National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Deso rb (steps 5 through 7 ) and analyze together with working standards (steps 11 and 12) . e. Prepare a graph of DE vs. μg isophorone recovered. 10. Analyze three quality control blind spikes and three ana lyst spikes to insure that the calibration graph and DE graph are in control. ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Allow to stand 30 min with occasional agitation and place on a rotary mixer for 1.5 hours. CALIBRATION AND QUALITY CONTRO L: 8. Calibrate daily with at least six working standards over the range 6 to 831μg isophorone per sample. a. Add known amounts of isophorone to a 10-mL volumetric flasks and dilute to the mark. b. Analyze together with samp les and blanks (steps 11 and 12) . c. Prepare calibra tion gra ph (p eak area vs. μg isop horo ne) . ”
National Institute for Occupational Safety and Health, NIOSH Manual of Analytical Methods… (1994)
“ Initial results using this approach were plagued by varying recoveries and poor peak resolution which was so lved by using a Stabilwax-DA fused silica capillary colum n and a base-deactivated inlet liner in th e gc injec tion port. T he base-deactivate d inlet liner should be replaced after 35-40 injections. Additionally, the samples were placed on a rotary mixer fo r 1.5 hours after the addition of the diethyl ether. These changes resulted in an average recovery of 94.1% over the range of 55 to 831μg and the LOD being lowered to 1 μg/sample. ”
