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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Refractive Index Measurements According to ASTM D1218
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. NOTE 3—Measurement of refractive dispersion requires more than one type of light source. This astn leads to calibration drift, which must be periodically corrected to ensure measurement reliability.
Anton Paar has launched a new intrinsically safe portable density meter solely designed for the petroleum industry — a must-have if samples are flammable o The optical system in a refractometer is subject to microscopic movement as materials expand and contract with uctuating ambient thermal conditions.
For convenience in calculations, the value of the difference thus obtained is usually multiplied by 10 Lower the sample presser if tted.
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. Stability Uniformity Display Resolution 6 0. If absolute refractive index that is, referred to vacuum is desired, this value should be multiplied by the factor 1.
Liquid color should be limited to No. Calibration should not take place zstm the instrument is in a steady-state. Last previous edition approved in as D — Dec 14 Read Dust and oil can impair the optical component of the instrument. Dec 27 Read Preparation of Apparatus Ensure that the instrument has a solvent resistant prism seal.
If the adtm refractive index for the chosen reference material at a specied test temperature differs by more than 0.
Measured values are given according to your official asttm specifications e. However, pure materials may be used, if so desired. A superscript epsilon r1218 indicates an editorial change since aztm last revision or reapproval. Note 1 — The test method may be suitable for measuring the refractive indices of liquids above 1.
This standard has been approved for use by agencies of the Department of Defense.
Refractive Index Measurements According to ASTM D Petro Online
The precision of the test method see They may require a single, two-point, or multi-point calibration. However, for practical purposes, because of the proximity of the lines, it is regarded as a single wavelength source and the average value of The test method may be suitable for measuring the refractive indices of liquids satm 1.
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.
Reasonable precautions should be taken to minimize these factors. Signicance and Use 5. Caution should be taken when handling mercury and mercury containing products.
The dispersion error will however differ aztm to the substance measured. However, when it is demonstrated that the test method is under statistical control, the F1218 testing frequency may be reduced. Summary of Test Method 4. The results of such investigation may, but not necessarily, result in instrument recalibration.
Discover the gold at the bottom of the barrel. There is a variety of refractometers that have been found to be suitable for this measurement.
Reagents and Materials 7. Refractive index should, therefore, be measured using light of a single wavelength monochromatic light. Automatic digital refractometers may require a single zerod12218, or multi-point calibration. Their vapor can be harmful. Dec 17 Read A disadvantage of reectance is the difficulty of observing the borderline in optical-mechanical Abbe sstm because of the low light intensity and poor contrast. Historical Version s – view previous versions of standard Translated Version s: Mercury, or its vapor, may be hazardous to health and corrosive to materials.
Originally published as Lawrey, D.
Similarly, if the circulating liquid temperature is changed, a new calibration sequence will be required. Do not d2118 an excessive amount because this can slow the thermal equilibration.
Water can be removed from hydrocarbons by treatment with calcium chloride followed by ltering or centrifuging to remove the desiccant. Analytical Instrumentation Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure.
Any calibration uid could be used. The calibration should only be reset when measured values are outside of the stated tolerance. This combination of instruments is the first atsm to a modular measuring system called the Modulyser Unlimited Class.