Analytical reactions with organic reagents

✍ Scribed by Steigmann, A.

• Book ID: 102326225
• Publisher: Wiley (John Wiley & Sons)
• Year: 1946
• Weight: 313 KB
• Volume: 65
• Category: Article
• ISSN: 0368-4075
• DOI: 10.1002/jctb.5000650805

✦ Synopsis

Abstract

New specific or very selective organic reagents are described: acid solutions of thionine for thiosulphates; acid solutions of α‐diketones for ureas, guanidines and nitrates, and mineral acid solutions of resorcinol for nitroso compounds. The resorcinol sugar reaction being interfered with by nitrates and nitrites, attention is drawn to hydrochloric acid solutions of urea and tryptophane for the detection of carbohydrates. New reactions of anionic and cationic wetting agents for earth alkalis and metal acids (e.g. of molybdenum and tungsten) respectively show again the analytical value of soaps and wetting agents. Instead of wetting agents special preparations of anionic and cationic “gelatines” may be of value. ϵ‐Bensylthiuronium chloride in hot ammoniacal solutions, i. e. benzyl mercaptan, was found to be a sensitive and very selective cobalt and nickel reagent.