Determination of haloacetic acids in hospital e uent after chlorinationby ion chromatography
SUN Ying-xue , GU Ping
DOI:
Received September 08, 2006,Revised December 25, 2006, Accepted , Available online
Volume 19,2007,Pages 885-891
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The ion chromatography combined solid phase extraction (SPE) method was developed for the analysis of low concentration
haloacetic acids (HAAs), a class of disinfection by-products formed from chlorination of hospital wastewater. The monitored HAAs
included monochloroacetic acid, monobromoacetic acid, dichloroacetic acid, dibromoacetic acid and trichloroacetic acid. The method
employed a sodium hydroxide eluent at a flow rate of 0.8 ml/min, electrolytically generated gradients, and suppressed conductivity
detection. To analyze the HAAs in real hospital wastewater samples, C18 pretreatment cartridge was utilized to reduce samples’
turbidity. Preconcentration with SPE and matrix elimination with treatment cartridges were investigated and found to be able to obtain
acceptable detection limits. Linearity, repeatability and detection limits of the above method were evaluated. The detection limits of
monobromoacetic acid and dibromoacetic acid were 2.61 g/L and 1.30 g/L, respectively, and the other three acids are ranging from
0.48 to 0.82 g/L under 25-fold preconcentration. When the above optimization procedure was applied to three hospital wastewater
samples with di erent treatment processes in Tianjin, it was found that the dichloroacetic acid was the major compound, and the growth
ratios of the HAAs after disinfection by sodium hypochlorite were 91.28%, 63.61% and 79.50%, respectively.
