土壤有机矿质复合体研究Ⅷ.分离钙键有机矿质复合体的浸提剂─—硫酸钠

STUDIES ON ORGANO-MINERAL COMPLEXES IN SOIL Ⅷ. SODIUM SULPHATE AS EXTRACTANT TO SEPARATE CALCIUM-BOUND ORGANO-MINERAL COMPLEXES IN SOIL

土壤中通过钙键结合的有机矿质复合体是一种外圈配合物。硫酸钠中的SO作为金属离子的配位体可以与复合体中的Ca2+形成配合物，破坏钙键复合体，并使腐殖质转变为腐殖酸钠盐，从而与铁铝键复合体分离。本文论证了硫酸钠破坏钙键复合体和浸提腐殖质的能力，证明硫酸钠是区分钙键复合体和铁铝锭复合体的优良试剂；研究了用硫酸钠液分离钙键复合体的方法，并提出连续浸提铁铝键复合体的后续浸提剂种类。

Calcium-bound organo-mineral complexes in soil belong to a kind of outer sphere complexes. SO in sodium sulphate, as a coordination agent, can destroy Ca-abound organomineral complexes by coordinating Ca2+ and extract Ca-bound humus. This work examined the ability of sodium sulphate to destroy Ca-bound organo-mineral complexes and to extract humus from soils and synthetic organo-mineral complexes It was proved that sodium sulphate was a suitable agent to differentiate Ca-bound complexes from Fe/ Al bound complexes in soils. A detailed method for separating Ca-bound complexes by sodium sulphate is described. Finally, a follow-up extractant to sequentially extract Fe/ Al-bound complexes from soils is also proposed.