Cahn C 31 Microbalance Manual Dexterity

Coal Tar Pitch Volatiles (CTPV) Coke Oven Emissions (COE) Selected Polynuclear Aromatic Hydrocarbons (PAHs) Related Information: Chemical Sampling -, Method no.: 58 Matrix: Air Procedure: Air samples are collected by drawing known amounts of air through cassettes containing glass fiber filters (GFF). The filters are analyzed by extracting with benzene and gravimetrically determining the benzene-soluble fraction (BSF). If the BSF exceeds the appropriate PEL, then the sample is analyzed by high performance liquid chromatography (HPLC) with a fluorescence (µL) or ultraviolet (UV) detector to determine the presence of selected polynuclear aromatic hydrocarbons (PAHs). Recommended air volume and sampling rate: 960 L at 2.0 L/min Special requirements: Each GFF must be transferred to a separate scintillation vial after sampling and the vial sealed with a PTFE-lined cap.

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Samples must be protected from direct sunlight. Status of method: Evaluated method. This method that has been subjected to the established evaluation procedures of the Organic Methods Evaluation Branch. July 1986 Donald Burright.

Table 1.2.1.2. Analytical Detection Limits compound ng/injection detector* PHEN PHEN ANTH PYR CHRY BαP 0.132 0.910 0.090 0.960 0.386 0.175 UV(254 nm) FL FL FL FL FL * Fluorescence was more sensitive than UV for each PAH except PHEN 1.2.2. Detection limits of the overall procedure The detection limits of the overall procedure are listed below.

These are the amounts of analyte, determined from -, which when spiked onto the sampling device would allow recovery of an amount of analyte equivalent to the detection limits of the analytical procedure. Reliable Quantitation Limits BSF PHEN ANTH PYR CHRY BαP µg/sample µg/m 3 ppb 33.1 34.5 -- 0.71 0.74 100 0.064 0.066 9 1.08 1.13 140 0.262 0.273 29 0.199 0.207 20 The reliable quantitation limit and detection limits reported in the method are based upon optimization of the instrument for the smallest possible amount of analyte. Electronic Test Instruments Robert Witte Pdf To Word. When the target concentration of an analyte is exceptionally higher than these limits, they may not be attainable at the routine operating parameters 1.2.4. Sensitivities The sensitivities of the analytical procedure over a concentration range representing about 0.5 to 2 times the target concentrations are listed below. These values were determined by the slope of the calibration curves.

() The sensitivity will vary with the particular instrument used in the analysis. The values listed were obtained using an µL detector. Precision of the Overall Procedure compound percent BSF PHEN ANTH PYR CHRY BαP 16.2 11.8 13.4 13.0 12.3 11.3 1.2.8. Reproducibilities Six samples, spiked with coal tar by liquid injection, and a draft copy of this procedure were given to a chemist unassociated with this evaluation. The samples were analyzed after 21 days of storage at about 22°C. Another set of six samples, spiked with PAHs by liquid injection, and a draft copy of this procedure were given to another chemist unassociated with this evaluation. The samples were analyzed after 3 days of storage at about 22°C.

The average recoveries are listed below. Reproducibilities compound mean percent BSF PHEN ANTH PYR CHRY BαP 94.2 98.0 90.4 101.4 98.7 100.6 5.4 3.4 2.4 3.4 2.7 3.0 1.3. Advantages 1.3.1. Recovery of the analytes is improved by placing the GFF in sealed glass vials before shipment. The amount of benzene required for each sample is reduced from 10 mL to 3 mL per sample. Site Feasibility In Clinical Trials. This reduces the exposure to a suspected human carcinogen. The reliable quantitation limits are much lower than those of the previously used procedure.