Chromofoams11Patent pending qualitative and semi-quantitative tests with chromogenic organic reagents immobilized in plasticized open-cell polyurethane foams

• DOI: 10.1016/s0003-2670(01)85467-2
• Publication Date: 2002-07-25T07:14:01Z
• Authors: T. Braun; A.B. Farag
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Polyurethane foams treated with organic reagents in a plasticizer solution can be used for simple, rapid, sensitive, and selective detection and semiquantitative determination of metal ions from dilute aqueous solutions. Batch techniques can be used for simple tests which provide sensitivity as good as, or better than, that attainable by normal spot tests. The application of reagent-treated foam columns for the detection and semiquantitative determination of metal ions from extremely dilute aqueous solutions is advantageous; ions in the p.p.b. range can be detected after passage of 1 l of solution at a fast rate. The use of these techniques for zinc(II) and lead(II) with dithizone, copper(II) with rubeanic acid, and cobalt(II) with thiocyanate-Amberlite LA-l, is described.