A rapid and accurate atomic absorption method for the determination of chromium in faeces samples from pasture experiments using chromic oxide ‘markers’ is described. Of the elements present after ashing and digesting the samples in a phosphoric acid—manganese sulphate—potassium bromate solution silicate, aluminium, calcium and magnesium were found to interfere in the determination. The effects of these interferences were overcome by the addition of calcium to the test solution and by the addition of silicate to the standards, which were prepared in ‘blank’ solutions.The sensitivities of a number of alternate chromium resonance lines relative to that of Cr 3578·7 A. are given. These lines may be used to increase the concentration range of the analysis.The results of a comparison of the atomic absorption method with a chemical method are given.

https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002185960001546X

The determination of chromic oxide in faeces samples by atomic absorption spectrophotometry

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The determination of metals in blood serum by atomic absorption spectroscopy—I. Calcium

Determination of Calcium and Magnesium in Urine by Atomic Absorption Spectroscopy

The determination of calcium in biologic fluids by atomic absorption spectrophotometry is interfered with by the presence of protein, cations, and those anions that form complexes with calcium. Such interference was overcome when lanthanum was included in a 1:50 dilution of serum or urine. Recovery of calcium added to calcium-free serum was 100%. The S.D. based on double-blind duplicates was 0.22 mg./lOO ml. Excellent statistical agreement was found between the test method and each of the 2 reference methods.

A. Walsh

Papers

An atomic-absorption spectrophotometer and its application to the analysis of solutions

Analysis of metallic samples by atomic absorption spectroscopy

Resonance radiation from a hollow-cathode

A simple atomic absorption spectrophotometer

Hollow-cathode discharges-the construction and characteristics of sealed-off tubes for use as spectroscopic light sources