scale deposit has a low thermal conductivity, its accumulation impairs heat transfer and eventually renders the process uneconomical owing to reduced throughput. Calcium oxalate is the main intractable scale formed in factories that process sugarcane. It is not removed by conventional chemical cleaning methods. This paper describes studies on the apparent solubility product of calcium oxalate in the presence of sugar and calcium and magnesium ions at different temperatures and pH's. A solubility product model was obtained that states that the apparent solubility product of calcium oxalate decreases with increasing temperature and sugar concentration, but increases with increasing pH. The model was able to predict calcium oxalate solubility changes in raw sugarcane factory processes, indicating that the apparent solubility product of calcium oxalate declines rapidly through the evaporator set. The results also indicated that calcium oxalate solubility is increased in the presence of calcium and, in particular, magnesium ions.

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“…A single IP28 multiplier phototube with an attenuated beam gives a photometer which alternately measures the radiant energy transmitted by sample and reference solutions. With the lead sulfide cell for the near-infrared region the Cary Model 14 will record from 190 Iron(II) salicylate (83,383) oxalyldihydrazone Chloranilic acid (335) Water Cuproine (190,246) Disodium 3-(4-chloro-l- Nitroso-R salt (472) Ethylenediaminetetraacetic acid (204,511) Dimethylglyoxime (256,470) 2-Nitroso-l-naphthol-4-suIfonic (667) Nitrilotriacetic acid (454) Ethylenediaminetetraacetic acid ( 443 µ to 2.6 microns. The scanning speed can be adjusted from 0.5 to 500 A. per second (8).…”

Section: Physicsmentioning

confidence: 99%