Application of a Spectroscopic Analysis-Based Portable Sensor for Phosphate Quantitation in Hydroponic Solutions. (24th June 2020)

• Record Type: Journal Article
• Authors: Han, HeeJo; Jung, Dae-Hyun; Kim, Hak-Jin; Lee, Taek Sung; Kim, Hyoung Seok; Kim, Ho-Youn; Park, Soo Hyun
• Other Names: Martinez-Olmos Antonio Academic Editor.
• Is Part Of: Journal of sensors. Volume 2020(2020)
• Publication Date: 2020-06-24
• Subjects: Detectors -- Periodicals; 681.205
• DOI: 10.1155/2020/9251416
• Languages: English
• ISSNs: 1687-725X

Abstract

Abstract : Hydroponic plant culturing requires the concentration of nutrients in the supplied solution to be maintained at a constant level. For example, phosphate ion concentration directly affects crop growth, which necessitates the development of convenient and rapid techniques for on-site phosphate quantitation. Herein, we developed a new low-cost colorimetric method of quick on-site phosphate quantitation based on a modification of the conventional molybdenum colorimetric method. Specifically, the nutrient solution treated with ascorbic acid and molybdate was analyzed by colorimetric method after 10 min incubation, and a phosphate quantitation protocol was proposed. To verify this protocol, 50 nutrient solution samples with concentrations of 0–200 ppm were used to develop a model and perform a validation experiment, and the PLSR (Partial Least Squares Regression) and PCR (Principal Component Regression) models were developed and validated using a crossvalidation method and sample transmission spectra. The PLSR model, employing smoothing preprocessing at a 5 nm wavelength spacing, exhibited the best prediction performance and showed an error of ~10% within the measurement range during verification. In addition, an artificial neural network-based model achieved R 2 = 0.93 for the training set and R 2 = 0.86 for the validation set. Finally, we developed convenient-to-use software for phosphate ion quantitation by the presented method and performed a demonstration test.