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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Vapors may cause ash re. Safe and reliable pressure calibration and pressure This will entail regular checks on measurement accuracy verication using reliable standards. Record or report, or both, this value as the refractive index of the sample at the test temperature.

Refractive index should, therefore, be measured using light of a single wavelength monochromatic light. Trending Articles Risks and side effects The underestimated dang This enables a xed measuring time to be written in to the experimental protocol. New, robust and user-friendly general purpose monitor Dec 17 Read Preparation of Apparatus 9. Any out of control data should trigger an investigation of root cause s.

Refractive Index Measurements According to ASTM D1218

The relative change in refractive index with temperature temperature coefficient is different for each liquid under test.

Press the reference standard against the surface of the prism face with the polished end towards the light source. Dec 18 Read Hydrocarbon liquids have a higher temperature coefficient than water and astj solutions.

A light reection mechanism has the advantage that effects of absorption highly colored samples are minimized. Signicance and Use 5. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Their vapor can be harmful. Invariably, liquid reference standards will be preferred and will be recommended by instrument manufacturers for this reason.

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The protocol should also include procedures that govern the control of calibration materials: In circumstances where the instrument is used continuously and in a constant thermal condition, the need for recalibration should be minimal. The degree of impurity band width will cause a dispersion of the detected light from the sample. When an electronic instrument is rst switched on and r1218 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.

What is the Difference between Flash Point and Note 1 asttm The test method may be suitable for measuring the refractive indices of liquids above 1. No other units of measurement atsm included in this standard. This standard has been approved for use by agencies of the Department of Defense. astk

Ensure the prism temperature is correct and the instrument has been properly calibrated. If an external bath is used, the thermostating liquid shall pass the temperature adtm device on leaving, not on entering the prism.

Read comments 0 Do you like or dislike what you have read? Discover the gold at the bottom of the barrel. Reasonable precautions v1218 be taken to minimize these atm.

Characterisation of Hydrocarbons in Shale R The tester contains all required components ac 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 22 Read Dec 14 Read Anton Paar has launched Dianathe ideal solution for automatically performing high-precision distillation range analysis at atmospheric pressure.

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No other units of measurement are included in this standard. This effect leads to calibration drift, which must be periodically corrected to ensure measurement reliability. Dust and oil can impair the optical component of the instrument. A disadvantage of reectance is the difficulty of observing the borderline in optical-mechanical Abbe instruments because of the low light intensity and poor contrast.

Spectro Scientific acquired by Ametek Dec 14 Read Verication of the accuracy of such measurements will depend upon the availability atm reliable, certied reference standards that demonstrate the performance of the instrument used under the particular measuring conditions. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Solid atm 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.

Allow 3 min temperature equilibration time.

ASTM D(R07)_百度文库

Link to Active This link will always route to the current Active version of the standard. Dec 17 Read Liquid color should be limited to No. Asttm on the light source. Is Fracking the Way Forward?

Leaving comments on product information and articles can assist with future editorial and article content. This is particularly noticeable when samples are much hotter or cooler than the prism. The QC testing frequency should be increased if a large number of samples are routinely analyzed.