Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Volumetric apparatus

Titrier-analyse, /. analysis by titration, volu metric analysis, -apparat, m. titrating apparatus, volumetric apparatus, titrierbar, a. titratable. [Pg.447]

The capacity of a glass vessel varies with the temperature, and it is therefore necessary to define the temperature at which its capacity is intended to be correct in the UK a temperature of 20 °C has been adopted. A subsidiary standard temperature of 27 °C is accepted by the British Standards Institution, for use in tropical climates where the ambient temperature is consistently above 20 °C. The US Bureau of Standards, Washington, in compliance with the view held by some chemists that 25 °C more nearly approximates to the average laboratory temperature in the United States, will calibrate glass volumetric apparatus marked either 20 °C or 25 °C. [Pg.80]

Volumetric analysis see Titrimetric analysis Volumetric apparatus see Graduated glassware Volumetry 7 Vycor apparatus 92... [Pg.877]

Determination of the accuracy of graduation marks on volumetric apparatus by weighing measured volumes of water, or determinations of the accuracy of weights by comparison with weights whose value is known with a high degree of accuracy. [Pg.618]

A heat-flow calorimeter of Tian-Calvet type from Setaram maintained at a desired temperature, from room temperature up to 400°C, was used in connection with a volumetric apparatus equipped with a Me Leod gauge. Sample weights were typically 100 mg and ammonia doses 0.1 cm NTP. [Pg.253]

In the broader sense, volumetric apparatus may be divided into two categories, namely ... [Pg.44]

Volumetric Apparatus Meant to Deliver a Definite Volume of Liquid... [Pg.44]

The two specific volumetric apparatus meant to deliver a defnite volume of liquid are burettes and pipettes which will be discussed very briefly below ... [Pg.44]

Various official compendia specifies a standard temperature (°C) for glass volumetric apparatus as mentioned hereunder ... [Pg.45]

The pipette is the second volumetric apparatus that is meant to deliver a definite volume of liquid. Pipettes are of two types, namely ... [Pg.46]

The two particular volumetric apparatus meant to contain a definite volume of liquid are volumetric flasks (also known as measuring or graduated flasks) and measuring cylinders (also known as graduated cylinders) which will be discussed here briefly ... [Pg.49]

The cubic centimetre is the volume occupied by a cube of which each side is 1 cm in length, and thus, 1 litre equals 1000.028 c.c. Therefore, it follows from here that the millilitre and cubic centimetre are not the same, though the difference is quite negligible. Hence, all volumetric apparatus is universally standardized in millilitres. [Pg.49]

Volumetric apparatus invariably used in titrimetric assays, meant either to deliver a definite volume of liquid viz., burettes and pipettes, or to contain a definite volume of liquid viz., volumetric flasks and measuring cylinders, have essentially the following three cardinal general considerations, namely ... [Pg.51]

New as well as used volumetric apparatus, namely burettes, pipettes, volumetric flasks and measuring cylinders etc., employed in carrying out most of the pharmacopoeial assays should be extremely clean. It is particularly of great importance where small volumes of liquids are measured. [Pg.51]

A positive evidence for a dirty apparatus may be sought by observing the adherence of droplets to the walls of a burette or pipette. However, in a clean volumetric apparatus, the liquid drains down quite uniformly thereby wetting the walls so that no droplets are visible to the naked eye. [Pg.51]

Part—I has three chapters that exclusively deal with General Aspects of pharmaceutical analysis. Chapter 1 focuses on the pharmaceutical chemicals and their respective purity and management. Critical information with regard to description of the finished product, sampling procedures, bioavailability, identification tests, physical constants and miscellaneous characteristics, such as ash values, loss on drying, clarity and color of solution, specific tests, limit tests of metallic and non-metallic impurities, limits of moisture content, volatile and non-volatile matter and lastly residue on ignition have also been dealt with. Each section provides adequate procedural details supported by ample typical examples from the Official Compendia. Chapter 2 embraces the theory and technique of quantitative analysis with specific emphasis on volumetric analysis, volumetric apparatus, their specifications, standardization and utility. It also includes biomedical analytical chemistry, colorimetric assays, theory and assay of biochemicals, such as urea, bilirubin, cholesterol and enzymatic assays, such as alkaline phosphatase, lactate dehydrogenase, salient features of radioimmunoassay and automated methods of chemical analysis. Chapter 3 provides special emphasis on errors in pharmaceutical analysis and their statistical validation. The first aspect is related to errors in pharmaceutical analysis and embodies classification of errors, accuracy, precision and makes... [Pg.539]

The adsorption isotherms of xenon were measured at 34°C using a classical volumetric apparatus. The 29xe-NMR measurements were performed at the same temperature on a Bruker CXP-200 spectrometer operating at 55.3 MHz. The n-hexane adsorptions were conducted at 90°C on a Stanton Redcroft STA-780 thermoanalyzer. The samples were submitted to a preliminary calcination under dry air up to 650°C with a heating rate of 10°C/min. [Pg.13]

For maximum accuracy, the manifold and calibrated volumes in a volumetric apparatus should be maintained at constant temperature. Thermostating is not necessary for vacuum micro balances but in helical spring balances the spring should be maintained at constant temperature. Continuous flow apparatus need not be thermostated since the signals are immediately calibrated with known volumes at the same temperature and pressure. However, ambient temperature and pressure must be known to insure accurate calibration. [Pg.195]

The gravimetric and volumetric apparatus both require vacuum systems. The continuous flow method does not. [Pg.195]

Because the gravimetric and volumetric apparatus use vacuum systems it is convenient to outgas by vacuum. Outgassing in a continuous flow apparatus is accomplished by purging. [Pg.195]

Gravimetric systems are limited to the maximum loading of the balance, usually about 1 g. Volumetric apparatus should use samples sufficiently large to reduce the void-volume error to an acceptable percentage. Usually a sample with about 10 m of surface area is used with nitrogen. Flow systems can accommodate a wide range of sample size and are well suited to small quantities of sample. [Pg.196]

The dosing requirement of gravimetric and volumetric apparatus can lead to pressure overshoot which may produce data off the isotherm in the hysteresis region. The continuous flow method is not susceptible to this phenomenon. [Pg.196]

Gravimetric instruments can accommodate any adsorbate. Continuous flow instruments are limited to adsorbates which will not condense at room temperature. Volumetric apparatus require various internal volume and manometer alterations when adsorbates with low vapor pressures are used. [Pg.196]


See other pages where Volumetric apparatus is mentioned: [Pg.480]    [Pg.3]    [Pg.87]    [Pg.87]    [Pg.87]    [Pg.187]    [Pg.41]    [Pg.44]    [Pg.50]    [Pg.51]    [Pg.51]    [Pg.51]    [Pg.543]    [Pg.70]    [Pg.79]    [Pg.216]    [Pg.225]    [Pg.194]    [Pg.197]    [Pg.3]    [Pg.4]    [Pg.624]    [Pg.186]   
See also in sourсe #XX -- [ Pg.44 ]

See also in sourсe #XX -- [ Pg.832 ]

See also in sourсe #XX -- [ Pg.4 ]




SEARCH



© 2024 chempedia.info