Evaluation of certified reference materials for oxidation–reduction titration by precise coulometric titration and volumetric analysis

Asakai, Toshiaki; Kakihara, Yoshihiro; Kozuka, Yasuharu; Hossaka, Sadao; Murayama, Mariko; Tanaka, Tatsuhiko

doi:10.1016/j.aca.2006.03.033

Cited by 21 publications

(10 citation statements)

References 8 publications

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“…Electrical conductivity (EC) was determined applying the principle of electromagnetic induction using EM38 equipment (Geonics Ltd., Canada). The potassium dichromate volumetric method-external heating method was used to determine the soil organic matter content (Asakai et al, 2006). The KCl extraction method was used to determine the ammonium nitrogen (NH 4 + -N) and nitrate nitrogen (NO 3 À -N) in the soil (Li et al, 2012).…”

Section: Analysis Of Soil Chemical Propertiesmentioning

confidence: 99%

Soil nematode communities and functions: Ecological package restoration responses in damaged desert steppe open‐pit mining ecosystems

Gao

Zi-ying

et al. 2022

Land Degrad Dev

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Ecological restoration of open-pit mine wasteland is critical to the sustainable development of the mining industry. Using high-throughput sequencing, we analyzed soil properties and nematode community structure and function to evaluate the impact of ecological package restoration on the quality of underground ecosystem reclamation in desert steppe open-pit mine wasteland. After 7 years of ecological package restoration at an open-pit quarry, two management methods (annual removal of dominant plant genera and annual reseeding of missing plants) achieved the expected outcomes of the restoration project (return to the conditions of the pre-disturbed ecosystem). Based on LEfSe multi-level discriminant analysis and shared genera analysis, we suggest that Oxydirus, Dorylaimus, Trichotylenchus, Plectus, Scutylenchus, Paratylenchus, Tylencholaimus, and Cephalobus may be the key soil nematode genera in the damaged open-pit quarry ecosystem. We also evaluated the soil health status of different ecological package restoration time periods (2 and 5 years) at an abandoned desert steppe open-pit iron mine by analysis of the soil properties and nematode communities. We suggest that ecological package restoration for 5 years achieved the expected restoration outcomes in the open-pit iron mine wasteland. Based on LEfSe analysis and shared genera analysis, we suggest that Acrobeles, Microdorylaimus, Cehalobus, Tripylina, and Ecumenicus may be the key soil nematode genera in the damaged open-pit iron mine ecosystem. Our findings provide a reference for evaluating the reclamation effect of ecological package restoration in open-pit mine areas.

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Section: Analysis Of Soil Chemical Propertiesmentioning

confidence: 99%

Soil nematode communities and functions: Ecological package restoration responses in damaged desert steppe open‐pit mining ecosystems

Gao

Zi-ying

et al. 2022

Land Degrad Dev

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“…3) Path B − redox back titration with iron(II) standardized with standard potassium dichromate Excess iron(II) standardized with potassium dichromate is added to oxidants, and then the excess iron(II) is back-titrated with potassium dichromate [6].…”

Section: Principle Of Titrimetric Reactionsmentioning

confidence: 99%

Characterization of oxyanions of chlorine by multipath titrimetric approach for drinking water quality control

Asakai

2022

J. Phys.: Conf. Ser.

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The analysis of oxyanions, perchlorate, chlorate, chlorite and hypochlorite ions, is of interest, especially from the viewpoint of evaluating drinking water quality. Instrumental analyses are generally performed to quantify them, and require a standard solution of corresponding ions; however, no standard solutions characterized by a metrologically valid procedure have existed. In the present study, perchlorate, chlorate and chlorite ions were characterized by performing multipath titration techniques. This technique is an approach to determine the amount of substances in chemicals by employing different stoichiometric reactions. It has decreased the risk and the contribution of unknown biases that each measurement method has, and gives further reliable results than those based on a conventional single titration method. The comprehensive evaluation of the measurement uncertainties for these assays was carried out, resulting in the establishment of the measurement methodologies for oxyanion standards.

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“…Based on Faraday's law, the coulometric assay yields the precipitation reaction factors on an absolute basis without any chemical standards, and highly precise results compared with other chemical methods. There are some reports regarding a coulometric study for acidimetric standards, [3][4][5][6][7][8] oxidimetric-reductometric standards, [9][10][11][12][13][14] and precipitation standards. [15][16][17][18][19][20][21] Hioki et al reported on the dependence of the coulometric titration results on the amount of sample mass due to the influence by carbon dioxide for acidimetry.…”

Section: 2mentioning

confidence: 99%

Influence of AgCl Precipitates on the Precipitation Titration of Sodium Chloride by Constant-Current Coulometry

et al. 2006

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The precipitation titration of sodium chloride with electrogenerated silver ion was studied. The production of a precipitate of silver chloride had a significant effect on the titration results because the precipitate involved unreacted chloride or unreacted silver ion. The accuracy of the method was investigated by changing the introduction time of a sodium chloride solution to the coulometric cell during the process of electrolysis, and examining the dependency on the sample size. The accuracy of the measurement of the precipitation titration is discussed.

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Evaluation of certified reference materials for oxidation–reduction titration by precise coulometric titration and volumetric analysis

Cited by 21 publications

References 8 publications

Soil nematode communities and functions: Ecological package restoration responses in damaged desert steppe open‐pit mining ecosystems

Soil nematode communities and functions: Ecological package restoration responses in damaged desert steppe open‐pit mining ecosystems

Characterization of oxyanions of chlorine by multipath titrimetric approach for drinking water quality control

Influence of AgCl Precipitates on the Precipitation Titration of Sodium Chloride by Constant-Current Coulometry

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