ASTM D848 Test Method for Acid Wash Color of Industrial Aromatic Hydrocarbons
8. Hazards
8.1 Consult current OSHA regulations, supplier's Material Safety Data Sheets, and local regulations for all materials used in this test method.
8.2 When handling strong acids or acid cleaning solutions, wear proper personnel protective equipment.
9. Sampling
9.1 Sample the material in accordance with Practice D3437.
10. Cleaning of Containers
10.1 Clean new containers (Section 6) with a cleaning solution that will not impact the results, such as a chromic acid substitute, rinse with tap water followed by distilled water, and dry in an oven set at a minimum of 105°C for at least 1 h. Likewise, clean all other glassware used in this test method.
11. Preparation of Reference Color Standards
NOTE 1 - Purchase of solutions or reference color standards, or both, is allowed. The user of this standard assumes the responsibility of ensuring any purchased solutions or standards are prepared with materials that meet the requirements expressed in the Reagents section of this standard. Likewise, the user of this standard assumes the responsibility of ensuring any purchased solutions or standards are prepared as expressed in this section.
11.1 Stock Solutions - Prepare the following basic reagent solutions for use in preparing the reference color standards:
11.1.1 Solution A - Dissolve 59.50 g of CoCl2•6H2O in HCl (1 + 39) and make up to 1 L in a volumetric flask with HCl (1 + 39).
11.1.2 Solution B - Dissolve 45.054 g of FeCl3•6H2O in HCl (1 + 39) and make up to 1 L in a volumetric flask with HCl (1 + 39).
11.1.3 Solution C - Mix 3 1/2 volumes of Solution A with 36 1/2 volumes of Solution B and dilute with 90 volumes of water.
11.1.4 Solution D - Mix 3 1/2 volumes of Solution A with 36 1/2 volumes of Solution B.
11.1.5 Solution E - Prepare an aqueous solution of K2CrO4 saturated at 21°C.
11.1.6 Solution F - Prepare an aqueous solution of K2Cr2O7 saturated at 21°C and dilute with an equal volume of water.
11.2 Prepare reference color standard solutions having the following compositions and numbered as specified below. It is not required to make each color standard. Only those reference color standards that bracket the samples being evaluated must be utilized.
No.0 - Distilled water.
No.1 - 1 volume of Solution C plus 1 volume of water.
No.2 - 5 1/2 volumes of Solution C plus 2 volumes of water.
No.3 - Solution C.
No.4 - 1 volume of Solution D plus 1 volume of water.
No.5 - 5 1/2 volumes of Solution D plus 2 volumes of water.
No.6 - Solution D.
No.7 - 5 volumes of Solution E plus 2 volumes of water.
No.8 - Solution E.
No.9 - 7 volumes of Solution E plus 1/2 volume of Solution F.
No.10 - 6 1/2 volumes of Solution E plus 1 volume of Solution F.
No.11 - 5 1/2 volumes of Solution E plus 2 volumes of Solution F.
No.12 - 1 volume of Solution E plus 1 volume of Solution F.
No.13 - 2 volumes of Solution E plus 5 volumes of Solution F.
No.14 - Solution F.
11.3 Rinse the No. 0 container (5.1) and its glass stopper three times with water, fill with water, and stopper. Rinse the No. 1 container and its stopper three times with reference color standard solution No. 1 (Section 11.2), fill with this solution, and stopper. In this way, prepare the set of containers of color standards from 0 through 14 having the compositions shown for the corresponding color solution standards in 11.2. When filling the French square bottles, leave 1/4 in. (6 mm) of vapor space below the neck of the bottle. Seal each container with paraffin to prevent loss by evaporation or seepage.
NOTE 2 - It is recommended color standards be prepared annually from fresh solutions.
