ASTM D4059 Test Method forAnalysis of Polychlorinated Biphenyls in Insulating Liquids by Gas Chromatography
9. Reagents and Materials
9.1 Standards - Sample quantities, or analyzed solutions, of Aroclors 1242, 1254, and 1260.

9.2 Insulating Oil, fresh unused, of the type being analyzed, PCB-free.

NOTE 3 - Mineral insulating oils with a viscosity approximately 10 cSt at 40°C are produced by a number of petroleum companies and have been found suitable for this purpose.

9.3 Solvent - n-Hexane, Heptane or 2,2,4-trimethylpentane (isooctane), pesticide grade.

9.4 Sulfuric Acid, concentrated, AR grade.

9.5 Adsorbent for polar, electrophilic impurities.

NOTE 4 - Florisil (60/100 mesh) has been found suitable for this purpose. Before use, activate each batch by heating overnight at 130°C in a foil-covered glass container. Florisil heated to appreciably higher temperatures can absorb some PCB. Test the effect of each activated batch on a standard Aroclor solution.

9.6 Dicapthon [phosphorothioic acid-O(2-chloro-4-nitre-phenyl)-O,O-dimethylester] to determine detector sensitivity.

9.7 p, p'-DDE [1,1'-bis(4-chlorophenyl)ethane] to establish relative retention times.

NOTE 5 - Mixtures of Aroclors 1242, 1254, and 1260 may be used conveniently for standards.

10. Sampling
10.1 Obtain the test specimen of oil in accordance with Test Method D923.