An Improved Impregnated-filter Method for Measuring Low-levelConcentrations of Toluene

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An improved method was developed and validated for measuring low-level concentrations of toluene diisocyanates (TDls) in air. The method is based on OSHA Method 42 for industrial applications. Airborne TDls were trapped on a 25-mm glass-fiber filter impregnated with 50 pg of 1-(2-pyridy1)piperazine. A filter holder was constructed to minimize contamination and losses of the analytes. The derivatized TDls were extracted by immersion of the filter in a small volume of solvent. The analysis was performed with a high performance liquid chromatograph equipped with a fluorescence detector and a CIB base-deactivated silica column. The modified method has a lower limit ... continued below

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Mahanama, K.R.R. & Hodgson, A.T. February 1, 1995.

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An improved method was developed and validated for measuring low-level concentrations of toluene diisocyanates (TDls) in air. The method is based on OSHA Method 42 for industrial applications. Airborne TDls were trapped on a 25-mm glass-fiber filter impregnated with 50 pg of 1-(2-pyridy1)piperazine. A filter holder was constructed to minimize contamination and losses of the analytes. The derivatized TDls were extracted by immersion of the filter in a small volume of solvent. The analysis was performed with a high performance liquid chromatograph equipped with a fluorescence detector and a CIB base-deactivated silica column. The modified method has a lower limit of quantitation of 0.02 ppb in 15 L of air for both 2,4-toluene diisocyanate (2,4-TDI) and 2,6-toluene diisocyanate (2,6-TDI), which is about a fifteen-fold enhancement over Method 42. The recovery efficiencies and 95% confidence intervals for vapor-spiked filters were 77 {+-} 6 percent for 2,4-TDI and 69 {+-} 10 percent for 2,6-TDI. The precision of replicate analyses was ten percent or better. The method was used to screen flexible polyurethane foam for emissions of unreacted TDls.

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11

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  • Report No.: LBL--36641
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.2172/915405 | External Link
  • Office of Scientific & Technical Information Report Number: 915405
  • Archival Resource Key: ark:/67531/metadc878402

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  • February 1, 1995

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 2:53 p.m.

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Mahanama, K.R.R. & Hodgson, A.T. An Improved Impregnated-filter Method for Measuring Low-levelConcentrations of Toluene, report, February 1, 1995; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc878402/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.