National Institute for Occupational Safety and Health

“ Breakthrough (5% on the backup section) occurred at 33 min when sampling a concentration of 247 0 m g/m 3 in dry air at a flow rate of 0.185 L/min., corresponding to a capa city of 15 m g. The average DE was 98% over the range 1.8 to 7.1 mg ethyl ether per sample. Sample storage stability was not determined. Issue 3 The sensitivity of this m etho d for ethyl ethe r was lowered to cover a range from approximately 10 times the LOQ (based upon an improved LOD of 0.2 μg/sample) to 500 times (0.25 REL) the LOQ. The desorption efficiency was tested at four levels over the range of 8 - 428 :g/sample. ”

“ Ethyl ether is a dangerous fire and explosion hazard (flash point = -45 oC) and tends to form explosive peroxides. Carbon disulfide is toxic and flamm able (flash point = -30 oC) . Prepare samples and standards in a well-ventilated hood.
SAMPLING: 1. Calibrate each personal sampling pump with a representative sampler in line. 2. Break the ends of the sampler imm ediately before sampling. Attach sampler to personal sampling pump with flexible tubing. 3. ”

“ If peak area is above the linear range of the working standards, dilute an aliquot of the desorbed sam ple with carbon disulfide, reanalyze , and apply the appropriate dilution fa cto r in the calculations. ”