Compliant AOX and AOF Analysis in Water Samples per DIN 38409-59
Organohalogens are widespread, persistent compounds with potential toxicity to humans and the environment. However, techniques used to monitor adsorbable organic halogens (AOX) typically can only determine the total of organically bound chlorine, bromine and iodine. These techniques cannot provide separate results for AOCl, AOBr, AOI or organoflour (AOF) content, respectively.
Analysis of halogenated organic compounds in environmental samples is a mandatory parameter in many countries. For this purpose, the total AOX (adsorbable organic bound halogens) parameter is used to determine the amount of adsorbable organically bound chlorine, bromine and iodine in water samples. Current DIN ISO 9562 and EPA Method 1650 standards describe the determination of AOX through adsorption followed by combustion and microcoulometric titration. However, the use of titration as a detection technique allows only the determination of AOX expressed as chlorine, but does not allow the determination of separate fractions of AOCl, AOBr and AOI or AOF (adsorbable organic bound fluorine).
The new DIN 38409-59 method describes a validated method for comprehensive AOX analysis including AOF using Combustion Ion Chromatography (CIC). Analysis with CIC enables the determination of separate concentrations of adsorbable organic bound fluorine, chlorine, bromine and iodine in different water samples as well as the total parameter, thus filling the gaps left by DIN ISO 9562 and EPA Method 1650.
Key advantages of AOX analysis with CIC:
- Provides selective determination of AOF, AOCl, AOBr and AOI in water samples
- Offers rapid non-target screening capability for PFAS (AOF)
- Combustion Ion Chromatography (CIC) delivers automatic, accurate and efficient analysis
- Reliable results are achieved with a complete CIC system from a single supplier
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