Dual flame photometric detector (DFPD) improvements in the selective GC determination of Cl-containing

Summary

Improvements to the dual flame photometric detector (DFPD) are described which enable the simultaneous selective determination of P-, S- and Cl-containing compounds eluted from a GC column by means of “three channel” operation. The improvements mostly concern the specific detection of the Cl-containing compounds. By controlling the temperature of the indium pellets and the proper choice of air and hydrogen flows, it was possible to improve the detection limit by a factor of ten and reduce the interferences due to P-and S-containing compounds. Detectability, selectivity and linearity are compared with those obtained with an electron capture detector. Some practical applications in the field of pesticide residue analysis are reported.