The direct absorptiometric determination of copper in steel and cast iron with 2,2′-biquinolyl

Ferrous Metallurgy

“…For the determination of small amounts of cobalt, neutron activation (121, 242, 327) and isotope dilution analyses (272) were recommended. COPPER _ Copper was determined by use of the biuret reaction (116), its color reaction with oxalyldihydrazine in the presence of acetaldehyde (51), or with 2,2'biquinolyl (295) without separation from iron. Biscyclohexanone oxalyldihydrazine was used for the color development after separation of iron (234) Copper was extracted from iron with 2,2'biquinolyl in amyl alcohol (106), with 1,2di -(0 -aminobenzylideneamino) ethane in benzene (224), with dithiocarbamate in carbon tetrachloride (266), and with 1,5-diphenylcarbohydrazide in benzene (309) as basis for its determination.…”

“…Work to improve the vacuum fusion method continues; equipment with which a more rapid analysis can be made (187, 340) and methods for better recovery of the gases were described (164,207,243,343). HYDROGEN Hot extraction of hydrogen in vacuum (281,294) and by means of an inert carrier gas (293) continue to be the principal methods for its removal from metals. In these methods, the metal is not heated to the molten state and hydrogen is liberated in a relatively pure elemental form.…”