LIUZi-jing,LIHong-yan,WANGXin,et al.Identification and Quantification of Humic Acid Based on K-Nearest Neighbor Algorithm Combined with Fluorescence Spectra[J].China Water & Wastewater,2022,38(23):56-62.
Identification and Quantification of Humic Acid Based on K-Nearest Neighbor Algorithm Combined with Fluorescence Spectra
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第23期
Page:
56-62
Column:
Date of publication:
2022-12-01
- Keywords:
- humic acid; steady/transient fluorescence spectrometer; K-nearest neighbor algorithm; drinking water; source water
- Abstract:
- It is of great significance to identify and quantify humic acid in drinking water and source water for the control of disinfection byproducts. Therefore, the fluorescence characteristic values such as FI, BIX and HIX information of humic acid were extracted by steady/transient fluorescence spectrometer, and K-nearest neighbor (KNN) algorithm characteristic model was introduced to establish the fluorescence spectra-KNN algorithm to identify the humic acid species in water samples. On this basis, the linear relationship between fluorescence intensity and mass concentration of homogeneous humic acid standard materials was quantified. The detection limits of six humic acid reference substances in water samples were 0.001-0.002 mg/L, the limits of quantification were 0.003-0.006 mg/L, and the precision, accuracy and standard recovery were 0.29%-1.80%, 1.3%-3.6% and 86.5%-110%, respectively. All of them met the quantitative requirements of analytical chemistry. Under the condition of accurate qualification and reliable data, the humic acid types and concentrations of 14 kinds of drinking water and source water samples were analyzed by the fluorescence spectra-KNN algorithm. The humic acid in the water samples under investigation belonged to the same standard substance as 1R110N, among which the humic acid concentration in source water was 1.922-9.157 mg/L, and the humic acid concentration in the treated water was 0.382-2.108 mg/L. The removal rates of humic acid in the water treatment plants were 44.02%-83.78%. The results proved that the method had universal applicability in application and promotion.
Last Update:
2022-12-01