ASTM D4307-17 (R2021) pdf free download.Standard Practice for Preparation of Liquid Blends for Use as Analytical Standards.
1.1 This practice covers a laboratory procedure for the preparation of small volumes of multicomponent liquid blends for use as analytical standards.
1.2 This practice is applicable to components that are normally liquids at ambient temperature and pressure. or solids that will form a solution when blended with liquids. Butanes can be included if precaution is used in blending them.
1.3 This practice is limited to those components that fulfill the following conditions:
1.3.1 They arc completely soluble in the final blend.
1.3.2 They are not reactive with other blend components or with blend containers.
1.3.3 The combined vapor pressure of the blended components is such that there is no selective evaporation of any of the components.
1 .3.3.1 The butane content of the blend is not to exceed 10 %. (Warning—Extremely flammable liquefied gas under pressure. Vapor reduces oxygen available for breathing.) Components with a vapor pressure higher than hutanes are not to he blended.
1 .4 The values stated in SI units are to he regarded as the standard.
3. Summary of Practice
3.1 The individual blend components are precisely weighed and combined in an inert, tight-sealing glass vial or similar container. When volatility is a consideration, the components of lowest vapor pressure (least volatile) are added first and the highest (most volatile) last. Mass (weight) percent composition of the final blend is calculated from the mass and purities of the pure components. Volume percent composition can he calculated using the density of each component.
4. Significance and Use
4.1 The laboratory preparation of liquid blends of known composition is required to provide analytical standards for the calibration of chromatographic and other types of analytical instrumentation.
5. Apparatus
5. 1 Containers:
5.1.1 Vial, glass. threaded neck, approximately 22 mL capacity, short style. Vials of other capacities may be substituted as required. When blending light-sensitive components, use amber glass vials or wrap clear glass vials with black tape.
5.1.2 Bottle Cap, molded plastic with TFE-fluorocarbon, polypropylene, or polyethylene conical liner.
5.1.3 Bottle rap, molded plastic with aluminum foil liner. Aluminum foil liners are preferred to other metal liners because they seal better.
5. 1 .4 Mininert Valve, screw cap. 20 mm or appropriate size to match vial size used. These caps are especially valuable for preparing blends that contain volatile components.ASTM D4307 pdf download.