ISSN:
1573-5036
Keywords:
ammonium lactate-acetic acid extraction
;
cobalt electrode
;
phosphate determination
;
phosphate-selective electrode
;
soil analysis
;
soil extract
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract In soil and environmental science, a sensitive and accurate phosphate sensor would constitute a very useful tool. Several designs, mainly potentiometric and amperometric, have been published, but no commercial sensor exists. Recently, a cobalt electrode has been shown to respond to phosphate in solution. This electrode is extremely simple and robust. In this work, the cobalt electrode applicability to the measurement of phosphate in ammonium lactate-acetic acid (AL) extracts of soils was investigated. The slope of the calibration curve was -30 mV/decade; the linear part corresponded well with the concentration range usually encountered in AL extracts. Dissolved organic substances caused the electrode potential to drift and the extracts were therefore shaken with carbon black prior to measurement. Iron was shown to interfere, most likely by participating in the cathodic electrode reaction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004451308787
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