The observation, that absorption of light by concentrated sulphuric acid at wavelengths near 193 nm apparently tends to zero as the acid is progressively purified, is supported by ab initio calculations of the energies of the three lowest excited states of monomeric H2SO4. The electronic-structure calculations indicate that the lowest excited state is not accessible by single-photon absorption ...

T he present work presents the extraction of copper(II) from sulphuric acid solutions with Sodium diethyldithiocarbamate (SDDT), and six different organic diluents: Dichloromethane, Chloroform, Carbon tetrachloride, Toluene, xylene and Cyclohexane, were tested. The pair SDDT/Chloroform showed to be the most selective in removing the copper cations, and hence was considered throughout the experi...

Dihydrodihydroxy compounds are important intermediates in the metabolic pathways of aromatic hydrocarbons, giving rise to many of the metabolites observed in the urine when the parent hydrocarbons are given to animals. Thus, for example, when tran8-1,2-dihydro-1,2-dihydroxynaphthalene is given to rats it is excreted partly unchanged in conjugation with glucuronic acid, partly as 1-naphthol in c...

THE work to be described was undertaken with the intention of investigating the optically active substances of blood other than glucose. It was stated by Winter and Smith [1922] that the optical rotation of a concentrated protein-free filtrate of mammalian blood was initially less than that calculated from the amount of glucose estimated to be present. This difference they attributed to the pre...

With the increasing clinical use of chlorpromazine (" largactil ") it was found desirable to obtain a satisfactory method for its determination in biological fluids. Procedures have been described for this substance or for closely related phenothiazine compounds using plant peroxidases (Solsona and Mora, 1951), ferric chloride (Fossoul, 1950), sodium persulphate (Fossoul, 1951), picric acid (Uy...