دانلود رایگان مقاله روش آنالیز تزریق جریان خودکار برای تعیین مقدار اسید هیومیک

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 (0–2000 mg L1 , R2 : 0.9988) and needs only 10 lL of sample at a flow rate of mobile phase (X1), 2 mL min1 ; pH of mobile phase (X2), 8, and system temperature (X3), 20 C. The limits of detection (LOD) and quantification (LOQ) were calculated as 9.18 mg L1 and 30.60 mg L1 , respectively, and the relative standard deviation (RSD) for 500 mg L1 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. ª 20

4. Conclusion

In this study, quantitative determination of HA in lignite has been successfully obtained over a wide calibration range by the proposed FIA method. The method is rapid, sensitive, provident, and simple as well as avoiding the use of many chemical reagents. It also has great potential for the routine analysis of HA in lignite samples and certification of the commercial HA products obtained from Ilgın lignite. As a result, the proposed FIA method could be used as an alternative to the spectrophotometric method for quantitative determination of HA in lignite. Furthermore, proposed method is capable of making a fully automatic analysis when it is programed.