Article révisé par les pairs
| Résumé : | The progress made in quantitative chromatography on paper has been in stages with the objective of making it into a micro- and ultramicro technique of real practical value; that is to say, to render it accomplishable in a very short time, applicable to very slight amounts of material, and with the maximum of reproducibility. Direct spectrophotometry on the paper of the colored stains, utilizing the transmission of the light through the latter, meets these criteria. This procedure makes it possible to determine the concentration of an element contained in a stain within several minutes and with a reproducibility surpassing anything obtained previously, and even with amounts of the order of 0,02 to 0,03 μg. Later papers will deal with the improvements and simplifications studied with respect to cobalt, copper, zinc, cadmium, barium, and lead. © 1957 Springer-Verlag. |
