Qualitative test for potassium using sodium tetraphenylboron

Um método micro-analítico, "spot-test" foi desenvolvido para a determinação de potássio em soro sangüíneo. A precipitação de potássio é feita em meio alcalino com o reagente tetrafenilborato de sódio. A medida turbidimétrica é realizada diretamente com esta solução, sem a necessidade de diluição, usando uma micro-cela turbidimétrica desenvolvida neste trabalho. O soro sangüíneo é misturado com o tampão e a solução do regente analítico. A turbidância é medida num espectrofotômetro à 700 nm. A curva de calibração é uma linha reta, na faixa de concentração de trabalho. O coeficiente de correlação é 0,9998. Os resultados analíticos obtidos com este método foram comparados com aqueles obtidos usando eletrodo seletivo de potássio. Foi observada total concordância entre os dois métodos num nível de confiança de 99%. O desvio padrão relativo médio obtido foi 3,8%.A spot test quantitative turbidimetric method was developed for the determination of potassium in blood serum. The precipitation of potassium is done in basic medium with the classical analytical reagent sodium tetraphenylborate. The measurement of the turbidity is directly performed in this solution without further dilution using a micro-turbidimetric cell developed in this work. Blood serum was mixed with the buffer and the analytical reagent solution. The turbidity is measured in a spectrophotometer at 700 nm. The calibration curve is a straight line in the working concentration range, presenting a correlation coefficient equal to 0.9998. The analytical results obtained with this method were compared with those obtained through the use of a potassium ion selective electrode. Complete agreement was achieved between the two methods at the 99% confidence level. The observed mean RSD was 3.8%.

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“…16,23 Therefore, no interferences of other ions are expected in potassium determination in blood serum, using this reagent.…”

Section: Resultsmentioning

confidence: 93%

Rapid quantitative turbidimetric spot test analysis of potassium in blood serum

Tubino¹,

Souza²,

Höehr³

2004

J. Braz. Chem. Soc.

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“…Methods for the detection and determination of potassium with sodium tetraphenylboratc have been proposed (8,364). Precipitation with sodium tetraphenylboratc is recommended in determining small quantities of potassium (215, 343).…”

Section: Inorganicsmentioning

confidence: 99%

Pharmaceuticals and Related Drugs

Papariello¹,

Slack²,

Mader³

1961

Anal. Chem.

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The Volumetric Determination of Potassium by Heterometric Titration

Ben‐Bassat

Azrad

1971

Israel Journal of Chemistry

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Heterometric procedures for the volumetric determination of potassium are proposed. The use of direct and reverse titrations, precipitate‐forming ligands as titrants, and the addition of solvents like ethanol make possible the determination of a large number of cations and anions as their insoluble compounds. Two procedures are described: one uses direct heterometric titrations for the formation of the potassium tetraphenylboron precipitate (K‐TPB) for samples of concentrations between 40 and 60 ppm K+; the second uses indirect titrations for the formation of K2Na[Co(NO2)6] in acetic acid ‐ ethanol media, for samples containing 4–10 mg K+. The end point of the heterometric titration is obtained by photometric measurement of the optical absorption of suspensions.

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Qualitative test for potassium using sodium tetraphenylboron

Abstract: Sodium tetraphenylboron reacts with potassium ions to form a white insoluble compound.

Cited by 8 publications

References 10 publications

Rapid quantitative turbidimetric spot test analysis of potassium in blood serum

Rapid quantitative turbidimetric spot test analysis of potassium in blood serum

Pharmaceuticals and Related Drugs

The Volumetric Determination of Potassium by Heterometric Titration

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