Laserfiche WebLink
Pesticides/PCBs Method T040A <br /> Wo= amount of compound added to primary plug,ng. <br /> If a residue,WZ,is found on the secondary plug,breakthrough has occurred. The sum of W, +WZ must equal <br /> Wo,within 25%or the test is invalid. For most compounds tested by this procedure,%REd values are generally <br /> less than%SE values determined per Section 14.2. The purpose of the static REd determination is to establish <br /> any loss or gain of analyte unrelated to the flow of nitrogen or air through the PUF plug. <br /> 15. Performance Criteria and Quality Assurance <br /> [Note: This section summarizes required quality assurance(QA)measures and provides guidance concerning <br /> performance criteria that should be achieved within each laboratory.] <br /> 15.1 Standard Operating Procedures(SOPs) <br /> 15.1.1 Users should generate SOPS describing the following activities accomplished in their laboratory: (1) <br /> assembly, calibration, and operation of the sampling system, with make and model of equipment used; (2) <br /> preparation,purification, storage,and handling of sampling cartridges; (3)assembly,calibration,and operation <br /> of the analytical system, with make and model of equipment used; and (4) all aspects of data recording and <br /> processing,including lists of computer hardware and software used. <br /> 15.1.2 SOPS should provide specific stepwise instructions and should be readily available to,and understood <br /> by,the laboratory personnel conducting the work. <br /> 15.2 Process,Field,and Solvent Blanks <br /> 15.2.1 One PUF cartridge from each batch of approximately twenty should be analyzed,without shipment <br /> to the field, for the compounds of interest to serve as a process blank. <br /> 15.2.2 During each sampling episode,at least one PUF cartridge should be shipped to the field and returned, <br /> without drawing air through the sampler,to serve as a field blank. <br /> 15.2.3 Before each sampling episode, one PUF plug from each batch of approximately twenty should be <br /> spiked with a known amount of the standard solution. The spiked plug will remain in a sealed container and will <br /> not be used during the sampling period. The spiked plug is extracted and analyzed with the other samples. This <br /> field spike acts as a quality assurance check to determine matrix spike recoveries and to indicate sample <br /> degradation. <br /> 15.2.4 During the analysis of each batch of samples, at least one solvent process blank(all steps conducted <br /> but no PUF cartridge included)should be carried through the procedure and analyzed. <br /> 15.2.5 All blank levels should not exceed 10 ng/sample for single components or 100 ng/sample for multiple <br /> component mixtures(i.e.,for organochlorine pesticides and PCBs). <br /> 15.3 Sampling Efficiency and Spike Recovery <br /> 15.3.1 Before using the method for sample analysis,each laboratory must determine its sampling efficiency <br /> for the component of interest as per Section 14. <br /> 15.3.2 The PUF in the sampler is replaced with a hexane-extracted PUF. The PUF is spiked with a <br /> microgram level of compounds of interest by dropwise addition of hexane solutions of the compounds. The <br /> solvent is allowed to evaporate. <br /> January 1999 Compendium of Methodsjor Toxic Organic Air Pollutants Page 10A-17 <br />