Analytical Procedure for Measurement of Long-Lived Radioactive Sulfur, S³⁵, with Lauritzen Electroscope and Comparison of Electroscope with Special Geiger Counter

An Evaluation of Radiosulfate for the Determination of the Volume of Extracellular Fluid in Man and Dogs 1

“…The first involved the precipitation of sulfate as the benzidine salt from protein-free filtrates, and collection of the precipitate on filter paper by a suction apparatus (a modification of the procedure of Henriques and his coworkers [27] (29).…”

The measurement of radioactive sulphur (35S) in biological material

“…Several methods have been described in which the material containing 35S is oxidized and the sulphate is precipitated as the barium or benzidine salt, the radioactivity of which is measured. Among the oxidation procedures which have been used are the Pirie (1932) method (Tarver & Schmidt, 1939;Boursnell, Francis & Wormall, 1946), the Carius method (Henriques, Kistiakowsky, Margnetti & Schneider, 1946), oxidation with concentrated nitric acid and hydrogen peroxide (Seligman & Fine, 1943), and oxidation with sodium carbonate and sodium peroxide (Dziewiatkowski, 1945).…”

Occurrence of Bis(β-Amino-β-Carboxy-ethyl) Trisulphide in the Hydrolysates of Wool and other Proteins

“…and 2% (w/v) benzidine hydrochloride solution ( -0 ml.). The amounts of 'carrier' sulphate and cysteic acid added were calculated to give a final weight of 7 mg. of benzidine sulphate in the subsequent procedures (Henriques et al 1946). The benzidine ["5S]sulphate precipitates were collected on planchets for 35S assay, and the filtrates and washings, containing [35S]cysteic acid, were evaporated to dryness in heavy-walled tubes (1 cm.…”