Investigation of iodine liberation process in redox titration of potassium iodate with sodium thiosulfate

Asakai, Toshiaki; Hioki, Akiharu

doi:10.1016/j.aca.2011.01.021

Cited by 22 publications

(36 citation statements)

References 17 publications

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“…The experimental set-ups and the procedures of coulometric titrations for potassium dichromate and a sodium thiosulfate solution were described previously [7,[13][14][15]. As described in the previous report [13], high purity potassium dichromate as a certified reference material (CRM) was established by coulometric titration with electrogenerated Fe(II).…”

Section: Methodsmentioning

confidence: 99%

“…Constant voltage was applied between the platinum pair, and the current was monitored. The current had good proportionality to the amount of liberated iodine [7]. A dual platinum-plate electrode (each 5 mm × 5 mm) was used in gravimetric titration to increase sensitivity as described previously [7,[13][14][15].…”

Section: Methodsmentioning

confidence: 99%

“…The authors reported an accurate standardization procedure for a sodium thiosulfate solution with potassium iodate [7].…”

Section: Introductionmentioning

confidence: 99%

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Reliability in standardization of sodium thiosulfate with potassium dichromate

Asakai

Hioki

2015

Microchemical Journal

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Reliability in standardization of sodium thiosulfate with potassium dichromate

Asakai

Hioki

2015

Microchemical Journal

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“…The basic requirement is 100 % current efficiency of the titrant generation at the working electrode caused by a well-defined electrode reaction. In the National Metrology Institutes (NMIs), the main type of coulometry is high-precision, constant-current coulometry that was first developed by Taylor and Smith [27] as an analytical technique for certifying primary reference materials [6,[24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Metrological evaluation of the certification of primary reference materials characterized by high-precision constant-current coulometry for the reliability of the titration analyses

Borges

Silva

2014

J Appl Electrochem

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The use of pure materials in chemical analysis is currently in high demand due to the need to provide reliable measurement results. In the Electrochemistry Laboratory of the National Institute of Metrology from Brazil (Inmetro) is located the primary system of coulometry, which is considered the standard of the measurement for the amount of substance. The main function of this primary system is to certify primary reference materials to ensure reliability and metrological traceability for titration analyses. Some important certified reference materials (CRMs), homogeneous, stable, and characterized with an accurate property value have been developed. This work aims to present the stages for certifying the primary reference materials in a metrological approach: potassium hydrogen phthalate for acid-base titration, potassium chloride for precipitation titration, and potassium dichromate for redox titration. In addition, the key comparisons that were necessary to demonstrate the national traceability structure's equivalence for these CRMs' international recognition will be shown.

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“…The iodine consumption in the processes of gold leaching and gold adsorption was evaluated by a redox titration method which is based on the oxidation of iodide into iodine in the presence of sodium thiosulfate and starch indicator [20,21]. The redox reaction in the solution can be illustrated as below:…”

Section: Consumption Of Iodine In Leaching and Adsorptionmentioning

confidence: 99%

Leaching and Adsorption of Gold from Waste Printed Circuit Boards Using Iodine-Iodide Solution and Activated Carbon

Altansukh

Haga

Narankhuu

et al. 2016

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Abstract. Iodine-iodide leaching and activated carbon adsorption processes for recovery of gold (Au) from waste printed circuit boards (WPCBs) were discussed in this paper. A pressure oxidative acid leaching (POAL) was carried out in an autoclave using diluted sulfuric acid (1 M H2SO4) solution in order to remove high concentrations of some base metals especially copper (Cu), aluminum (Al), iron (Fe) and zinc (Zn) due to their negative effects on gold dissolution from WPCBs. The factors affecting the performance and efficiency of the iodine-iodide leaching process; such as iodine/iodide concentration, pulp density, leaching time and leaching temperature were optimized in order to maximize the gold dissolution efficiency from the WPCBs in the iodine-iodide solution. Results indicated that the vast majority (> 99 %) of gold was dissolved in the solution from the WPCBs under the optimized leaching conditions. Adsorption tests were conducted on leach liquor solution resulting from the iodine-iodide leaching using activated carbon. Nearly 98 % of gold was adsorbed from the liquor solution onto the carbon under the conditions optimized in this study. The results obtained revealed that gold can be successfully recovered from this secondary resource, where the percent recovery amounts to nearly 97 % for gold.

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Investigation of iodine liberation process in redox titration of potassium iodate with sodium thiosulfate

Cited by 22 publications

References 17 publications

Reliability in standardization of sodium thiosulfate with potassium dichromate

Reliability in standardization of sodium thiosulfate with potassium dichromate

Metrological evaluation of the certification of primary reference materials characterized by high-precision constant-current coulometry for the reliability of the titration analyses

Leaching and Adsorption of Gold from Waste Printed Circuit Boards Using Iodine-Iodide Solution and Activated Carbon

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