ASTM D808 Chlorine in New and Used Petroleum Products (Bomb Method)
5. Apparatus
5.1 Bomb, having a capacity of not less than 300 mL, so constructed that it will not leak during the test, and that quantitative recovery of the liquids from the bomb may be readily achieved. The inner surface of the bomb may be made of stainless steel or any other material that will not be affected by the combustion process or products. Materials used in the bomb assembly, such as the head gasket and lead-wire insulation, shall be resistant to heat and chemical action, and shall not undergo any reaction that will affect the chlorine content of the liquid in the bomb.
5.2 Sample Cup, platinum, 24 mm in outside diameter at the bottom, 27 mm in outside diameter at the top, 12 mm in height outside, and weighing 10 to 11 g.
5.3 Firing Wire, platinum, No. 26 B & S gage 0.41 (16 thou), 27 SWG or equivalent.
5.4 Ignition Circuit, capable of supplying sufficient current to ignite the nylon thread or cotton wicking without melting the wire.
5.4.1 The switch in the ignition circuit shall be of a type that remains open, except when held in closed position by the operator.
5.5 Nylon Sewing Thread, or Cotton Wicking, white.
5.6 Filter Crucible, fritted-glass, 30-mL capacity, medium porosity.
6. Reagents and Materials
6.1 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.
6.2 Purity of Water - Unless otherwise indicated, references to water shall be understood to mean reagent water as defined by Type II or III of Specification D1193.
6.3 Nitric Acid (1 + 1) - Mix equal volumes of concentrated nitric acid (HNO3, sp gr 1.42) and water.
6.4 Oxygen, free of combustible material and halogen compounds, available at a pressure of 41 kgf/cm2 (40 atmos). (Warning - Oxygen vigorously accelerates combustion.)
6.5 Silver Nitrate Solution (50 g AgNO3/L) - Dissolve 50 g of silver nitrate (AgNO3) in water and dilute to 1 L.
6.6 Sodium Carbonate Solution (50 g Na2CO3/L) - Dissolve 50 g of anhydrous Na2CO3, 58.5 g of Na2CO3•H2O, or 135 g of Na2CO3•10 H2O in water and dilute to 1 L.
6.7 White Oil, refined.
6.8 Quality Control (QC) Samples, preferably are portions of one or more liquid petroleum materials that are stable and representative of the samples of interest. These QC samples can be used to check the validity of the testing process as described in Section 10.
7. Sampling
7.1 Take samples in accordance with the instructions in Practice D4057.
7.2 Take care that the sample is thoroughly representative of the material to be tested and that the portion of the sample used for the test is thoroughly representative of the whole sample.
