红壤对SO_4~（2－）和H_2PO_4~－的吸附与竞争吸附研究

• 作 者: 陈铭 刘更另 孙富臣
• 机 构: 中国科学院自然资源综合考察委员会，国家计委自然资源综合考察委员会,中国农业科学院
• 出 处: 热带亚热带土壤科学
• 发表日期: 1996年02期
• 关键词: H_2PO_4 SO_4 红壤丘陵 阴离子排斥 竞争吸附 专性吸附 吸持 吸附机理 吸附量 刘更另

研究红壤对ＳＯ４（２－）和Ｈ_２ＰＯ(４－)的吸附与竞争吸附机理．实验结果表明，红壤吸附Ｈ２ＰＯ４－的量远远大于ＳＯ４（２－），前者几乎是后者的２倍．在两种阴离子共存体系中，Ｈ２ＰＯ４－使ＳＯ４（２－）吸附量明显减少，在浓度低时甚至出现负吸附；ＳＯ４（２－）对Ｈ２ＰＯ４－吸附量的影响很小．说明土壤对Ｈ２ＰＯ４－的吸持力较强，为高强度专性吸附，不易于被其它阴离子解吸；土壤对ＳＯ４（２－）的吸持力则较弱，为低强度专性吸附或非专性物理吸附，能够被吸持力更强的阴离子完全解吸．

The adsorption and competition mechanism of SO2 (2-) and H2PO (4-) in red soil were studied. The experimental results show that the amount of adsorbed H2PO4- in red soil is much larger than that of SO4 (2-), the former is almost twice as much as the latter. In the two anion coexistence systems, H2PO4- significantly reduced SO4 (2-) adsorption and negative adsorption even at low concentrations; SO4 (2-) had little effect on H2PO4- adsorption. It shows that the soil has stronger H2PO4- adsorption capacity, which is a high-intensity adsorption, which is not easy to be desorbed by other anions. The SO2 (2-) Sexual physical adsorption, can be more strongly absorbed anion desorption.