Determination of Low Levels of Nitrates in Natural Waters by Direct Potentiometry Using an Ion Selective Electrode of Improved Sensitivity

1997 ◽  
Vol 66 (1) ◽  
pp. 71-78 ◽  
Author(s):  
R. A. S. Lapa ◽  
J. L. F. C. Lima ◽  
E. Barrado ◽  
H. Vela
Keyword(s):  
Natural Waters ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Direct Potentiometry ◽  
Low Levels

Determination of Iodide in Feeds and Plants by Ion-Selective Electrode Analysis

1971 ◽  
Vol 54 (4) ◽  
pp. 760-763
Author(s):  
William L Hoover ◽  
James R Melton ◽  
Peggy A Howard
Keyword(s):  
Ionic Strength ◽  
Solid State ◽  
Necessary Conditions ◽  
Ion Selective Electrode ◽  
Phosphate Solution ◽  
Selective Electrode ◽  
Aoac Method ◽  
Low Levels ◽  
High Concentrations

Abstract A method for determining low levels of iodide in feeds and plants is proposed. The samples are mixed with a 10% phosphate solution to maintain relatively constant ionic strength and pH and analyzed with a solid-state iodide electrode. Ashing is not required and there are no significant interferences by ions commonly found in feeds. The method is accurate in determining iodide content ranging from 10.0 ppm to high concentrations. Necessary conditions for storing and cleaning the electrodes are described. The proposed method is rapid and results compare favorably with AOAC method 7.091.

Determination of sodium with ion-selective electrodes.

1981 ◽  
Vol 27 (8) ◽  
pp. 1435-1438 ◽  
Author(s):  
G B Levy
Keyword(s):  
Whole Blood ◽  
Theoretical Basis ◽  
Protein A ◽  
Ion Selective Electrode ◽  
Flame Photometry ◽  
Ion Selective Electrodes ◽  
Selective Electrode ◽  
Indirect Methods ◽  
Direct Potentiometry

Abstract The advent of ion-selective electrodes made possible the potentiometry of sodium in serum and plasma. These methods were based on dilution of serum, as done in flame photometry, and the results were identical. Analysis of whole blood precludes dilution and so "direct" potentiometry was developed. Results by this technique are variable but tend to compensate for the spurious hyponatremias found by the "indirect" dilution methods due to displacement of volume by lipids and protein. However, there is no unambiguous theoretical basis on which to choose between the various direct ion-selective-electrode techniques and instruments. As an alternative, I propose use of current indirect methods, with numerical correction for the shift in normal sodium values in the presence of abnormal lipid and (or) protein. A table was constructed for making such corrections.

scholarly journals ION-SELECTIVE ELECTRODE FOR DETERMINATION OF METFORMIN IN PHARMACEUTICAL PREPARATIONS

2020 ◽  
pp. 124-129
Author(s):  
Геннадий Иванович Мантров ◽  
Мариана Александровна Феофанова ◽  
Егор Максимович Грачев
Keyword(s):  
Pharmaceutical Preparations ◽  
Ion Pair ◽  
Ion Selective Electrode ◽  
Selective Electrode ◽  
Electroactive Materials ◽  
Direct Potentiometry

Описана конструкция и электроаналитические характеристики ионселективного электрода (ИСЭ) для количественного определения метформина. В качестве электродноактивных соединений в ИСЭ были использованы ионные ассоциаты метформина с фосфорновольфрамовой(ФВК), фосфорномолибденовой(ФМК) и кремний вольфрамовой кислотами (КВК). Проведено потенциометрическое определение метформина в фармацевтических препаратах. The construction and electroanalytical characteristics of ion-selective electrode (ISE) for metformin are described. Ion pair of metformin with heteropolyacids were tested as electroactive materials for ionometric sensor controls. The ISE was used for direct potentiometry of metformin.

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