New Japanese certified reference materials for electrolytic conductivity measurements

Asakai, Toshiaki; Maksimov, I. I.; Onuma, Sachiko; Suzuki, Toshihiro; Miura, Tsutomu; Hioki, Akiharu

doi:10.1007/s00769-017-1253-0

Cited by 12 publications

(8 citation statements)

References 17 publications

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“…Вплив цих параметрів на зміну опору може бути теоретично оцінений і врахований, застосовуючи поправку. В основі конструкції двохелектродної комірки кварцова трубка 1 довжиною L та внутрішнім діаметром D. На торцях трубки закріплені дискові металеві електроди 2 з виводами 5 для під'єднання вимірювача опору 6, що дає змогу вимірювати активну складову повного імпедансу стовпа рідини Re(Z) у відповідності до рівнянь (2,3). На боковій поверхні трубки зроблено два отвори 3 діаметром d та вклеєні два патрубки 4, що розташовані від краю трубки на відстані x. Під час обчислення опору стовпа рідини в середині трубки будемо вважати, що об'єкт є однорідним за складом (з постійною концентрацією електроліту) та ізотропним середовищем і, отже в системі рівнянь (4) параметр k -const.…”

Section: рисunclassified

“…Комірки другого типу використовуються в НМІ США, Данії, Італії, Словаччини та Японії. Принципи їхньої побудови та варіанти зовнішнього вигляду докладно розглянуто у [2,3]. Найбільш простими за конструкцією залишаються комірки третього типу.…”

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Calculation of Corrections of Differential Two-Electrode Conductivity Cells With Calculated Constant

Mikhal¹,

Meleshchuk²,

Stennik³

2023

Teh. elektrodin.

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The object of study is a differential two-electrode conductivity cell with a calculated constant, designed for the practical realization of the unit of length – a meter in national measurement standards of electrolytic conductivity of liquids. The differential cell consists of two tubes of the same diameter but different lengths. The article presents an idealized model for calculating cell constants and determining electrolytic conductivity. The presence of holes for filling the cell, caus-ing a distortion of the uniformity of the current density distribution in the middle of the cell, and a significant dielectric permeability of aqueous solutions lead to significant errors when measuring the resistance of liquid columns. The arti-cle presents mathematical expressions for calculating two types of corrections. First, the correction caused by the dis-tortion of the field uniformity due to the presence of the inlet and outlet holes of the cell. Secondly, the correction caused by the presence of bias currents in aqueous solutions of electrolytes. The appearance of a differential cell based on two tubes with a diameter of 9 mm and a length of 50 and 100 mm, respectively, which is being tested as a part of the national measurement standard of Ukraine, is given. References 7, figures 5, tables 2.

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Section: рисunclassified

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Calculation of Corrections of Differential Two-Electrode Conductivity Cells With Calculated Constant

Mikhal¹,

Meleshchuk²,

Stennik³

2023

Teh. elektrodin.

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“…Several designs of such cells are known, which are used as primary ones. The most popular among national metrology institutes (NMIs) are Jones-type cells with a removable central extension tube [1][2][3][4][5][6][7] and cells with a moving electrode [6][7][8][9][10]. Regardless of the cell design, the method for measuring EC remains the same.…”

Section: Introductionmentioning

confidence: 99%

“…The method is implemented by measuring the difference in resistance between two liquid columns of the same diameter but different lengths. Thus, the basis of a cell of any design [1][2][3][4][5][6][7][8][9][10] is always the electrical resistance of a virtual liquid column with a known geometry, which ultimately determines the cell constant. For an idealized model (figure 1), the constant can be easily calculated by its geometric parameters L (m) and D (m), but the question arises of how to fill such a cell with liquid.…”

Section: Introductionmentioning

confidence: 99%

Resistance bias estimation of a liquid column in a cylindrical conductivity cell with lateral liquid supply

Stennik,

Mikhal

2024

Eng. Res. Express

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The article shows an idealized model of a cylindrical two-electrode conductivity cell with inletand outlet holes for filling located perpendicular to the cell axis. Based on the finite elementmethod (FEM), the non-uniformity of the current density distribution inside the cell wasdetermined. For a range of geometrical parameters of the cell, the resistance biases of the liquidcolumn with respect to the idealized model—a cell with a uniform current density distribution(without holes) are calculated. A mathematical expression is given that describes calculatingthe electrolytic conductivity value using the geometrical parameters of a conductivity cell,taking into account the field distortion caused by holes for filling. It has also been found that atthe ratio of the cell diameter to the hole diameter D/d ≥ 5, the entire field distortion inside thecell is provided by a liquid column in the holes with a length of only (h ≤ d) mm. Theoreticalestimates and mathematical models highlighted in this article were used in the creation of theprimary differential conductivity cell. Structurally, such a cell consists of two tubes of the samediameter but of different lengths, at the edges of which platinized electrodes are placed.

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“…This design was first proposed and developed at the National Institute of Standards and Technology (NIST, Gaithersburg) more than 30 years ago [18]. However, even at the present stage, such a principle is used in the establishment of national measurement standards, for example, at the National Metrology Institute of Japan (NMIJ) [5]. The central extension tube of such a cell can be removed in order to shorten the distance between the electrodes, thereby reducing the liquid column resistance, or it may be put back, thereby increasing the resistance.…”

Section: Introductionmentioning

confidence: 99%

Methodological errors due to a non-cylindrical surface in a Jones-type cell with a removable center extension tube

Stennik,

Mikhal,

Meleshchuk

2023

Acta IMEKO

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The article shows an idealized model of a Jones-type cell with a removable central extension tube. Two main factors leading to the cylindricity distortion of the inner surface of the cell are considered. These are radial displacement and tube diameter inequality. Based on the finite element method (FEM), errors in measuring the resistance of a liquid column caused by the non-uniformity of the current density distribution inside the cell were determined. The methodological error with respect to the idealized model was estimated for each factor separately and in combination. The Authors show that at a radial displacement of 0.6 mm, the error can reach 0.1 %. The same error value occurs when the inequality of the diameters is only 20 μm.

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New Japanese certified reference materials for electrolytic conductivity measurements

Cited by 12 publications

References 17 publications

Calculation of Corrections of Differential Two-Electrode Conductivity Cells With Calculated Constant

Calculation of Corrections of Differential Two-Electrode Conductivity Cells With Calculated Constant

Resistance bias estimation of a liquid column in a cylindrical conductivity cell with lateral liquid supply

Methodological errors due to a non-cylindrical surface in a Jones-type cell with a removable center extension tube

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