It is very stable and is much used in volumetric analysis.
Among the volumetric methods used, the one most commonly employed is that of W.
Arsenic can also be estimated by volumetric methods; for this purpose it must be in the arsenious condition, and the method of estimation consists in converting it into the arsenic condition by means of a standard solution of iodine, in the presence of a cold saturated solution of sodium bicarbonate.
Chlorimetry (1824), alkalimetry (1828), and the volumetric determination of silver and chlorine (1832) were worked out by Gay Lussac; but although the advantages of the method were patent, it received recognition very slowly.
and of iodine and sulphurous acid to the estimation of copper and many other substances by Robert Wilhelm Bunsen, marks an epoch in the early history of volumetric analysis.
Quantitative methods are divided into four groups, which we now pass on to consider in the following sequence: (a) gravimetric, (0) volumetric, (7) electrolytic, (5) colorimetric.
Volumetric Analysis: F.
Sutton, Systematic Handbook of Volumetric Analysis (1904); F.
These methods have been purely chemical (either gravimetric or volumetric), physical (determinations of the density of nitrogen, nitric oxide, &c.) or physicochemical.
Volumetric methods are used, but the uncertainty of the end of the reaction has led to the suggestion of special indicators, or of determining the amount of cuprous oxide gravimetrically.
Volumetric methods have also been devised.
For all pharmaceutical purposes, however, the use of the metric system alone is employed in all paragraphs relating to analysis, whether gravimetric or volumetric. For measures of capacity the Pharmacopoeia continues to use imperial measuring vessels graduated at the legal temperature of 62° F.
The new Pharmacopoeia also follows foreign practice, and employs metric measures of capacity and volumetric vessels graduated at 15.5 C., or 60° F.
Iodine has extensive applications in volumetric analysis, being used more especially for the determination of copper.
In one of them, read in 1814, he explains the principles of volumetric analysis, in which he was one of the earliest workers.
The "dry" or fire assay for lead is largely used for the valuation of lead ores, although it is being gradually replaced by volumetric methods.
There are several volumetric methods for assaying lead ores, but the best known is that based on the precipitation of lead by ammonium molybdate in an acetic acid solution.
The most modern and the most generally accepted method is volumetric, and is based on the reaction between zinc chloride and potassium ferrocyanide, by which insoluble zinc ferrocyanide and soluble potassium chloride are formed; the presence of the slightest excess of potassium ferrocyanide is shown by a brownish tint being imparted by the solution to a drop of uranium nitrate.
The fire assay for copper ores was abandoned years ago and the electrolytic method took its place; this in turn is now largely replaced by volumetric methods.
Volumetric methods are more expeditious and require less apparatus.
The methods used in the assay for iron are volumetric, and are all based on the property possessed by certain reagents of oxidizing iron from the ferrous to the ferric state.
In general, volumetric methods are used, i.e.
There were no significant differences in cortical volumetric bone mineral density (vBMD) at the radius or tibia diaphysis between the groups.
volumetric flask Used to make up an accurate volume of a solution, for example, 250 cm 3.
free-form surface, polygonal model, point cloud data or volumetric data.
Use of volumetric glassware for solvents other than water should not rely on the water calibration.
volumetric pipettes and flasks for dilutions as required for ammonia analysis.
volumetric glassware for solvents other than water should not rely on the water calibration.
volumetric heat transfer coefficients the total volume curve for 2, 3 and 4-6 stream units.
volumetric efficiency of well over 100% can be achieved.
For all pharmaceutical purposes, however, the use of the metric system alone is employed in all paragraphs relating to analysis, whether gravimetric or volumetric. For measures of capacity the Pharmacopoeia continues to use imperial measuring vessels graduated at the legal temperature of 62Ã‚° F.
The new Pharmacopoeia also follows foreign practice, and employs metric measures of capacity and volumetric vessels graduated at 15.5 C., or 60Ã‚° F.
This includes two constant pressure thermogravimetric analysers, and a volumetric PCT system to measure the uptake and sorption kinetics of hydrogen storage materials.
From the resulting overall volumetric heat transfer coefficients the total volume curve for 2, 3 and 4-6 stream units.
The bulk modulus K ' relates the change in stress to the volumetric strain.
More airflow = More horsepower Volumetric efficiency of well over 100% can be achieved.
Separate mix lubrication is provided by a variable delivery volumetric pump.
This tax credit program is a volumetric based income tax credit for the production of biodiesel that is made from first-use vegetable oils and first-use animal fats.
In quantitative analysis the methods can be subdivided into: (a) gravimetric, in which the constituent is precipitated either as a definite insoluble compound by the addition of certain reagents, or electrolytically, by the passage of an electric current; (b) volumetric, in which the volume of a reagent of a known strength which produces a certain definite reaction is measured; (c) colorimetric, in which the solution has a particular tint, which can be compared with solutions of known strengths.
Volumetric analysis, possessing as it does many advantages over the gravimetric methods, has of late years been extensively developed.
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