Optimization of the determination of polar organic halogeen compounds by coulometry
Optimaliseren van een methode voor de microcoulometrische bepaling van polaire organohalogeenverbindingen
Fokkert L, Cleven RFMJ, Versteegh JFM
RIVM Report 714301006
The usual methods to determine organohalogenic compounds such as extractable organohalogens (EOX), adsorbable organohalogens (AOX) and purgeable organohalogens (POX) do not measure all polar compounds. A procedure is developed for the coulometric measurement of polar compounds in water. Samples with polar compounds are acidified to pH 1,5 and adsorbed on the resin XAD-4. The inorganic halogens are removed by washing with nitrate solution. The XAD-4 columns are eluted with acetone. After combustion of the organohalogens in a furnace, the halogen content is measured coulometrically. The procedure is tested with trichloroacetic iced (TCA). The recovery by the AOX determination was about 25%, whereas the recovery by the new procedure was about 100%.