The microchemical electrolytic analysis of alloys in hydrochloric acid solutions : Brasses and bronzes

The microchemical electrolytic analysis of alloys employing the methods of Sand and Lindsey for potential control have been extended to include complete analyses of brasses and bronzes in chloride solutions. The methods, employing from 5 to 20 milligrams of material, may be completed in about 2 hours (excluding the time necessary to bring the sample into solution) and are especially useful in circumstances where only a few milligrams of sample are available.     

The electrolytic separation from thorium nitrate of thorium c (212Bi) and thorium b (212Pb) in chloride solution

An electrodeposition process is described for separating thorium C and thorium B from radio-chemically “old” samples of thorium nitrate in hot 0.5N hydrochloric acid solution. The thorium C is first deposited on either platinum or nickel cathodes of special design using a controlled potential at the cathode, followed by the deposition of thorium B. Weights of the order of 10^-15 g ThC are involved.     

An electromagnetic vibrator for electrodes used in polarography and amperometric titrations

Details of the construction of au electromagnetic vibrator for micro-clcctrodes are given, The design embodies a centring guide which constrains the vibration in one direction only. The instrument is suitable for polarography and amperometric titrations.     

The spectrophotometric determination of polycyclic aromatic hydrocarbons. II

In repetitive determinations of polycyclic aromatic hydrocarbons in combustion products the use of incompletely separated Chromatographic fractions is often an advantage favouring rapid work. Such fractions may be submitted to an approximate quantitative analysis by using tables of absorption peak heights measured from a base-line drawn between theminima on each side of the peak. Convenient tables for this method are provided in this paper.     

The microchemical electrolytic analysis of alloys in hydrochloric acid solutions : White metals and solders

The microchemical electiolytic analysis of alloys employing the methods of SAND and LINDSEY for potential control have been extended to include white metals and solders. The methods, employing from 5 to 20 milligrams of material, may be completed in about 2 hours (excluding the time necessary to bring the sample into solution) and are especially useful in circumstances where only a few milligrams of sample are available.     

The spectrophotometric determination of polycyclic aromatic hydrocarbons

The determination of polycyclic aromatic hydrocarbons by elution chromatography from alumina columns followed by ultra-violet spectrophotometry has been elaborated for a more extended range of substances than has been published previously. The methods have been standardised and tables of absorption peaks are provided for easy identification of a number of compounds commonly found as traces in combustion products. Recommendations are given for the preparation of samples for determinations by this method, which has been successfully employed for the analysis of carbon blacks, soots, urban air solids, condensible smokes such as tobacco smoke, wood smoke and coal tar. thermal decomposition or pyrolysis products and other substances, such as urban vegetation, soil, tobacco, snuff, smoked food, and surface drainage water, which have been subjected to the action of smokes or other combustion products.