邻苯二胺对铜在红壤和砂姜黑土中吸附和解吸的影响

EFFECTS OF O-PHENYLENEDIAMINE ON ADSORPTION AND DESORPTION OF COPPER IONS IN RE D SOIL AND SAJONG BLACK SOIL

研究了铜在红壤和砂姜黑土中的吸附和解吸过程以及有机污染物邻苯二胺对铜在两种土壤中吸附和解吸行为的影响。结果表明 ,砂姜黑土较红壤对铜具有更高的吸附量 ,同时 ,被吸附的铜离子从土壤中的脱附百分数也是砂姜黑土大于红壤 ,吸附在砂姜黑土中的铜较红壤更易被 1molL- 1 MgCl2 所置换。pH 3 .5～ 7.5范围内 ,土壤对铜的吸附量均随溶液pH的升高而升高 ,呈现S形。邻苯二胺增加了红壤对铜的吸附量 ,同时也增加了铜的脱附百分数。而邻苯二胺虽未改变砂姜黑土对铜的吸附量 ,但却显著改变了铜的脱附百分数。

Study of Cu adsorption and desorption processes on Red soil (R) and Sajong b lack soil (SB) is carried out. The results exhibit that SB has higher Cu adsorpt ion quantity than R,and Cu desorption percentage from SB is also higher than th at from R. It means that Cu is more easily exchanged by MgCl 2 from IB than fro m R. In the pH range from 3.5 to 7.5,Cu adsorption in the two soils increases wit h increasing pH,and shows as of S-shape. Effect of o-Phenylenediamine (o-PD) on Cu adsorption and desorption in the two soils shows that presence of o-PD incr e ases Cu adsorption in R but not changes it obviously in SB,meanwhile,Cu desorp tion percentage increased correspondingly. Although o-PD does not change Cu ads o rption quantity in SB,it changes Cu adsorption process strongly,which can be r ecognized from Cu desorption percentage from SB.