Neutron activation analysis of copper by substoichiometric extraction wth neocuproine

Radiochemical determination of microgram quantities of lead in acid solutions

“…While GLC has been successfully applied to the analysis of steroids in biological systems, the resolution of steroid epimers has not been possible without the use of polar liquid phases or the requirements for the preparation of a variety of volatile derivatives (11)(12)(13)(14)(15)(16)(17)(18)(19). The application of cholesteric mesophases for the separation of steroid epimers was reported several years ago (20), yet general utility of liquid crystals as stationary phases for such separations has been largely overlooked.…”

Radiochemical extraction of copper with metal-diethyldithiocarbamates

“…Many different procedures have been used to isolate Cu from an activated sample, among which we will note electrolysis (1); amalgamation with mercury (2, 3); exchange with solid CuCNS (4, 5); and extraction with various chelating agents, with an excess (6,7) or with a substoichiometric amount of the reagent (8)(9)(10)(11)(12)(13).…”

Substoichiometric extraction of cations with mixtures of hexafluoroacetylacetone and tri-n-octylphosphine oxide in cyclohexane

“…In a second review, these authors discussed methods published during the period 1968 to 1970 (2). Since this review, several additional solvent extraction methods have been reported (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). A general discussion of substoichiometric methods for multielemental separation by metal chelate extractions (17), a report on the selectivity of substoichiometric extraction methods (18), and a general review of the substoichiometric approach in analysis have also been published (19).…”