Role of Organic Reagents in Chemistry of Specific, Selective, and Sensitive Reactions

Abstract

The chemistry of specific, selective, and sensitive reactions has the following two tasks as its main objectives: (1) the gathering and classification of, and commenting on, experimental findings which are connected, either directly or indirectly, with the specificity, selectivity, and sensitivity of analytical methods.

Fritz Feigl: sua obra e novos campos tecno-científicos por ela originados

“…Reapareceu em "Der Grosse Brockhaus" 6 , no capí-tulo de "Analytisch Chemie". E ele o explicou em detalhe, em seu livro "Specific, Selective and Specific Reactions" (o simplificadamente designado SSS) 7 . A aplicação da química dos complexos de coordenação -introduzida por A. Werner, em 1893 -ao mascaramento e desmascaramento, a fim de obter uma melhora na seletividade de reações químicas não somente foi pioneira 8 , mas ele se tornou altamente especializado, um dos maiores conhecedores da funcionalidade analí-tica em compostos orgânicos, conforme o demonstrou no capítulo de mascaramento, no seu livro SSS e igualmente em duas publicações sobre a correlação dos grupamentos atômicos e a afinidade quí-mica 9,10 .…”

Determination of Chemically Combined Iodine in Sea Water by Amperometric and Catalytic Methods

“…Vinogradov (20) summarizes the results of analyses of oceanic iodine published up to 1933. In 1932, Evans (6) Prior to the development of the catalytic method for the determination of iodine, no method was sensitive enough to permit a direct determination of the clement in sea water. Iodine was concentrated by precipitation, extraction, or distillation from relatively large samples and final estimation was done either calorimetrically or volumetrically.…”

“…In oxidizing the sample with bromine, the pH of the solution should not be less than about pH 2, as Evans (6) has shown that the reaction is reversible in strongly acid solutions and that elemental iodine is lost when the sample is heated too vigorously to remove excess bromine.…”

Contribution à l'étude des entraînements par le Tellure

“…Et l'on doit, comme le suggère FEIGL [4], se livrer à une investigation systématique, en fonction des conditions qui peuvent changer totalement l'aspect des phénomènes. Cette étude détaillée nous a amené à rechercher les mécanismes responsables des coprécipitations envisagées, même lorsqu'elles ne peuvent être utilisées à des fins analytiques.…”