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5.7.2 Extraction fluid # 2: Dilute 5.7 mL glacial CH3CH200H with <br /> reagent water (See Section 5.2) to a volume of 1 liter. When correctly <br /> prepared, the pH of this fluid will be 2.88 + 0.05. <br /> NOTE: These extraction fluids should be monitored frequently for <br /> impurities. The pH should be checked prior to use to ensure that <br /> these fluids are made up accurately. If impurities are found or <br /> the pH is not within the above specifications, the fluid shall be <br /> discarded and fresh extraction fluid prepared. <br /> 5.8 Analytical standards shall be prepared according to the appropriate <br /> analytical method. <br /> 6.0 SAMPLE COLLECTION, PRESERVATION, AND HANDLING <br /> 6.1 All samples shall be collected using an appropriate sampling plan. <br /> 6.2 The TCLP may place requirements on the minimal size of the field <br /> sample, depending upon the physical state or states of the waste and the analytes <br /> of concern. An aliquot is needed for preliminary evaluation of which extraction <br /> fluid is to be used for the nonvolatile analyte extraction procedure. Another <br /> aliquot may be needed to actually conduct the nonvolatile extraction (see Section <br /> 1 .4 concerning the use of this extract for volatile organics) . If volatile <br /> organics are of concern, another aliquot may be needed. Quality control measures <br /> may require additional aliquots . Further, it is always wise to collect more <br /> sample just in case something goes wrong with the initial attempt to conduct the <br /> test. <br /> 6.3 Preservatives shall not be added to samples before extraction. <br /> 6.4 Samples may be refrigerated unless refrigeration results in <br /> irreversible physical change to the waste. If precipitation occurs, the entire <br /> sample (including precipitate) should be extracted. <br /> 6.5 When the waste is to be evaluated for volatile analytes, care shall <br /> be taken to minimize the loss of volatiles. Samples shall be collected and <br /> stored in a manner intended to prevent the loss of volatile analytes (e.g. , <br /> samples should be collected in Teflon-lined septum capped vials and stored at 4 <br /> 'C. Samples should be opened only immediately prior to extraction) . <br /> 6.6 TCLP extracts should be prepared for analysis and analyzed as soon <br /> as possible following extraction. Extracts or portions of extracts for metallic <br /> analyte determinations must be acidified with nitric acid to a pH < 2, unless <br /> precipitation occurs (see Section 7.2.14 if precipitation occurs) . Extracts <br /> should be preserved for other analytes according to the guidance given in the <br /> individual analysis methods. Extracts or portions of extracts for organic <br /> analyte determinations shall not be allowed to come into contact with the <br /> atmosphere (i .e. , no headspace) to prevent losses. See Section 8.0 (QA <br /> requirements) for acceptable sample and extract holding times. <br /> CD-ROM 1311- 6 Revision 0 <br /> July 1992 <br />