A chemometric study: Automated flow injection analysis method for the quantitative determination of humic acid in Ilgın lignite

Abstract

A rapid, sensitive and provident flow injection analysis (FIA) method was developed within the framework of a chemometric approach for the quantification of humic acid (HA) in the lignite obtained from Ilgın, Konya, Turkey. The proposed method allows automatic determination of 60 samples per hour over a wide calibration range (0–2000mgL−1, R2: 0.9988) and needs only 10μL of sample at a flow rate of mobile phase (X1), 2mLmin−1; pH of mobile phase (X2), 8, and system temperature (X3), 20°C. The limits of detection (LOD) and quantification (LOQ) were calculated as 9.18mgL−1 and 30.60mgL−1, respectively, and the relative standard deviation (RSD) for 500mgL−1 HA was calculated as 3.44 (n: 9). It was revealed that the standard deviation (SD) values of the proposed FIA method are lower than those of the spectrophotometric method.