Investigation on drying conditions and assays of amidosulfuric acid and sodium carbonate by acidimetric coulometric titration and gravimetric titration

Asakai, Toshiaki; Hioki, Akiharu

doi:10.1007/s00769-010-0646-0

Cited by 17 publications

(18 citation statements)

References 18 publications

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“…The instruments used for the coulometric titrations were the same as those described previously. 19 The coulometric titration cell was a horizontal type with two intermediate compartments separated by three sintered glass filters placed between the generator-electrode and the counter-electrode chambers to avoid any loss of analyte or titrant as a result of diffusion from the generator-electrode chamber. The procedure for the coulometric titration of Ce(IV) was carried out in a similar manner to that previously reported for potassium dichromate.…”

Section: Methodsmentioning

confidence: 99%

Precise coulometric titration of cerium(iv) as an oxidising agent with electrogenerated iron(ii) and reliability in cerium(iv) standardisation with sodium thiosulfate

Asakai

Hioki

2012

Anal. Methods

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Cerium(IV) is a useful strong oxidising agent and is often standardised against thiosulfate. In the standardisation, triiodide liberated by Ce(IV) in an acidic potassium iodide solution can be titrated with thiosulfate to determine the concentration of Ce(IV). The accuracy of the standardisation has not been established because the iodine liberation process is not well-understood. In the present study, to evaluate the iodine liberation process, Ce(IV) was assayed through two different methods: precise coulometric titration with electrogenerated ferrous ions and gravimetric titration with thiosulfate independently determined by precise coulometric titration with electrogenerated iodine. The reliability of Ce(IV) standardisation with thiosulfate is discussed on an absolute basis by coulometric titrations of both Ce(IV) and thiosulfate solutions. Finally, the accurate determination of Ce(IV) was achieved by both methods. Information on the stability of Ce(IV) solutions is also presented.

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Section: Methodsmentioning

confidence: 99%

Precise coulometric titration of cerium(iv) as an oxidising agent with electrogenerated iron(ii) and reliability in cerium(iv) standardisation with sodium thiosulfate

Asakai

Hioki

2012

Anal. Methods

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“…The current efficiency of the coulometric titration with electrogenerated cerium(IV) was not very high; however, it was found that the titration efficiency was sufficient to assay an iron(II) solution. The instruments for coulometric titration were described in detail previously, 31 and are briefly described here. A salt bridge was silicic acid gel, which was prepared from sodium silicate and sulfuric acid.…”

Section: Methodsmentioning

confidence: 99%

“…The results and uncertainties for the gravimetric titration are described in this section. The general procedure of gravimetric titration was the same as that for acid-base titration described in the past report, 31 unless otherwise stated in the present paper.…”

Section: Standardization Of Iron(ii) By Gravimetric Titration With Pomentioning

confidence: 99%

Evaluation of the Stability of Iron(II) Solutions by Precise Coulometric Titration with Electrogenerated Cerium(IV)

Asakai

Hioki

2012

ANAL. SCI.

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“…Traditionally the sodium carbonate, is used to calibrate acid and for DIC concentration determination (Cox et al ; Dickson et al 2007), but it has not been rigorously evaluated for use as an isotopic standard. It can be dried at high temperatures, up to 300°C, and any bicarbonate salts that may be contaminating the sample will decompose to carbonates (Yoshimori and Sakaguchi ; Asakai and Hioki ). The dried sodium carbonate will pick up moisture from the air and needs to be stored in a desiccator immediately after drying (Dickson et al 2007).…”

Section: Assessmentmentioning

confidence: 99%

Seawater DIC analysis: The effects of blanks and long‐term storage on measurements of concentration and stable isotope composition

Olack

Colman

Pfister

et al. 2018

Limnology & Ocean Methods

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Dissolved inorganic carbon (DIC) concentration and stable isotope composition measurements (d 13 C) are central to the study of biological and chemical processes in the ocean. We examined a small volume (1 mL) method using continuous-flow isotope ratio mass spectrometry (CF-IRMS) for making both measurements in a single sample run. Prior exploration of this approach has yielded variable results. Effects of concentration, isotopic composition, storage time, and the gas used to flush the sample tubes were tested using standard solutions. Multiple isotopic composition standards permitted calculation of an apparent blank that develops due to slow rates of gas exchange through the septum. A blank correction is applied to the d 13 C measurements, giving precision and accuracy better than 0.1& after 6 months of storage and 0.2& after 18 months of storage. CF-IRMS concentration measurements on field samples collected near Tatoosh Island, off the Pacific coast of Washington, U.S.A., were compared to independent measurements (Dickson, CDQC Laboratory, UCSD) on the same water, the latter approach involving collection of 500 mL of seawater fixed with mercuric chloride. Concentration measurements by CF-IRMS on seawater samples (precision 1-2%) are correctable to the Dickson results, though scatter in this relation exceeds analytical precision. The DIC and d 13 C measurements on coastal seawater, in conjunction with salinity measurements, indicated strong effects of biological activity on carbon dynamics relative to possible effects of mixing water masses. In sum, this small volume methodology has application to field situations and laboratory experiments where larger volumes are logistically challenging and storage space is limited.

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Investigation on drying conditions and assays of amidosulfuric acid and sodium carbonate by acidimetric coulometric titration and gravimetric titration

Cited by 17 publications

References 18 publications

Precise coulometric titration of cerium(iv) as an oxidising agent with electrogenerated iron(ii) and reliability in cerium(iv) standardisation with sodium thiosulfate

Precise coulometric titration of cerium(iv) as an oxidising agent with electrogenerated iron(ii) and reliability in cerium(iv) standardisation with sodium thiosulfate

Evaluation of the Stability of Iron(II) Solutions by Precise Coulometric Titration with Electrogenerated Cerium(IV)

Seawater DIC analysis: The effects of blanks and long‐term storage on measurements of concentration and stable isotope composition

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