New Zealand Journal of Agricultural Research abstracts
Development and modelling of a soil nitrate and potassium
simultaneous rapid detection system based on ion selective electrodes
Lin Jianhan
Wang Maohua*
Zhang Miao
Zhang Yane
Key Laboratory on Modern Precision Agriculture System Integration
Research
China Agricultural University
Mailing Box 125
No. 17 Tsinghua East Road
Beijing, PR China
*Author for correspondence: wangmh@cau.edu.cn
Abstract Conventional soil nitrate and
potassium detection
methods are reliable, but time-consuming and expensive. Rapid
lower-cost detection methods for soil nitrate and potassium are
urgently needed. In this study, a temperature-calibrated soil nitrate
and potassium rapid simultaneous detection system was developed based
on two ion-selective electrodes (ISEs). At room temperature, the
potentiometric experiments were conducted to evaluate the performance
of both ISEs and simple linear regression (SLR) was used for modelling.
The lower detection limits of both ISEs were 1 × 10–5
mol/litre with regression coefficients of 0.994 and 0.997,
respectively. Under different temperatures, the potentiometric
experiments were conducted and multiple SLRs were used for
temperature-calibrated modelling with a maximum relative error of c. 6%
and c. 10%, respectively. An ISE signal acquisition system was
developed based on a microprocessor, including an ISE signal
conditioning unit and a temperature measurement unit using a thermal
resistor. This study might be suitable for in-field soil nitrate and
potassium rapid detection application.
Keywords ion selective electrode; nitrate;
potassium; soil
nutrient ion concentration rapid detection; soil testing
A07072; Online publication date 17 December 2007 Received and
accepted 10 August 2007
New Zealand Journal of Agricultural Research, 2007, Vol. 50:
635–640
0028–8233/07/5005–0635 © The Royal Society of New Zealand 2007
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