Anal. Chem. 1999, 71, 2739-2744
Selective Determination of TNT in Soil Extracts by Sequential Injection Spectrophotometry Roger T. Echols,†,‡ Marcy M. Christensen,†,§ Ryan M. Krisko,†,§ and Joseph H. Aldstadt, III*,|
Division of Science and Mathematics, University of Minnesota-Morris, Morris, MN 56267, Department of Chemistry, University of Wisconsin-Milwaukee, 3210 N. Cramer Street, Milwaukee, WI 53211
A rapid sequential injection spectrophotometric method for the selective determination of 2,4,6-trinitrotoluene (TNT) in soil samples is presented. The method is based on a derivatization reaction of TNT with sodium sulfite in a basic acetone medium. The reaction conditions, namely the percentage of acetone used in the reaction, the sample and reagent volumes, the mixing coil volume, and the reaction time, were optimized. The reaction was found to be particularly sensitive to the concentration of acetone; an acetone/water medium of 88% (v/v) acetone was found to be optimal. A study of the response of the method to other explosives demonstrated that the method is selective for TNT. In particular, it was shown that the method had little (
