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4D D 4874 <br /> SIDE VIEW <br /> _ELL All <br /> GASKET <br /> TOP VIEW <br /> RADIAL GROOVES <br /> 0 -4 0 <br /> 0 0 <br /> ,tOLUMN <br /> WALL 00) 0 <br /> 0 <br /> END PLATE: <br /> -Eff/_EEr -Eff/ -Eff �F <br /> CASKET GYLINDRICAL SQUARE <br /> DIFFUSION DISK BASE PLATE <br /> FIQ I Colurrici Apparatus <br /> in a bed of granular Material. Also called the interstitial 5.1 Columns: <br /> volume. 5.1.1 The column body is Constructed of glass pipe, 300 <br /> 3.2 Soveral terms used in this test method are defined in mm(12 in.)in length,with an inside diameter of 100 mm(4 <br /> Terminology D 1129. in.). The cylinder wad] must be of sufficient thickness, <br /> approximately 6 Trim (1/4 in.), to withstand the operating <br /> 4. Significance and Use pressure. <br /> 4.1 This test method is intended to provide an aqueous 5.1.2 End plates are constructed of stairiless steel. They <br /> leaching of a material in a dynamic partitioning manner. are attached by means of eight,6-mm (I/min.)threaded rods <br /> 4.2 Specific operating conditions for the column can be or any other means which ensures a leakproof seal. <br /> selected to satisfy the objectives of individual studies. An 5.1.3 Gaskets, one at each end of the column, are con- <br /> understanding of the fundamental principles governing siructed of chemically inert materials, and are as thin as <br /> column leaching is necessary in the selection of appropriate possible while still providing a good seal. The gasket diam- <br /> conditions. References(1-3)9 provide useful information on eter should overlap the inside column diameter by 3 mm(1/8 <br /> these principles. in.)to prevent the gasket from being forced out while under <br /> 4.3 The column apparatus is constructed of materials that pressure, <br /> Techniques other than gaskets for providing a seal <br /> permit the generation of a leachate which is suitable for low between the column and end plates are allowed provided the <br /> concentration organic analysis for sernivolatile and nonvola- technique used is specified in the report. <br /> tile compounds as well as inorganic species. 5.1.4 Flow distribution disks must be constructed of <br /> S. Apparatus(See Fig. 1) simered stainless steel, with a nominal pore diameter of 70 <br /> pm. The disk thickness shall be 6 mm (1/4 in.), with a <br /> diameter equal to the inside diameter of the column, <br /> v The boldface numbers in gnwenthes refer W the list of nvfercn at the end approximately 100 mm (4 in.). The disk shall have eight <br /> of this swndord. evenly spaced grooves;each of which is 3 mm(IA in.)wide,3 <br />