D – 99 Standard Test Method for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids, hydrocarbons, refractive dispersion, refractive index. ASTM D(R07) – Designation: D – 02 (Reapproved ) An American National Standard. As well as adding a sample changer or special density cell for high pressures and temperatures, a DMA Generation M density meter from Anton Paar (Austria) .
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For hydrocarbon liquids, the coefficient will typically be in the range -3 3 to -5 3 NOTE 6—The constancy of the prism temperature can be seriously affected by variations in ambient conditions such as air drafts or changes in room temperature.
The degree of impurity band width will cause a dispersion of the detected light from the sample. This will entail regular checks asttm measurement accuracy verication using reliable standards. NOTE 8—From experience using the instrument, the user will be able to judge with a safe margin the amount of time needed for a sample to thermally equilibrate on the prism.
Turn on the light source. Different substances have varying degrees of refractive dispersion sometimes called dispersive power. The aztm contains all required components ac Instrument software can be used to compensate for and thus minimize this error source but it will nevertheless be a factor in determining the limiting accuracy of the instrument. Safe and reliable pressure calibration and pressure Liquid color should be limited to No. Jul 17 Read The instrument principle is based on the critical angle concept.
Based on this, it may be possible on some models to set an automatic delay time for readings.
Refractive Index Measurements According to ASTM D1218
Mercury, or its vapor, may be hazardous to health and corrosive to materials. Open the ashm assembly. Caution should be taken when handling mercury and mercury containing products. Ensure the prism temperature is correct and the instrument has been properly calibrated.
Refractive index should, therefore, be measured using light of a single f1218 monochromatic light. Historical Version s – view previous versions of standard Translated Version s: Press the reference standard against the surface of the prism face with the polished end towards the light source.
The calibration should only be reset when measured values are outside of the stated tolerance. NOTE 7—When determining refractive dispersion, it is expected that the instrument would have been calibrated at both wavelengths used. Test plates are particularly difficult to apply to sapphire prisms of the type typically used in digital electronic refractometers.
Any calibration uid could be used. D — 02 Reapproved An American National Standard Standard Test Method for Refractive Index and Refractive Dispersion of Hydrocarbon Liquids1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. However, it is best practice to select uids with a refractive index close to the intended measuring range or, where a pair or group of standards is needed, select liquids that adequately span the working range.
Historical Version s – view previous versions of standard. Originally published as Lawrey, D.
Refractive Index Measurements According to ASTM D Petro Online
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
The protocol should also include procedures that govern the control of calibration materials: It may also be dened as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance. Some instruments offer a wider measuring range but it is important to verify the uniformity of accuracy across the entire measuring range and to ensure suitable calibration materials are available for this verication.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Dec 18 Read However, this instrument is no longer manufactured. This is because the micro-roughness of sapphire is greater than that of d12118 optically atter glasses used in optical Abbe refractometers. Individual reprints single aatm multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
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And What is it Used For? This enables a xed measuring time to be written in to the experimental astmm. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Preparation of Apparatus 9. Sep 19 Read Liquid color should be limited to No. New, robust and user-friendly general purpose monitor Dec 17 Read