THE CLASSIC ESTIMATION OF UREA IN THE BLOOD, while not technically difficult, is time consuming, and a quicker method was sought for an emergency procedure. It has been known for many years that a solution of xanthydrol with urea forms an insoluble precipitate, dixanthylurea. Also that this precipitate dissolves in 50% sulfuric acid to give an intense yellow-colored solution which obeys Beer’s ...

Eight new Schiff bases of 5-nitro and 5-bromo-substituted 1,10-phenanthroline-2,9-dicarboxaldehydes with sulfur-containing amines, thiosemicarbazide, S-alkyl/aryl dithiocarbazates and 2-mercaptoaniline have been synthesized and characterized by a variety of spectroscopic methods. The condensation reactions of the dialdehydes with the amines were carried out both in the presence and absence of c...

Because of the acute toxicity of Cr(VI)-bearing substances, the pollution problem caused by chromite process residue has become a worldwide concern. In the view of relevant studies, the technologies based on the alkali treatment cannot fundamentally resolve the pollution problem, because the oxidation of Cr(III) to Cr(VI) is unavoidable during chromite decomposition. In contrast, the oxidation ...

in this work, a tracer study on pore initiation in anodic alumina in oxalic acid was performed. effects of some experimental parameters such as applied electrical potential, electrolyte composition and heat pretreatment were evaluated. electrochemical and morphological experiments were performed using potentiostatic anodizing and scanning electron microscopy (sem) techniques, respectively. effe...

The reaction probabilities of NzO~ and C10N02 with HZO on liquid sulfuric acid surfaces have been reexamined to survey the effect of HNO~ on these two hydrolysis rates, using a fast flow reactor coupled to a chemical ionimtion mass spectrometer. The. measurements were cankd out by maintaining constant H20 and HNO~ partial pressures and by varying temperatures between 227 and 195 K in order to m...

nowadays, in many rangelands, due to over grazing, and problems that some plantshave in germination, the rate of forage production is greatly reduced. so to take advantages ofthe benefits of such plants, it is necessary to identify and remove barriers of germination andestablishment of suitable plants. the present study was designed to investigate differenttreatments of breaking dormancy and st...

The release of sulfur dioxide (SO2) into the atmosphere as a result of man’s domestic and industrial activities is a great environmental concern. A significant source of SO2 release into the atmosphere is industrial manufacture of sulfuric acid. A synthetic procedure that is linked with the medieval alchemist named Geber is introduced as a method to be considered for “greener” synthesis of sulf...

Abstract The study was conducted to extract zinc and the results on extraction of Zn from sublime with solution sulfuric, thermal phosphoric acids are presented depending Solid: Liquid (S:L), concentration duration leaching process. Sulfuric acid used a content 8% which is waste product non-ferrous metallurgy, phosphorites Central Kyzylkum. It has been established that maximum degree noted when...