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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NOTE 7—When determining refractive dispersion, it is expected that the instrument would have been calibrated at both wavelengths used. Ensure that the instrument has a solvent resistant prism seal. Current edition approved Nov. Experience will demonstrate that this may be typically up to an hour.
Preparation of Apparatus Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Read comments r1218 Do you like or dislike what xstm have read? 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.
An ample supply of QC sample material should be available for the intended period of use, and should be homogeneous and stable under the anticipated storage conditions. If absolute refractive index that is, referred to vacuum is desired, this value should be multiplied by the factor 1.
Refractive Index Measurements According to ASTM D Petro Online
Discover the gold at the bottom of the barrel. Make your daily measuring routine a piece of cake: For convenience in calculations, the value of the difference thus obtained is usually multiplied by 10 Density and refractive index are then determined at the same time from the same sample which saves d118 and provides reliable results when analysing aviation fuels or similar finished products.
There is a variety of refractometers that have been found to be suitable for this measurement. Dec 27 Read Different substances have varying degrees of refractive dispersion sometimes called dispersive power.
The instrument principle is based on the critical angle concept. Verication of the accuracy of such measurements will depend upon the availability of reliable, certied reference standards that demonstrate the performance of the instrument used under the particular measuring conditions.
Refractive Index Measurements According to ASTM D1218
Reagents and Materials 7. It may also be dened as the sine of the angle of incidence divided by the sine of d12118 angle of refraction, as light passes from air into the substance.
This will entail regular checks on measurement accuracy verication using reliable standards. Verification of the accuracy of such measurements will depend upon the availability of reliable, certified reference standards that demonstrate the performance of the instrument used under the particular measuring conditions.
An upward drift means the sample is cooling on the prism; a downward drift means the sample is warming up. The results of such investigation may, but not necessarily, result in instrument recalibration.
Stability Uniformity Display Resolution 6 0. Liquid color should be limited d2118 No. Link to Active This link will always route to the current Active version of the standard.
D — 02 X2. Preparation of Apparatus 9. Originally approved in High accuracy Abbe refractometers require a pure spectral light source such satm a sodium arc lamp see 6.
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. 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. Ast, for practical purposes, because of the proximity of the lines, it is regarded as a single wavelength source and the average value of The temperature control unit external or internal shall aztm the following control specication: Caution should be taken when handling mercury and mercury containing products.
A light reection mechanism has the advantage that effects of absorption highly colored samples are minimized.
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. Link to Active This link will always route to the current Active version of the standard. Is Fracking the Way Forward?