研究论文
王晓钧,守屋政彦,冈田能彦,杨南如.用电子自旋探针研究水泥固化土壤中镉离子的反应[J].环境科学学报,2000,20(5):528-532
用电子自旋探针研究水泥固化土壤中镉离子的反应
- Studies on reactions of Cd2+ in soil fixed by cement using electron spin probe
- 王晓钧
- 南京化工大学材料科学与工程学院, 南京210009
- 杨南如
- 南京化工大学材料科学与工程学院, 南京210009
- 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.
- Abstract:The chemical reactions of Cd2+ in soil fixed by cement were brought out by the of electron spin probe (esp)-Mn2+ ion's hyperfine structure (hfs).The research showed that Cd2+ 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 CO2 Cd2+ ion reacts with CO2 and OH-form CdCO3 and Cd(OH)2.These reactions are detected by the change of Mn2+ hfs in ESR spectra.Ironion is not suitable for electron spin probe research, because there are no hfs in ESR spectra sach as Mn2+.
摘要点击次数: 1788 全文下载次数: 2304