With use of a droplet train apparatus, the uptake by I-octanol of gas-phase alpha-pinene, gamma-terpinene, p-cymene, and 2-methyl-2-hexanol was measured as a function of relative humidity and temperature (263-293 K). I-Octanol was selected as a surrogate for hydrophobic oxygenated organic compounds found in tropospheric aerosols. The mass accommodation coefficients (alpha) of gamma-terpinene, p-cymene, and 2-methyl-2-hexanol obtained from these measurements exhibit negative temperature dependences. The upper and lower values of alpha at 265 and 290 K, respectively, are as follows: for gamma-terpinene 0.12 and 0.076; for p-cymene 0.20 and 0.097; and for 2-methyl-2-hexanol 0.25 and 0.11. The uptake of alpha-pinene is solubility limited, yielding values for the product HD11/2 for alpha-pinene in I-octanol (H = Henry's law constant, D-1 = liquid-phase diffusion coefficient). With use of estimated values of A the Henry's law constant is obtained as In H (M/atm) = -(6.59 +/- 1.16) + (3.80 +/- 0.31) x 10(3)/T. The presence of water vapor does not affect the uptake of the above organic gas-phase species. Uptakes of the gas-phase species benzene, H2O, SO2, and H2S were also studied and were found to below the detection limit of the droplet apparatus. This implies that the uptake coefficient for these species is less than 10(-3) for trace gas/liquid droplet interaction times up to 1.5 x 10(-2) s.