Haloacetic acids are produced as by-products of chlorination in the water treatment purification process. Three haloacetic acids, monochloroacetic acid (MCAA), dichloroacetic acid (DCAA), and trichloroacetic acid (TCAA), are subject to water quality standard for drinking water with established limits (MCAA: 0.02 mg/L, DCAA: 0.04 mg/L, TCAA: 0.2 mg/L) by Japan Ministry of Health, Labour and Welfare. The specified test method (Notificated Method) for these 3 haloacetic acid compounds requires solvent extraction followed by methylation using diazomethane, and then quantitation by GC/MS.
On November 18, 2011, public comment was requested concerning the addition of LC/MS(/MS) as a new test method for haloacetic acids. This Application News introduces an example of analysis of the 3 haloacetic acids using the LCMS-8030 triple quadrupole mass spectrometer and is in accordance with this legislative measure.