Determination of K+ in diluted and undiluted urine with ion-selective electrodes

Jenny, Hans-Beat; Riess, C.; Ammann, D.; Magyar, B.; Asper, R.; Simon, W.

doi:10.1007/bf01196456

Cited by 45 publications

(32 citation statements)

References 15 publications

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“…A second analytical issue is the application of ion-selective potentiometry to urine, which is a complex matrix with variable pH, ionic strength, and cation-anion concentration. Initial studies of ISE methodology in undiluted human urine indicated the presence of anion interference (Jenny et al, 1980;Oesch et al, 1986), which was satisfactorily addressed by diluting the urine sample before analysis (Ladenson, 1979;Jenny et al, 1980). A subsequent study indicated that dilution of urine from cattle, sheep, horses, and cats failed to remove the anionic interference, resulting in underestimation of urinary [K + ] in these species (Brooks et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of 2 portable ion-selective electrode meters for determining whole blood, plasma, urine, milk, and abomasal fluid potassium concentrations in dairy cattle

Megahed

Hiew

Grünberg

et al. 2016

Journal of Dairy Science

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Two low-cost ion-selective electrode (ISE) handheld meters (CARDY C-131, LAQUAtwin B-731; Horiba Ltd., Albany, NY) have recently become available for measuring the potassium concentration ([K(+)]) in biological fluids. The primary objective of this study was to characterize the analytical performance of the ISE meters in measuring [K(+)] in bovine whole blood, plasma, urine, milk, and abomasal fluid. We completed 6 method comparison studies using 369 whole blood and plasma samples from 106 healthy periparturient Holstein-Friesian cows, 138 plasma samples from 27 periparturient Holstein-Friesian cows, 92 milk samples and 204 urine samples from 16 lactating Holstein-Friesian cows, and 94 abomasal fluid samples from 6 male Holstein-Friesian calves. Deming regression and Bland-Altman plots were used to characterize meter performance against reference methods (indirect ISE, Hitachi 911 and 917; inductively coupled plasma-optical emission spectroscopy). The CARDY ISE meter applied directly in plasma measured [K(+)] as being 7.3% lower than the indirect ISE reference method, consistent with the recommended adjustment of +7.5% when indirect ISE methods are used to analyze plasma. The LAQUAtwin ISE meter run in direct mode measured fat-free milk [K(+)] as being 3.6% lower than the indirect ISE reference method, consistent with a herd milk protein percentage of 3.4%. The LAQUAtwin ISE meter accurately measured abomasal fluid [K(+)] compared to the indirect ISE reference method. The LAQUAtwin ISE meter accurately measured urine [K(+)] compared to the indirect ISE reference method, but the median measured value for urine [K(+)] was 83% of the true value measured by inductively coupled plasma-optical emission spectroscopy. We conclude that the CARDY and LAQUAtwin ISE meters are practical, low-cost, rapid, accurate point-of-care instruments suitable for measuring [K(+)] in whole blood, plasma, milk, and abomasal fluid samples from cattle. Ion-selective electrode methodology is not suitable for measuring [K(+)] in bovine urine.

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Section: Introductionmentioning

confidence: 99%

Evaluation of 2 portable ion-selective electrode meters for determining whole blood, plasma, urine, milk, and abomasal fluid potassium concentrations in dairy cattle

Megahed

Hiew

Grünberg

et al. 2016

Journal of Dairy Science

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“…Analyses of ions have been routinely performed using ion-selective electrodes (ISEs) since the 1980s [9][10][11][12]. Simultaneous detection of both Na + and K + is highly desired and has been attempted by using two different ion-selective electrodes [9,13].…”

Section: Introductionmentioning

confidence: 99%

A dual K+–Na+ selective Prussian blue nanotubes sensor

Ang

Nguyễn

Toh

2011

Sensors and Actuators B: Chemical

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“…It was envisaged that chemical bonding of neutral carriers to silicone rubber should be feasible by mixing the silicone rubber precursor with alkoxysilylated neutral carriers prior to silicone-rubber fabrication. This paper describes the design of silicone-rubber membranes modified chemically by crown-ether and calix [4]arene derivatives for Na+-selective electrodes. The electrode properties and some practical applications are also reported.…”

Section: Introductionmentioning

confidence: 99%

Sodium ion-selective electrodes based on silicone-rubber membranes covalently incorporating neutral carriers

Tsujimura¹,

Sunagawa²,

Yokoyama³

et al. 1996

Analyst

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Determination of K+ in diluted and undiluted urine with ion-selective electrodes

Cited by 45 publications

References 15 publications

Evaluation of 2 portable ion-selective electrode meters for determining whole blood, plasma, urine, milk, and abomasal fluid potassium concentrations in dairy cattle

Evaluation of 2 portable ion-selective electrode meters for determining whole blood, plasma, urine, milk, and abomasal fluid potassium concentrations in dairy cattle

A dual K+–Na+ selective Prussian blue nanotubes sensor

Sodium ion-selective electrodes based on silicone-rubber membranes covalently incorporating neutral carriers

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