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Haloacetic acids (HAAs) are among the disinfection byproducts produced during chlorination ofwater containing natural organic matter and bromide. U.S. Environmental Protection Agency (USEPA) Methods 552.1 and 552.2 used todetermine HAAs require tedious derivatization and multiple extraction steps followed by gaschromatography (GC) with electron capture detection (ECD) and mass spectrometry (MS). Ionchromatography-mass spectrometry (IC-MS and IC-MS/MS) offers a sensitive and selectivealternative that does not require sample pretreatment. Water samples are directly injected into anion chromatograph coupled to a triple quadrupole mass spectrometer. The separation of all 9 HAAsaddressed in USEPA methods is achieved on either a 2 ? 250 mm or 1 ? 250 mm high-capacity ion exchangecolumn using simple hydroxide gradients.Excellent peak resolution and linearity are achieved between 0.4 g/L and 100 g/L in amatrix containing up to 250 mg/L each of chloride and sulfate and 30 mg/L of nitrate. Using13CClH2COOH as an internal standard, the detection limit is less than 0.4 g/L for each of thefive regulated haloacetic acids (HAA5) and less than 1 g/L for the other four. No significantmatrix effects are observed. Recoveries of all nine HAAs are greater than 90% in a simulatedmatrix of the above concentrations.

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Edition: Vol. - No. Published: 11/01/2007 Number of Pages: 1File Size: 1 file , 700 KB