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Tr=22 ENVIRONMENTAL HEALTH 466700 (RpMgr IL Na 3-44ZA) (p. 1800.81) (e) The WET extraction solution shall consist of 0.2 M sodium citrate at pH 5.0 * 0.1,which ispprepared by titrating an approppnate amount of analytical grade citric acid in deionized water with 4.0 N NaOH,except that the extraction solution for the determination of chromium (VI) shall consist of deionized water. (f) The extraction procedure shall be as follows: (1) Fifty grams of sample,or less if it is a type ii sample prepared pursuant to subsection (c)(2),obtained pursuant to subsection (c) or (d) of this section shall be placed in a cleanpolyethylene or glass container designated the Treat- ment,capable of physically withstanding the extraction procedure and which was rinsed previously with,in succession,an aqueous 1:1 ratio by volume nitric acid solution and deionized water.If the extract will be analyzed for any of the organic substances listed in Section 66699(c), a glass container shall be used. Furthermore,a container of the same size,shape and material shall be used for an extraction designated as the Blank,which shall be carried through the same procedure as the Treatment,but without addition of the sample. (2) Five hundred milliliters of extraction solution,or less if the waste sample is a type ii sample repared pursuant to subsection (c)(2) shall be added to the Treatment and Blank containers,which shall be then fitted with covered air scrubbers extended well into the extraction solutions and flushed vigorously with nitrogen gas for 15 minutes so as to remove and exclude atmos heric oxygen from the extraction medium. If the sample is to be analyzed for any volatile substance, such as trichloroethylene, the sample shall be added after deaeration with nitrogen to avoid volatilization loss.After deaeration the con- tainers shall be quickly sealed with tightly fitting caps and agitated,using a table shaker,an overhead stirrer or a rotary extractor,operated at a speed which shall maintain the sample in a state of vigorously apftated suspension. Required equipment is described in test method 1310 in 'Test Methods for Evaluating Solid Waste,Physical/Chemical Methods",SW 846,2nd edition U.S. Environ- mental Protection Agency, 1982.The temperature during the extraction shall be maintained between 20 and 40 degrees centigrade.After 48 hours of extract- ing,the contents of the Treatment and Blank containers shall be either filtered directly or centrifuged and then filtered.Filtering shall be through a medium porosity prefilter and then through a 0.45 micron membrane filter, using a clean, thick-walled suction flask. For coarser solids, prefiltration shall not be necess . Pressure filtration shall be an optional alternative to vacuum filtra- tion.If�e extracts are fust centrifuged,glass or polyethylene bottles shall be used as prescribed for extraction. For very fine solids,centrifuging at as high as 10,000 X G may be necessary. After centrifugation, the liquids shall be de- canted,prefiltered if necessary,and then passed through a 0.45 micron mem- brane filter. All filters shall be of low and identified extractable heavy metals, fluoride and organic chemicals content. (3) If the filtered extracts are to be analyzed only for the metal elements listed in Section 66699(b),the filtered extracts from the Treatment and Blank shall be transferred to clean polyethylene bottles and acidified with nitric acid to five percent by volume acid content soon after each extract is filtered. For those wastes or waste materials classified under subsection (c)(2), the Treat- ment shall be the Initial Filtrate combined with the extract generated by the WET extraction of the initially separated solids. Similarly the Blank in this instance shall be the filtrate generated by the WET Blank accompanying the initially separated solids,to which is subsequently added a volume of deionized