Xu Wei, Zhao Yong-sheng, Li Sui, Dai Ning
College of Environment and Resource, Jilin University, Changchun 130026, China.
Huan Jing Ke Xue. 2008 Aug;29(8):2336-40.
Adsorption of Tween 80 on sand was investigated, and the effect of inorganic salts (CaCl2), anionic surfactant (SDS) and lignosulphonates (sodium lignosulphonate or ammonium lignosulphonate) on the adsorption of Tween 80 on sand were evaluated at 25 degrees C. The results show that saturated adsorption amount of Tween 80 on sand enhance when CaCl2 or SDS is added into flushing solution of Tween 80. And the adsorption of Tween 80 on sand increase with the increase of molar fraction of CaCl2 or SDS in mixed flushing solution. And adsorption amount of Tween 80 on sand also enhance when SDS is added into sand firstly. The effects of mixing ratios and addition order of lignosulphonates on adsorption of Tween 80 were considered. The results show that with the increase of molar fraction of lignosulphonates in mixing flushing solution, adsorption amount of Tween 80 on sand decrease. The adsorption amount of Tween 80 reduce 20%-75% due to the exist of ammonium lignosulphonate is superior to sodium lignosulphonate (10%-60%) when mix the lignosulphonates-Tween 80 at the total mass ratios of 1:10, while the adsorption amount of Tween 80 reduce 70%-90% at the total mass ratios of 1:2. Lignosulphonates added into sand firstly is more efficient than that together. Therefore,use of lignosulphonates as a preflush can reduce the adsorption of surfactants on sand and is a better method to applied in in situ flushing.
研究了吐温80在砂上的吸附情况，并在25℃下评估了无机盐（CaCl₂）、阴离子表面活性剂（SDS）和木质素磺酸盐（木质素磺酸钠或木质素磺酸铵）对吐温80在砂上吸附的影响。结果表明，当在吐温80冲洗液中加入CaCl₂或SDS时，吐温80在砂上的饱和吸附量增加。并且吐温80在砂上的吸附量随混合冲洗液中CaCl₂或SDS摩尔分数的增加而增加。当首先将SDS加入砂中时，吐温80在砂上的吸附量也会增加。考虑了木质素磺酸盐的混合比例和添加顺序对吐温80吸附的影响。结果表明，随着混合冲洗液中木质素磺酸盐摩尔分数的增加，吐温80在砂上的吸附量降低。当木质素磺酸盐与吐温80以总质量比1:10混合时，由于木质素磺酸铵的存在，吐温80的吸附量降低20%-75%，优于木质素磺酸钠（10%-60%），而在总质量比1:2时，吐温80的吸附量降低70%-90%。首先将木质素磺酸盐加入砂中比一起加入更有效。因此，使用木质素磺酸盐作为前置冲洗液可以减少表面活性剂在砂上的吸附，是一种更适合应用于原位冲洗的方法。
