摘要
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.
出处
《土壤学报》
CAS
CSCD
北大核心
1998年第4期468-474,共7页
Acta Pedologica Sinica
基金
第Ⅶ报和第Ⅷ报均为国家自然科学基金!39300077
3470411
浙江省自然科学基金!491017
关键词
硫酸钠
腐殖质
土壤有机质
Sodium sulphate, Humus, Ca-bound organo-mineral complexes