Determination of Very Small Quantities of Lead

Autor:	R. R. Marshall, D. C. Hess
Rok vydání:	1960
Předmět:	Boric acid chemistry.chemical_compound chemistry Meteorite Radiochemistry Analytical chemistry Thermal ionization Graphite Dithizone Isotope dilution Mass spectrometry Iron meteorite Analytical Chemistry
Zdroj:	Analytical Chemistry. 32:960-966
ISSN:	1520-6882 0003-2700
DOI:	10.1021/ac60164a019
Popis:	A procedure was developed for separating microgram quantities of Pb from rocks, stone meteorites, and iron meteorites, with minimum contamination. Lead is volatilized from samples typically containing less than 1 ppm. The powdered sample or piece of iron meteorite is placed in a graphite crucible, heated to as high as 1400 deg C by an induction heater. After condensation on a water-cooled quartz surface, the lead is further purified rapidly and simply by dithizone extraction. Concentrations are determined colorimetrically using Pb/sup 212/ tracer to determine yields, as well as by isotopic dilution. Correction for contamination is made by blanks treated in the same way as the samples. Mass spectrometric analysis by surface ionization has been improved for small samples by using boric acid and tantalum filaments. Isotopic ratios can be measured to within a few per cent with approximately 1- gamma quantities. Where possible, the results are compared to those of other methods of analysis. (auth)
Databáze:	OpenAIRE
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