[Determination of five halogenated acetic acids in water using ion chromatography].

The five halogenated acetic acids (HAAs), monochloroacetic acid (MCAA), dichloroacetic acid (DCAA), trichloro acetic acid (TCAA), monobromoacetic acid (MBAA), dibromoacetic acid (DBAA), were separated on an IonPac AS19 column specially designed for oxyhalides, and the separating conditions were optimized. DCAA and nitrite were separated by controlling the temperature. TCAA and sulfate were well separated rapidly by the concentration gradient of mobile phase. The interfering of carbonate (bicarbonate) was eliminated by the method of neutralization vacuum exhausting gas. The experimental results showed that the five HAAs, nitrite, bromide, nitrate, sulfate, etc. can be separated and detected simultaneously, and the detection limits of the DCAA and TCAA were 2.50 microg/L and 3.75 microg/L respectively, and the linearity ranges were from 10.0 to 2000.0 microg/L with the correlation coefficients of 0.999. The method is satisfied for the determination of drinking water.