Inexpensive ion-selective electrodes for the simultaneous monitoring of potassium and nitrate concentrations in nutrient solutions

Analytical Methods ◽

10.1039/d1ay00956g ◽

2021 ◽

Author(s):

Marina Miras ◽

María S. García ◽

Vicente Martínez ◽

Joaquín A. Ortuño

Keyword(s):

Major Ions ◽

Potentiometric Method ◽

Ion Selective Electrodes ◽

Nitrate Concentrations ◽

Nutrient Solutions

A fast, simple and inexpensive potentiometric method has been developed for the determination of the major ions potassium and nitrate in nutrient solutions, by means of ion-selective electrodes (ISEs) based...

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Determination of Nitrate in Forages by Using Selective Ion Electrode: Collaborative Study

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/69.2.196 ◽

1986 ◽

Vol 69 (2) ◽

pp. 196-198 ◽

Cited By ~ 1

Author(s):

Michael P Carlson ◽

Norman R Schneider ◽

◽

R Everson ◽

J Johnson ◽

...

Keyword(s):

Collaborative Study ◽

Potentiometric Method ◽

Selective Electrode ◽

Coefficients Of Variation ◽

Nitrate Concentrations

Abstract Each of 10 collaborating laboratories analyzed 4 blind duplicate pairs of forage samples for nitrate, by using a potentiometric method. Two forage controls and a 100 000 mg KNO3/L standard were also provided. Nitrate was extracted into an aqueous Al2(SO4)3 solution containing 70 mg KNO3/L and quantitated with a nitrate-selective electrode. Standards were prepared using extracting solution as diluent. Nitrate concentrations in forage samples ranged from <0.50 to 4.35% KNO3. Repeatability coefficients of variation (CV0) ranged from 1.74 to 3.61%, and reproducibility coefficients of variation (CV1) ranged from 6.92 to 7.66%. Mean recovery of a 0.55% KNO3 spike was 94.5%. The method has been adopted official first action.

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