9USEPA. Environmental technology verification report field- portable gas chromatograph/mass spectrometer inficon, inc. , HAPSITE [ EB/ OL ]. http://www, epa. gov/etv/pdfs/vrvs/01_vr_inf.pdf, 1998 - 11.
10USEPA. Innovations in site characterization technology evaluation: real- time VOC analysis using a field portable GC/MS[ EB/OL]. http://www, epa. gov/tio/download/char/mpa_ gc - ms _ report, pdf, 2001 -8.