A scheme for the photometric determination of minute amounts of arsenic, copper, lead, zinc and iron (with certain other metals) in organic compounds, e.g., medicinals

Determination of lead in organic coloring dyes by atomic absorption spectroscopy

“…A 1% solution of DDDC was used to chelate the Pb. This ligand was chosen because it forms a chelate that can be extracted from highly acid solutions (pH < 0.1-6) as shown by Jordan (1968) and because both the diethylammonium salt and the sodium salt have been used previously by Bode and Tusche (1957), Bode and Neumann (1960), Chernikhov" and Dobkin (1949), Hessel (1968), Jordon (1968), Strafford et al (1945), and Tati et al (1966) in nonaqueous atomic absorptions.…”

Pharmaceuticals and Natural Drugs

“…A scheme of analysis is reported by Stafford et al (187) for the successive determination of minute amounts of copper, arsenic, lead, zinc, and iron in a 2-gram sample of organic material-i.e., medicináis. It has been devised principally for application to compounds with a very low metal specification; however, it is sufficiently flexible to be adapted to materials with a somewhat higher metal content.…”

Colorimetric determinations of traces of bismuth in rocks

“…Tompsett (1938) observed that bismuth reacted with diethyldithiocarbamate to form a complex extractable by ether from a weak acid solution. Strafford, Wyatt, and Kershaw (1945) and LaCoste, Earing, and Wiberley (1951) observed that chloroform also extracted the complex. Later Sedivec and Vasak (1950) and Cheng and Bray (1953) reported that bismuth was the only element causing interference when carbamate and ethylenediamine-tetraacetic acid were used to determine copper colorimetrically, and that cyanide destroyed copper carbamate but did not affect bismuth.…”