Metrolab Blog

BTEX Analysis Even Better with Dynamic Headspace

BTEX (Benzene, Toluene, Ethylbenzene, o,m,p-Xylene) represents a group of volatile organic compounds (VOCs) and exists as gases at atmosphere pressure. Due to its water solubility, it’s classified as water contaminant and it’s also hazardous to health.
The recovery of VOCs analysis in water differs depending on sample preparation. Its high volatility decreases the recovery with LLE (Liquid/Liquid Extraction) or SPME (Solid Phase Micro Extraction). So, VOCs analysis commonly goes with Headspace or Purge & Trap sample preparation but the U-shaped sparger of Purge & Trap can be easily contaminated when it comes to analyzing waste water including some particles, which finally reduces the accuracy.
So, it’s better to prepare the sample in Headspace, especially Dynamic Headspace when analyzing trace level of VOCs or semi-VOCs.
This study shows comparisons between Static Headspace with Dynamic Headspace according to EPA method 8260 Volatile Organic Compounds by GC/MS (Gas Chromatograph/Mass Spectrometer) using YL6900 GC/MS system with YL PAL System including Static Headspace and Dynamic Headspace (ITEX).