ELECTRON-CAPTURE NEGATIVE-ION (ECNI) MASS-SPECTROMETRY OF COMPLEX-MIXTURES OF CHLORINATED DECANES AND DODECANES - AN APPROACH TO ECNI MASS-SPECTRA OF CHLORINATED PARAFFIUS IN TECHNICAL MIXTURES

The electron capture negative ion (ECNI) mass spectra of two complex m ixtures of polychlorinated decanes (PCDe) and polychlorinated dodecane s (PCDo) are presented. The number of isomers in these mixtures is sti ll high but is drastically reduced in comparison to technical products of chlorinated paraffins (CP), due to their fixed chain length. As a result, the mass spectra are simplified and less complex. Different mo des of negative ion formation were observed in the spectra of the PCDe and PCDo. [M+Cl](-) adduct ions were the most abundant ions in the sp ectra of lower chlorinated molecules. Higher chlorinated isomers forme d prominently [M-Cl](-) and [M-HCl](-) fragments besides [M+Cl](-). Po ssible consequences fur the determination of chlorinated paraffins by ECNI-MS that result from the variation in ion formation are addressed.