11. Ethylene glycol in biological fluids can be determined by gas chromatography . 12. HPLC is used for nonvolatile mixtures that would not be suitable for gas chromatography . 13. Back in the lab, he analyzed the substance on a gas chromatography mass spectrometer. 14. To find steroid traces in urine, scientists use gas chromatography and mass spectrometry testing. 15. Also, gas chromatography "'seems "'much more complicated than paper chromatography. 16. Gas chromatography and mid-infrared spectroscopy are other methods in use.17. Using gas chromatography , the quantity of ethylene they emitted can also easily be measured. 18. Gas chromatography / mass spectrometry ( GC / MS ) is the recommended confirmatory method.19. Martin later worked on gas chromatography , which uses a porous solid to separate chemical vapors. 20. GC-MS ( Gas Chromatography -Mass Spectroscopy ) is generally considered the gold standard for forensic analysis.
