| Abstract: | Abstract Four columns have been used experimentally in combination with an electron capture detector, which allowed the determination of 25 DDT-type compounds, some of which have been reported as DDT breakdown products in many biological and nonbiological systems. The liquid phases were 5% QF-i, 5% Igepal, 5% Versamid 900, and 5% DC-11. The solid support for the 4 columns was 80 to 100 mesh Chromosorb W. Optimal temperatures (°C) for the columns were 190 (column), 210 (detector), and 230 (injector port). Optimal nitrogen flow rate was 35 ml/min., for all columns. The trimethylsilyl derivatives of the polar DDT-type compounds, DBH, DDOH, Dicofol, and DDA were successfully gas chromatographed on the column 5% QF-1 and the mixed column 2.5% QF-1 + 2.5% SE-30. |
