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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Automatic digital refractometers may require a single zerotwo-point, or multi-point calibration. Calculation and Report No other units of measurement are included in this standard. Refractive index should, therefore, be measured using light of a single zstm monochromatic light. A number in parentheses indicates the year of last reapproval. This combination of instruments is the first step to a modular measuring system called the Modulyser Unlimited Class.
In circumstances where the instrument is used continuously and in a constant thermal condition, the need for recalibration should be minimal. The QC testing frequency should be increased if a large number of samples are routinely analyzed.
Refractive Index Measurements According to ASTM D Petro Online
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. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
The protocol should also include procedures that govern the control of calibration materials: The relative change in refractive index with temperature temperature coefficient is different for each liquid under test.
When an electronic instrument is rst switched on and the liquid bath circulation is started, a period of thermal adjustment is required to allow the internal environment, and particularly the optical system, to adjust to the new condition.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not s1218 as part of the standard. Is Fracking the Way Forward? This is the relative index of refraction. Miniature spectrometer spearheads development of a n The numerical value of refractive index of liquids varies inversely with both wavelength and temperature.
D1281 plates are often preferred for their stability shelf lifebut have the disadvantage of limited accuracy in use because of the errors associated with the placing of the plate on the refractometer prism.
Refractive Index Measurements According to ASTM D1218
Density and refractive index are then determined at the same time from the same sample which saves time and provides reliable results when analysing aviation fuels or similar finished products. Dec 21 Read Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure. New FM approved liquid analyser system is safe for h For convenience in calculations, the value of the difference thus obtained is usually multiplied by 10 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.
Safe and reliable pressure calibration and pressure Last previous edition approved in as D — Signicance and Use 5. Experience will demonstrate that this may be typically up to an hour.
Mercury, or its asfm, may be hazardous to health and corrosive to materials. Water can be removed from hydrocarbons by treatment with calcium chloride followed by ltering or centrifuging to remove the desiccant. However, when it is demonstrated that the test method is under statistical control, the QC testing frequency may be reduced.
Dust and oil can impair the optical component of the instrument. Dec 17 Read The sample shall be free d121 suspended solids, water, or asm materials that may settle onto the prism surface and affect the measured reading. Record or report, or both, this value as the refractive index of the sample at the test temperature. However, pure materials may be used, if so desired.
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