【摘要】 以我国中南地区黄棕壤和黄褐土的胶膜所对应的基质土壤为研究对象,用不同浓度的柠檬酸钠和乙酸钠溶液对土壤进行不同时间的培养试验,探讨1.4nm过渡矿物-蛭石之间的转化特点。结果表明:基质土样中的部分1.4nm过渡矿物已逐渐向蛭石转化;与其它处理相比,用0.5mol/L的柠檬酸钠和盐溶液培养基质土壤7个月后,其1.4nm过渡矿物向蛭石转化最为明显;培养前后用DCB脱铁与不脱铁的处理对样品中矿物转化的影响不显著。土壤经有机酸盐溶液培养后,其部分1.4nm过渡矿物的层间羟基铝被柠檬酸钠或乙酸钠络合出层间,随后钾、钙、镁等的水合阳离子进入,使之转化为蛭石;有机酸盐的种类、浓度和培养时间的长短,对转化的进程起着重要的作用。更多还原

【Abstract】 The transformation of 1.4 run intergrade minerals to vermiculites in yellow cinnamon soil and yellow brown earth were studied in this paper. Three matrix soils were incubated with sodium citrate and sodium acetate of different concentrations for different times, and the results indicated that some of the 1.4 run intergrade minerals were gradually transformed into vermiculites in soils. This transformation was most notable in the treatment, using 0.5 mol/L sodium citrate to incubate matrix soils for seven months, as compared with other treatments. The treatments using DCB or not to remove iron from soils before and after incubating test did not influence the transformation of 1.4 run intergrade minerals. A part of interlayer hydroxyl-aluminum in 1.4 nm intergrade minerals could be chelated out from mineral interlayers by sodium citrate or sodium acetrate, then the hydrate ions of potassium, calcium and magnesium could enter the layers, and this made 1.4 nm intergrade minerals change into vermiculites in the incubated matrix soils. The type and concentration of organic ligand and the incubating time are the important factors affecting the transformation.更多还原