William Lewis (17081781), was a physician, author, and an experimental chemist. Sometime after 1730 he gave public lectures in London on chemistry and the improvement of pharmacy and manufacturing arts (1). With a growing reputation as a chemical experimentalist he was elected F.R.S., on October 31,1745, and was then living in Dover Street, London. In 1747 he moved to Kingston-uponThames, where...

The application of a linear algebraic method to the potentiometric titration of a mixture of tartaric and citric acids and sodium carbonate and sodium hydrogen carbonate (previously treated with strong acid), permits the determination of the concentration of each individual acid and the total equivalent of carbonate in antacids. It is also possible to determine individual concentrations of sodi...

Cocaine (COC)- and cocaethylene (CE)-creatinine clearance ratios (CCR) were determined in five patients. In each case, COC:CCR greatly exceeded CE:CCR, and in four patients the data suggested renal tubular secretion of COC. For all patients, some renal tubular reabsorption of CE was apparent. These findings may be due, at least in part, to the greater hydrophobicity of CE relative to COC and to...

We evaluated three commercially available methods for determining lipase (EC 3.1.1.3) in serum--the Du Pont aca, Boehringer Mannheim Diagnostics (BMD), and Kodak Ektachem (EK) procedures--for their analytical properties and diagnostic efficiencies. Titrimetry was used as the comparative method. The BMD and EK methods showed better agreement with the titrimetric method, owing to the presence of ...

The principle of flow ratiometry for high-throughput titration, which we recently proposed for potentiometric titration, was extended to photometric titration. The flow rate (FB) of a base solution containing an acid-base indicator was linearly varied in response to a control voltage (Vc) generated from a computer. With the total (acid + base) flow rate (FT) being kept constant, the base soluti...

Nonylphenol ethoxylate (NPE-10) is a non-ionic surfactant that synthesized from alkylphenol ethoxylate. The accumulation of NPE-10 in wastewater will endanger the ecosystem as well human being. Nowadays, can be degraded indirectly by using an electrochemical treatment advancement technology. Thus, this study aimed to evaluate electro-degradation potential MEO Ce(IV) ionic mediator. In addition,...

The objectives of this research were to assess the bioavailability of calcium using equilibrium dialysis after simulated gastric digestion method in 20 commonly consumed green leafy vegetables (GLVs) from the typical Indian diet, provide data on the content of calcium absorption inhibitors, like oxalate, phytate, tannin and dietary fibres, and evaluate the inhibitory effect of these compounds o...

EVER SINCE THE CLASSIC OXALATE METHOD of Kramer and Tisdall (1), for the determination of serum calcium, simpler methods have been sought to determine calcium. Among the more important methods suggested have been flame photometry, colorimetry, and titrimetry. Flame photometry of calcium in serum and urine has not as yet been satisfactorily developed. Serious and rather unpredictable interferenc...

The acid-base indicator properties of aqueous and ethanol extracts from calyces of H. sabdariffa (Zobo) and a dye obtained from the ripe fruits of Basella alba (Indian spinach), two local plants, were investigated. A purple coloured dye obtained from the ripe fruits of Basella alba showed a λmax at 580nm, absorptivity of 0.2269 and was found to be photochemically unstable. A deep red coloured d...

The application of chelate reactions in a general way began a few years before the turn of the century, but the term 'chelate' was coined considerably later by Morgan and his colleagues at the University of Birmingham, who made the first systematic studies. Work in this field has continued at Birmingham for over half a century, apart from a break during the war years. During the last twenty-fiv...