EPA Method 1311 Toxicity Characteristic Leaching Procedure (TCLP)
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ID： |
45ED3AB2D0B842B1B4DA46A958B325C8 |
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文件大小(MB)： |
0.19 |
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页数： |
35 |
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文件格式： |
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日期： |
2003-1-16 |
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文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
CD-ROM 1311- 1 Revision 0,July 1992,METHOD 1311,TOXICITY CHARACTERISTIC LEACHING PROCEDURE,1.0 SCOPE AND APPLICATION,1.1 The TCLP is designed to determine the mobility of both organic and,inorganic analytes present in liquid, solid, and multiphasic wastes.,1.2 If a total analysis of the waste demonstrates that individual,analytes are not present in the waste, or that they are present but at such low,concentrations that the appropriate regulatory levels could not possibly be,exceeded, the TCLP need not be run.,1.3 If an analysis of any one of the liquid fractions of the TCLP,extract indicates that a regulated compound is present at such high concentrations,that, even after accounting for dilution from the other fractions of the,extract, the concentration would be above the regulatory level for that compound,then the waste is hazardous and it is not necessary to analyze the remaining,fractions of the extract.,1.4 If an analysis of extract obtained using a bottle extractor shows,that the concentration of any regulated volatile analyte exceeds the regulatory,level for that compound, then the waste is hazardous and extraction using the ZHE,is not necessary. However, extract from a bottle extractor cannot be used to,demonstrate that the concentration of volatile compounds is below the regulatory,level.,2.0 SUMMARY OF METHOD,2.1 For liquid wastes (i.e., those containing less than 0.5% dry solid,material), the waste, after filtration through a 0.6 to 0.8 μm glass fiber,filter, is defined as the TCLP extract.,2.2 For wastes containing greater than or equal to 0.5% solids, the,liquid, if any, is separated from the solid phase and stored for later analysis;,the particle size of the solid phase is reduced, if necessary. The solid phase,is extracted with an amount of extraction fluid equal to 20 times the weight of,the solid phase. The extraction fluid employed is a function of the alkalinity,of the solid phase of the waste. A special extractor vessel is used when testing,for volatile analytes (see Table 1 for a list of volatile compounds). Following,extraction, the liquid extract is separated from the solid phase by filtration,through a 0.6 to 0.8 μm glass fiber filter.,2.3 If compatible (i.e., multiple phases will not form on combination),the initial liquid phase of the waste is added to the liquid extract, and these,are analyzed together. If incompatible, the liquids are analyzed separately and,the results are mathematically combined to yield a volume-weighted average,concentration.,1 VITON?is a trademark of Du Pont.,CD-ROM 1311- 2 Revision 0,July 1992,3.0 INTERFERENCES,3.1 Potential interferences that may be encountered during analysis are,discussed in the individual analytical methods.,4.0 APPARATUS AND MATERIALS,4.1 Agitation apparatus: The agitation apparatus must be capable of,rotating the extraction vessel in an end-over-end fashion (see Figure 1) at,30 + 2 rpm. Suitable devices known to EPA are identified in Table 2.,4.2 Extraction Vessels,4.2.1 Zero-Headspace Extraction Vessel (ZHE). This device is,for use only when the waste is being tested for the mobility of volatile,analytes (i.e., those listed in Table 1). The ZHE (depicted in Figure 2),allows for liquid/solid separation within the device, and effectively,precludes headspace. This type of vessel allows for initial liquid/solid,separation, extraction, and final extract filtration without opening the,vessel (see Section 4.3.1). The vessels shall have an internal volume of,500-600 mL, and be equipped to accommodate a 90-110 mm filter. The devices,contain VITON?1 O-rings which should be replaced frequently. Suitable ZHE,devices known to EPA are identified in Table 3.,For the ZHE to be acceptable for use, the piston within the ZHE,should be able to be moved with approximately 15 psi or less. If it takes,more pressure to move the piston, the O-rings in the device should be,replaced. If this does not solve the problem, the ZHE is unacceptable for,TCLP analyses and the manufacturer should be contacted.,The ZHE should be checked for leaks after every extraction. If the,device contains a built-in pressure gauge, pressurize the device to,50 psi, allow it to stand unattended for 1 hour, and recheck the pressure.,If the device does not have a built-in pressure gauge, pressurize the,device to 50 psi, submerge it in water, and check for the presence of air,bubbles escaping from any of the fittings. If pressure is lost, check all,fittings and inspect and replace O-rings, if necessary. Retest the,device. If leakage problems cannot be solved, the manufacturer should be,contacted.,Some ZHEs use gas pressure to actuate the ZHE piston, while……
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