Han, HeeJo Jung, Dae-Hyun Kim, Hak-Jin Lee, Taek Sung Kim, Hyoung Seok Kim, Ho-Youn Park, Soo Hyun 2024-01-19T17:30:33Z 2024-01-19T17:30:33Z 2021-09-04 2020-06-24 1687-725X https://pubs.kist.re.kr/handle/201004/118511 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 similar to 10% within the measurement range during verification. In addition, an artificial neural network-based model achievedR(2)=0.93for the training set andR(2)=0.86for the validation set. Finally, we developed convenient-to-use software for phosphate ion quantitation by the presented method and performed a demonstration test. English HINDAWI LTD Application of a Spectroscopic Analysis-Based Portable Sensor for Phosphate Quantitation in Hydroponic Solutions Article 10.1155/2020/9251416 1 JOURNAL OF SENSORS, v.2020 JOURNAL OF SENSORS 2020 scie scopus 000552018800001 2-s2.0-85087982517 Engineering, Electrical & Electronic Instruments & Instrumentation Engineering Instruments & Instrumentation Article 스마트팜 센서 인산이온 토마토