采用海滨浴场的沙为吸附剂,0号柴油为吸附质,研究了溶解性石油烃(DPHs)在砂上的吸附及解吸规律。研究发现,砂对DPHs的吸附和解吸均符合一级反应模式;油的解吸速率比吸附速率慢13倍,并且有约25%的油残存于砂上,因而污染威胁会在较长时间内存在。砂对海水中DPHs的吸附等温线可以用Henry型等温式描述,温度越高,海水中的油向砂上转移的量越小。通过吸附热力学分析,得出该吸附属于物理吸附范畴。

The absorption and desorption of dissolved petroleum hydrocarbons (DPHs) in seawater are studied using sands from a bathing beach as absorbent material and 0# diesel as absorbate. The results show the absorption and desorptionof DPHs on sands fits the first-order reaction model. The rate of desorption is slower than that of absorption up to 13 times, and about 25% oil becomes residues in the sands. Thus an environmental threat may have been in existence for a long time. The absorqtion isotherms can be described as Henry's equation, and the transportation amount of DPHs from seawater to sands decreases with the increase of temperature. The absorption is of to physical absorption according to the thermodynamic analysis.