Spectrophotometric determination of perchlorate after extraction of its brilliant green ion-pair with microcrystalline benzophenone

Perchlorate (0–30 μg) can be determined spectrophotometrically at 639 nm after its adsorptive extraction with Brilliant Green on microcrystalline benzophenone at pH 6.5 after dissolution of the solid phase in benzene. The effects of pH and diverse ions are reported. The system is applied to the determination of ? 0.003% (w/w) perchlorate in samples of potassium chlorate after prior destruction of chlorate.     

Partial Hyperbolicity, Lyapunov Exponents and Stable Ergodicity

We present some results and open problems about stable ergodicity of partially hyperbolic diffeomorphisms with non-zero Lyapunov exponents. The main tool is local ergodicity theory for non-uniformly hyperbolic systems.     

On topological tits buildings and their classification

We define topological Tits buildings. If a topological building Δ satisfies some technical conditions and is irreducible, compact, locally connected and satisfies the topological equivalent of the Moufang property, then it is a building canonically associated with a Lie group. If Δ satisfies all the other conditions and has rank ≥ 3, it must be topologically Moufang. Supported in part bynsf Grantmcs-82-04024 andmsri, Berkeley. Supported in part bynsf Grantdms-84-01760 andmsri, Berkeley.     

Clinical management of country and western singers

The particular problems faced by country and western singers have not often been studied. While making the words of the songs easily understood and creating a desired mood, country and western singers often strain their larynx. Usually, they do not benefit from the guidance of a vocal coach or have the social or economic background to seek early help or to know how to approach and enter the medical care delivery system. Even when they seek help, many speech pathologists, vocal coaches, and physicians are unfamiliar with their specific problems. Therapy for country and western singers depends on an accurate diagnosis and a clear understanding of their unique problems.     

On the rigidity of magnetic systems with the same magnetic geodesics

We study the analogue for magnetic flows of the classical question of when two different metrics on the same manifold share geodesics, which are the same up to reparametrization.

     

Spectrophotometric determination of rhenium as perrhenate after extraction of its brilliant green ion-pair with microcrystalline benzophenone

Rhenium (0–40 μg) is determined as pherrhenate spectrophotometrically at 640 nm after its adsorptive extraction at pH 6.0 with Brilliant Green onto microcrystalline benzophenone and dissolution of the solid phase in benzene. The effects of pH and diverse ions are reported. The system is applied to the determination of rhenium on alumina and on carbon catalysts.     

Studies in qualitative inorganic analysis. Part XLII

Summary Tests are given for the qualitative detection and confirmation of orthophosphate, pyrophosphate, phosphite, hypophosphite, hypophosphate, trimetaphosphate, tetrametaphosphate, tripolyphosphate, and high molecular weight phosphates.

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Zusammenfassung Reaktionen für den qualitativen Nachweis und die Unterscheidung folgender Anionen wurden angegeben: Ortho- und Pyrophosphat, Phosphit, Hypophosphit, Hypophosphat, Trimetaphosphat, Tetrametaphosphat, Tripolyphosphat und hochmolekulare Phosphate.

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Part XLI: Mikrochim. Acta [Wien]1970, 1287.