Abstract
Under specific instrumental conditions, the alkali flame detector will give negative peaks for chlorine-containing compounds, and positive peaks for Br-, I-, N-, or P-containing compounds. In such a mode, the detector can be used for qualitative and quantitative determination of chlorides. It discriminates against carbon compounds by approximately three orders of magnitude, detecting a minimum amount of 1 ng of chlorobenzene. The negative response can be used to detect chlorinated hydrocarbon pesticide residues in soil at levels between 0.01 and 10 p.p.m. without purification of an exhaustive hexane extract.
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