ASTM D848 Test Method for Acid Wash Color of Industrial Aromatic Hydrocarbons
6. Apparatus
6.1 Containers for Color Standards - Clear and unblemished, clean, French square, flint-glass, flat-bottom, glass-stoppered, 1-oz capacity bottles holding 31 to 33 mL when filled to the neck. The bottles shall be labeled with the reference number of the color standard they contain (see 11.2).
6.2 Test Containers - Containers exactly like those described in 6.1 except that each French square bottle shall be marked by etching to show when the bottle contains the volume of 7 and 28 mL, respectively. Colored crayons and similar markers shall not be used for marking the bottles.
7. Reagents
7.1 Purity of Reagents - Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where such specifications are available. Other grades may be used provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening the accuracy of the determination.
7.2 Purity of Water - Unless otherwise indicated, references to water shall be understood to mean distilled water, Type I or II as described in Specification D1193.
7.3 Cobalt Chloride (CoCl2•6H2O).
7.4 Ferric Chloride (FeCl3•6H2O).
7.5 Hydrochloric Acid (1 + 39) - Mix 25 mL of hydrochloric acid (31 weight % HCl) with 975 mL of water.
7.6 Potassium Chromate (K2CrO4).
7.7 Potassium Dichromate (K2Cr2O7).
7.8 Sulfuric Acid (96 more or less 0.5 weight % H2SO4).
7.9 Sulfuric Acid (78 more or less 0.5 weight % H2SO4).
