Paper Info
Title
A Co-Nanoparticles Modified Electrode For On-Site And Rapid Phosphate Detection In Hydroponic Solutions
Abstract
Conventional strategies for determining phosphate concentration is limited in efficiency due to the cost, time, and labor that is required in laboratory analysis. Therefore, an on-site and rapid detection sensor for phosphate is urgently needed to characterize phosphate variability in a hydroponic system. Cobalt (Co) is a highly sensitive metal that has shown a selectivity towards phosphate to a certain extent. A disposable phosphate sensor based on the screen-printed electrode (SPE) was developed to exploit the advantages of Co-nanoparticles. A support vector machine regression model was established to predict the concentration of phosphate in the hydroponic solutions. The results showed that Co-nanoparticles improve the detection limit of the sensor in the initial state. Meanwhile, the corrosion of Co-nanoparticles leads to a serious time-drift and instability of the electrodes. On the other hand, the coefficient of variation of the disposable phosphate detection chip is 0.4992%, the sensitivity is 33 mV/decade, and the linear range is 10(-1)-10(-4.56) mol/L. The R-2 and mean square error of the buffer-free sensor in the hydroponic solution are 0.9792 and 0.4936, respectively. In summary, the SPE modified by the Co-nanoparticles is a promising low-cost sensor for on-site and rapid measurement of the phosphate concentration in hydroponic solutions.
Year
DOI
Venue
2021
10.3390/s21010299
SENSORS
Keywords
DocType
Volume
phosphate, buffer-free sensor, Co-nanoparticles, on-site and rapid, hydroponic solutions
Journal
21
Issue
ISSN
Citations 
1
1424-8220
0
PageRank 
References 
Authors
0.34
0
6
Name
Order
Citations
PageRank
Feng Xu100.34
Peng Wang200.34
Shiyuan Bian300.34
Yuliang Wei400.34
Deyi Kong502.70
Huanqin Wang600.34