. . . . . . . . . . "accepted"@en . . . "Concentration of butane {C4H10 C4_n-alkane CAS 106-97-8} per unit volume of the atmosphere [gaseous phase] by gas chromatography-flame ionisation detection"@en . . . "Unavailable"@en . . "AAX04" . "SDN:P01::GX04GCXX" . . . . . . . .