摘要
应用电子自旋探针 (Electronspinprobe ,简称ESP) Mn2 +离子的超精细结构 (hyperfinestructure ,简称hfs) ,揭示了水泥固化土壤中Cd2 +离子的化学反应 .研究发现 :由于水泥水化产生高的 pH值 ,Cd2 +离子与OH- 离子反应生成Cd(OH) 2 沉淀 ;当有CO2 气体存在时 ,Cd2 +离子会与CO2 和水泥水化的OH- 离子反应生成CdCO3和Cd(OH) 2 ,这些反应在ESR谱图中通过Mn2 +离子的hfs变化检测出来 .尽管土壤中含有铁离子 ,但铁离子的ESR信号宽化且没有类似于Mn2 +离子的hfs特征 ,所以铁离子不适合于作本研究的电子自旋探针 .
The chemical reactions of Cd 2+ in soil fixed by cement were brought out by the of electron spin probe (esp)\|Mn 2+ ion's hyperfine structure (hfs).The research showed that Cd 2+ ion reacts with OH\+- ion to form sediment Cd(OH)\-2 under high pH value condition which produced by cement hydration.Under the conditions of CO\-2 Cd 2+ ion reacts with CO\-2 and OH\+- form CdCO\-3 and Cd(OH)\-2.These reactions are detected by the change of Mn 2+ hfs in ESR spectra.Iron ion is not suitable for electron spin probe research,because there are no hfs in ESR spectra sach as Mn 2+ .
出处
《环境科学学报》
CAS
CSCD
北大核心
2000年第5期528-532,共5页
Acta Scientiae Circumstantiae
关键词
镉
ESR
水泥
土壤污染
固化
土壤监测
cadmium
electron spinning resonance (ESR)
electron spin probe(ESP)
cement
soil
