Custom PIONA mix for column control, ASTM D 5134-98(2008) 1264.7 Toluene 0,5% 1240.7 n-Heptane 1% 3248.8 2,3,3-Trimethylpentane 1% 1243.8 2-Methylheptane 1% 1873.8 4-Methylheptane 1% 1242.8 n-Octane 1% Solvent: 2-Methylpentane, 1235.6