Single-sided membrane introduction mass spectrometry for on-line determination of semi-volatile organic compounds in air.

摘要: Construction, optimization, and testing of a novel single-sided configuration for semi-permeable [poly(dimethylsiloxane); PDMS] membrane introduction system mass spectrometry is described. On-line detection semi-volatile organic compounds environmental interest shown, including lindane (a pesticide), hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) (an explosive), butylated hydroxytoluene (BHT) antioxidant), 1,2-dichlorobenzene, dimethylmethyl phosphonate (DMMP) chemical warfare agent simulant) naphthalene. The technique has limits in the sub-ppb range, with rise times 4 to 7 s fall 12 36 response that linear over orders magnitude (from 0.1 ppb 1000 DMMP). cycle time, from crude air sampling acquisition results, approximately 1 min. No sample preparation necessary.