ASTM E355 PDF
Buy ASTM E() Standard Practice for Gas Chromatography Terms and Relationships from SAI Global. ASTM E() Standard Practice for Gas Chromatography Terms and Relationships CONTAINED IN VOL, Describes terms and relationships. E() Standard Practice for Gas Chromatography Terms and This practice is under the jurisdiction of ASTM Committee E13 on Molecular.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. However, most of the terms should also apply to other kinds of gas chromatography and are also valid in the various liquid column chromatographic techniques, although at this time they are not standardized for the latter usage.
Names of Techniques 2. The stationary phase may be either a dry granular solid or a liquid supported by the granules or by the wall of the column, or both. Separation is achieved by differences in the distribution of the components of a sample between the mobile and stationary phases, causing them to move through the column at different rates and from it at different times.
In this recommended practice gas elution chromatography is implied. If the sample is introduced as a liquid, it is vaporized in the system prior to or during passage through the separation column.
Current edition approved April 10, Originally published as E — Last previous edition E In linear PTGC the program rate is constant during analysis. Isothermal intervals may be included in the temperature program. The reaction can take place upstream of the column when the chemical composition of the individual components passing through the column differs from that of the original sample, or between the column and the detector when the original sample components are separated in the column but their chemical composition is changed prior to entering the detection device.
Sample introduction can be carried out by introduction of a liquid, solid, or gas into the carrier-gas stream. The sample may be vaporized before or after introduction into the column. All of the sample vapor enters the column. The sample vaporizes as the column section containing the liquid heats up after injection. The ratio of the total inlet? The injection period is typically one minute. A PTV may operate in either a split, splitless, on-column, or direct mode.
The retention gap may have an inner diameter different than the analytical column. The retention gap has signi?
This porous solid layer can either act as an adsorbent or a support which in turn is coated with a thin? The solid layer can either be deposited on the inside tube wall or formed by chemical means from the wall. Inert materials that merely provide physical support for the stationary phase or occupy space within the column are not part of the stationary phase. It may consist of porous or impenetrable particles or granules which hold the liquid phase and between which the carrier gas?
It is usually expressed as weight percent of liquid phase present in the column packing: Gas Chromatographic Data 5.
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Idealized chromatograms obtained with differential and integral detectors for an unretained substance and one other component are shown in Fig. The Baseline is the portion of the chromatogram recording the detector response in the absence of solute or solvent emerging from the column. A Peak is the portion of the chromatogram recording the detector response while a single component is eluted from the column. If two or more sample components emerge together, they d355 as a single peak.
ASTM E355 – 96(2014)
Retention dimensions parallel to the baseline are termed as the peak widths. The retention dimension of a line parallel to the peak base bisecting the peak height and terminating at the in?
The retention dimension of the segment of the peak base KL intercepted by the tangents drawn to the in? As sample components pass through the detector the baseline is displaced cumulatively.
The change in baseline position astj a single sample component is eluted is a Step.
ASTM E – 96 Standard Practice for Gas Chromatography Terms and Relationships
The difference between straight line extensions of the baselines on both sides of ee355 step, measured in the direction of detector response, is the Step Height, NM. The interrelations shown apply only to gas elution chromatography columns operated under constant conditions and for which the partition coefficients are independent of concentration.
Presentation of Isothermal Retention Data 7. When the solid support is inert, its particle-size range and distribution, and within limits the amount and mode of deposition of the liquid phase, may be varied also.
While the solid support is commonly assumed to be inert, often this is not so. The physical disposition of the liquid phase may also affect retention values 1. Relative retentions are more conveniently determined, however, and they should be expressed relative to a substance which is easily available and emerges relatively close to the substance of interest.
EN 10297-1 E235/E275/E355 /ASTM A106/A53 Gr.B E235 pipe
An example of a reference pressure is An example of a reference temperature is VD] where P is the relative pressure and j asgm pressure gradient correction factor as de? T S c retention dimension between the in? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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