烷烃与海水界面张力的研究

STUDY ON ALKANE-SEAWATER INTERFACIAL TENSION

于1991年3月－1992年6月间用液体积法较系统地测定正己烷、正庚烷、正辛烷、异辛烷、正十二烷、正十六烷和煤油与海水在不同的温度（16－40℃）和盐度（10—40）范围内的界面张力，测定值的相对误差≤0．5％。对数据进行统计处理后，归纳出所研究烷烃－海水界面张力与温度和盐度的经验关系式，计算值与实验值相对误差≤0．5％。

The respective alkane (n - c6, n - c7, n - c8, i - c8, n - c12, n - c16 and kerosene, respectively)- seawater interfacial tension (I.T. ) in the temperature range of 16 - 40℃ and salinity range of 10- 40 were determined with the drop - volume method by the authors from 1991 to 1992. The relative standard deviation of measured values ≤0. 5%. Seven empirical equations obtained on the basis of these measurements directly relates the alkanes- seawater I.T. with the temperature and salinity. The results show that all the alkanes-seawater I. T. decrease linearly with the rise of temperature. The salinity coefficient of the (n- c6, n- c7, n- c8 and i- c8 ) - seawater I.T. is positive, negative for n- c12 or n- c16. A model of adsorption at the alkane-seawater interface is presented for interpretation of this change of I .T. with salinity.