ASTM D4307-17(R2021) pdf free download
ASTM D4307-17(R2021) pdf free download.Standard Practice for Preparation of Liquid Blends for Use as Analytical Standards
1. Scope
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 are 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 compo- nents is such that there is no selective evaporation ofany ofthe 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.) Com- ponents with a vapor pressure higher than butanes are not to be blended. 1.4 The values stated in SI units are to be regarded as the standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards: 2 D1364 Test Method for Water in Volatile Solvents (Karl Fischer Reagent Titration Method) (Withdrawn 2021) 3
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 ofthe final blend is calculated from the mass and purities ofthe pure components. Volume percent composition can be calcu- lated 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 substi- tuted 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 Cap, 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.
6. Reagents and Materials
6.1 Blend Components, high-purity, as required depending on the composition requirements of the proposed blend. 6.1.1 To verify the purity of blend components, analyze each compound by the same technique for which the blend is intended or by another suitable technique. Check for other impurities such as water, if necessary. Water cannot be deter- mined with sufficient accuracy by most GC methods and must be measured by other procedures such as Test Method D1364, or equivalent, and the result used to normalize the chromato- graphic value. If any of the impurities found are other components of the blend, determine their concentrations and make appropriate corrections.
