Determination of Absorbable Organic Halogens in Sludge from Sewage Treatment Plant by Ion Chromatography
An analytical method was developed for the determination of AOF,AOCl,AOBr and AOI in sludge using ion chromatography,with samples pretreated by oscillating adsorption-press filtration,and the amount of activated carbon,the washing mode of activated carbon sludge mixture and the absorption mode of hydrogen halide gas were optimized.The detection limits of AOF(calculated as F),AOCl(calculated as Cl),AOBr(calculated as Br)and AOI(calculated as I)were 0.7,0.6,0.5 and 7.0 mg/kg,respectively.The spiked recoveries of AOF(calculated as F),AOCl(calculated as Cl),AOBr(calculated as Br)and AOI(calculated as I)ranged from79.9％to 119％,with the relative standard deviations(RSD)all below 10％.This method was used to determine AOX in sludge samples from 4 sewage treatment plants in Jiading District,Shanghai.AOF,AOCl and AOI were detected in the sludge of all the four sewage treatment plants,among which the concentration of AOI was the highest(178～336 mg/kg),followed by AOCl(68.8～123 mg/kg)and AOF(58.3～142 mg/kg).AOBr was only detected in one type of sludge,with a concentration of 86.1 mg/kg.This method has a good linear range with sound precision and accuracy,and can be applied to four types of adsorbable organic halogens in sludge.
Ion chromatographyAbsorbable organic halogensSludgeSewage treatment plant
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