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通过室内土柱模拟试验研究了三氯乙烯(TCE)在壤土和砂土中的迁移行为。结果表明:TCE初始含量为500 mg/L时,TCE在两种土柱中挥发达到气相平衡的时间均为96 h,在壤土和砂土中达到气相平衡的浓度分别为3.2、3.6 mg/L。砂土柱10 cm处在第7 d时达到浓度峰值,最高浓度为139.5 mg/kg,20、30 cm处均在第17 d时达到浓度峰值;壤土柱10 cm处在第17 d时达到浓度峰值,最高浓度为105.9 mg/kg,其余各点的峰值均高于10 cm处。与壤土相比,砂土中的TCE较易挥发、且往下迁移的速度较快。TCE初始含量为125 mg/L时,砂土柱中TCE挥发达到平衡的时间和浓度为120 h和1.3 mg/L,土柱中各取样点浓度变化规律相似,10 cm处在第7 d时达到浓度峰值,最高浓度为72.91 mg/kg。可见,砂土柱中TCE的加入量越大,挥发达到平衡的时间越短,浓度越高。
The indoor soil column simulation test was conducted to study the migration of trichlorethylene (TCE) in loam and sand. The results showed that when the initial concentration of TCE was 500 mg / L, the time for the vapor phase equilibrium of TCE to volatilize in both soil columns was 96 h, the concentration of TCE reached 3.2 mg / L and 3.6 mg / L respectively in loam and sand . The sandstone column reached its peak at 10 cm on the 7th day with the highest concentration of 139.5 mg / kg and reached the peak at 20 days at the 17th day. The soil column reached the concentration at 10 cm on the 17th day Peak, the highest concentration of 105.9 mg / kg, the rest of the peaks were higher than 10 cm Department. Compared with loam, TCE in sand is more volatile and migrates down faster. At the initial TCE of 125 mg / L, the time and concentration of TCE volatilization in sand column reached equilibrium at 120 h and 1.3 mg / L, The highest concentration reached 72.91 mg / kg. Visible, the larger the amount of TCE added in the sand column, the shorter the time to reach equilibrium, the higher the concentration.