Spectrophotometric determination of tellurium in trace quantities by use of an ion-association complex.
The formation of an ion-association complex by the interaction of iodotellurate(IV) with cetyltrimethylammonium bromide is used as the basis of an extractive procedure to determine tellurium in the range 2.5-12.5 mug in a final aqueous phase volume of 20 ml. The method is simple, reliable and sensitive. Selectivity is achieved by separation of tellurium on aluminium hydroxide as collector.
Spectrophotometric Determination of Trace Elements
I. INTRODUCTION The rapid and continuous progress in trace analysis is associated with the development of several new techniques and industries, the beginnings of which date back to the years following World War II. Their demands for high purity materials are the main driving force, although the idea of microelements has been known for a long time in biological, agrotechnical, and geological studies, as well as in forensic analysis. Trace analysis is also an excellent analytical tool in the food industry and in environmental pollution and archeological research. As recognized recently, trace amounts of many metals and nonmetals are essential for normal biological processes. On the other hand, some elements are toxic if present in too high concentrations. With so many fields of interest and application, trace analysis has become now the major problem of the day in analytical chemistry.
Studien zur Verteilung von Jodidkomplexen zwischen mineralsauren Lösungen und langkettigen sekundären Aminen (Amberlite LA-2)
ZusammenfassungDie Verteilung einer Reihe von Jodidkomplexen zwischen mineralsauren Lösungen verschiedener Molarität, die 0,1-m an KJ waren, und einer 2%igen Lösung des langkettigen, sekundären Amingemisches Amberlite LA-2 in Xylol wurde untersucht. Auf Grund der erhaltenen Verteilungsverhältnisse wird eine Anzahl von Trennungen verschiedener Elemente vorgeschlagen.SummaryA study has been made of the distribution of a series of iodide complexes between mineral acid solutions of various molarity, that were 0.1M with respect to KI, and a 2% solution in xylene of the mixture of long chain secondary amines known as Amberlite LA-2. A number of separations of various elements is suggested on the basis of the partition coefficients obtained.