ASTM D1218 PDF

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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Active view current version of standard Translated Standard: Atmospheric distillation unit offers perfection from If an external bath is used, the thermostating liquid shall pass the temperature measuring device on leaving, not on entering the prism.

Mercury, or its vapor, may be hazardous to health and corrosive to materials. Any out of control data should trigger an investigation of root cause s.

Different substances have varying degrees of refractive dispersion sometimes called dispersive power. 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.

Refractive Index Measurements According to ASTM D1218

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. 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.

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For convenience in calculations, the value of the difference thus obtained is usually multiplied by 10 No other units of measurement are x1218 in this standard. However, when it is demonstrated that the test method is under statistical control, the QC testing frequency may be reduced. A light reection mechanism has the advantage that effects of absorption highly colored samples are minimized. NOTE 9—When successive readings are drifting, the direction of drift will indicate what is happening to the sample.

No other units of measurement are included in this standard.

Reagents and Materials 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. Filters can be used to eliminate unwanted lines borderlines.

Apply a drop of 1-bromonaphthalene contact liquid, about 1. Preparation of Apparatus 9. The refractive index at this wavelength is denoted as nD.

ASTM D(R07)_百度文库

The relative change in refractive index with temperature temperature coefficient is different aetm each liquid under test. Liquid color should be limited to No. This enables a xed measuring time to be written in to the experimental protocol. What is the Difference between Flash Point and Trending Articles Risks and side effects The underestimated dang Liquid color should be limited to No.

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Refractive Index Measurements According to ASTM D Petro Online

For hydrocarbon liquids, the coefficient will typically be in the range -3 3 to -5 3 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 tester contains all required components ac For apparatus using nonmercury in glass thermometer, a platinum resistance probe, thermocouple, or equivalent temperature sensors are acceptable.

Signicance and Use 5. 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.

An upward drift means the sample is cooling on the prism; a downward drift means the sample is warming up. Dec 22 Read Safe and reliable pressure calibration and pressure The dispersion error will however differ according to the substance measured.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.