Detection and identification of trace amounts of chlorine organic substances


Detection and identification of trace amounts of chlorine organic
substances by gas chromatography-high-resolution mass spectrometry

A.А. Shelepchikov*, E.S. Brodsky

The target search and identification of organochlorine compounds in the soil with abnormally high octachlorodibenzo-p-dioxin level from the northern province of Vietnam were carried out using high-resolution mass spectrometry on magnetic sector mass spectrometer in the total ions current recording and multi-ion detection modes with resolving power 8000–10 000. An algorithm for determining the exact mass, molecular formula and molecular structure of organochlorine substances at ultra-trace concentrations was proposed. Twenty eightorganohalogen compounds, 22 of which are derivatives of polychlorinated dibenzo-p-dioxins and polychlorinated biphenyl ethers containing  from one  to  three methoxy groups were  found;  the concentration  range of  these compounds  is 0.0001–0.5% relative  to octa  chlorodibenzo-p-dioxin level. The existence of these compound classes as polychlorinated dibenzo-p-dioxin or other chlorinated aromatic compounds metabolites was previously assumed, but most of  the  found  substances have never been described previously . Some of  the compounds could be  theoretically considered as possible biotransformation products of octahlorodibenzop-dioxin; the others have a different origin, and may be by-products of natural formation of octahlorodibenzo-p-dioxin.