Non-destructive determination of hydrogen in organic solvents by neutron slow-down process

Non-destructive Testing: Neutron Radiography

multiwavelength pectrophotometric determination of stability constants of 4-(2– thiazolylazo) resorcinol (tar) with la3+, y3+ and th4+ in organic-water mixed solvents by chemometrics method & simultaneous spectrophotometric determination of lead, copper and nickel using xylenol orange by partial least squares calibration method

تشکیل کمپلکس های tarبا یون های لانتانیم, ایتریم و توریم در دمای 25 درجه، قدرت یونی ثابت 0.1 مولار و در ph ثابت در مخلوط حلال های اتانول – آب و استونیتریل – آب با استفاده از روش های اسپکتروفوتومتری مورد بحث و بررسی قرار گرفت. داده های اسپکتروفوتومتری با استفاده از نرم افزار squad پردازش شدند تا ثابت های تشکیل کمپلکس اندیکاتور – فلز را محاسبه کند. نتایج نشان می دهد که درصد حلال آلی در مخلوط حلال ...

Determination of total organic acids in urine by extraction with organic solvents.

Metabolic carboxylic acids are extracted, with a mixture of equal volumes of t-amyl alcohol-chloroform, from an acidifiedsample of as littleas 200 tI of urine that has been adsorbed to a short column of silicagel. Total acid in the extract is measured by titrationwith tetramethylammonium hydroxide (10 mmol/liter) to a phenolphthalein end point.There is no interferencefrom protein,creatinine, cr...

Hydrogen bonding properties of non-polar solvents.

A combination of high-throughput NMR titration experiments, UV-Vis absorption titrations and data collected from the literature on 1:1 H-bonded complexes has been used to characterise the H-bond properties of non-polar organic solvents: alkanes, perfluorocarbons, aromatic and halogenated organic solvents. The results are analysed in the context of the electrostatic solvent competition model, wh...

Solubility determination of cholesterol polymorphs in organic solvents.

In a study of the solubility of crystalline forms of cholesterol in various solvents, the solubilities (per cent by weight) of cholesterol needles and hydrated plates at 38#{176} were, respectively, 4.0 and 3.2% in olive oil; 2.6 and 1.9% in tetradecane; 26.2 and 9% in toluene; and 21.0 and 7% in cyclohexane. When these solvents are in equilibrium with an aqueous phase, needles are converted to...