An Optimized Analytical Method for the Simultaneous Detection of Iodoform, Iodoacetic Acid, and Other Trihalomethanes and Haloacetic Acids in Drinking WaterReport as inadecuate




An Optimized Analytical Method for the Simultaneous Detection of Iodoform, Iodoacetic Acid, and Other Trihalomethanes and Haloacetic Acids in Drinking Water - Download this document for free, or read online. Document in PDF available to download.

An optimized method is presented using liquid-liquid extraction and derivatization for the extraction of iodoacetic acid IAA and other haloacetic acids HAA9 and direct extraction of iodoform IF and other trihalomethanes THM4 from drinking water, followed by detection by gas chromatography with electron capture detection GC-ECD. A Doehlert experimental design was performed to determine the optimum conditions for the five most significant factors in the derivatization step: namely, the volume and concentration of acidic methanol optimized values  = 15%, 1 mL, the volume and concentration of Na2SO4 solution 129 g-L, 8.5 mL, and the volume of saturated NaHCO3 solution 1 mL. Also, derivatization time and temperature were optimized by a two-variable Doehlert design, resulting in the following optimized parameters: an extraction time of 11 minutes for IF and THM4 and 14 minutes for IAA and HAA9; mass of anhydrous Na2SO4 of 4 g for IF and THM4 and 16 g for IAA and HAA9; derivatization time of 160 min and temperature at 40°C. Under optimal conditions, the optimized procedure achieves excellent linearity R2 ranges 0.9990–0.9998, low detection limits 0.0008–0.2 µg-L, low quantification limits 0.008–0.4 µg-L, and good recovery 86.6%–106.3%. Intra- and inter-day precision were less than 8.9% and 8.8%, respectively. The method was validated by applying it to the analysis of raw, flocculated, settled, and finished waters collected from a water treatment plant in China.



Author: Xiaolin Liu , Xiao Wei , Weiwei Zheng , Songhui Jiang, Michael R. Templeton, Gengsheng He, Weidong Qu

Source: http://plos.srce.hr/



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