NIST Standard Reference Material (SRM) were digested and analyzed for PM-PbĬontent. Was used to calculate ambient PM-Pb mass concentrations. Were used to determine Pb concentration in solution, and the ambient air volume sampled Internal standards, with rhodium used to correct the Pb intensities. Select other elements) signal intensities were corrected using rhodium and rhenium #Appendices of lord of the rings pdf verification#Was re-evaluated after every 10 samples using blank DAMMB solution and aĬoncentration verification solution made from DAMMB and 1ppb Pb. For each analysis batch, the performance of the ICP-MS Number of DAMMB samples with known amounts of Pb. Voltage was optimized prior to each analysis batch. Samples were analyzed using an ELAN DRC II Inductively Coupled Plasma Mass Using 0.45 µm pore size Acrodisc filters (Pall Corp., Port Washington, NY) and thenĭiluted to a final volume of 15 ml with de-ionized water to have a nitric acid content of Digested samples and QA/QC blanks were filtered Using different glassware for the purpose of making ICP-MS calibration andĬoncentration verification standards. Stage (3) a filter blank that used an unexposed filter that was subjected to the sameĭigestion method as the exposed filter samples and (4) a digested acid matrix matchedīlank (DAMMB), prepared identically to the reagent blank but in greater volume and With a known amount of the multi-element standard before the first hot-block digestion Process (2) a spiked reagent blank, prepared identically to the reagent blank and spiked The same amount of acid that was added to a vial which was subjected to the digestion QA/QC measures for each set of digestions included (1) a reagent blank, prepared using Performed, again with the hot-block at 90Â☌ for 2 hours. Recovery and complex the excess hydrofluoric acid. The first stage, samples were allowed to cool and then boric acid was added to enhance Hours using a hot-block (ModBlock, CPI International, Santa Rosa, CA) at 90Â☌. Hydrofluoric acid were added to the sample vials and the samples were digested for 2 Was extracted using a two-stage digestion process. Their support rings and placed into polypropylene vials. ICP-MS Analysis for Total PM-Pb and Pb IsotopesĮxposed filters were digested and analyzed for Pb by ICP-MS. In such cases, the flow rate was rechecked after the end of the sampling event. Flow rates were checked nominallyĮvery 3 days and with recalibration performed if the deviation from setpoint exceededĥ%. Traceable flow meter (deltaCal, BGI, Waltham, MA). The BGI samplers were operated at an actual flow rate of 16.7 LPM, which is the designįlow rate for the aforementioned inlets. Using ice packs and insulated shipping containers. Irregularities and were then placed in a freezer for storage. Filter holders and screens were cleaned daily with de-ionized water.Īfter sampling, the filters were again visually inspected for puncture holes and other Prior to use, all filters were visually inspected for puncture holes or Samples were collected onto 47mm, 2.0 µm pore size Teflon® filters (PT47, MTL Corp., Total Suspended Particulate (TSP) samples were collected using PQ100 samplers with A louvered inlet with PM10 impactorâthe standardĬonfiguration for ambient PM10 samplingâwas used upstream of the PM2.5 cyclone. Sampling and for this study was used with BGI Very Sharp Cut Cyclones (VSCC) toĪchieve PM2.5 cutpoints. EPA Federal Reference Method (FRM) for PM10 #Appendices of lord of the rings pdf portable#Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.Īirborne PM samples were collected using Model PQ100 portable samplers (BGI, Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book.
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