机构地区: 河南师范大学化学与环境科学学院河南省环境污染控制重点实验室
出 处: 《化学学报》 2006年第11期1169-1172,共4页
摘 要: 建立了一种利用修饰有结晶紫(CV+)的微晶酚酞作为固态吸附剂分离富集溶液中痕量Zn(II)的新方法,富集后的Zn(II)含量可直接用光度法测定.控制一定条件,Zn(II)能与常见阳离子Ni(II),Cd(II),Al(III),Ca(II),Mg(II),Co(II),Mn(II),Cu(II),Pb(II),Fe(III)等完全分离,且富集时基本不受SO24-,NO-3,Br-,Cl-,I-,ClO-4等阴离子影响.微晶酚酞对Zn(II)的吸附容量为25.8mg/g;富集因数可达200倍,回收率在97.7%~102%之间,RSD小于2.7%.该方法已成功应用于实际水样中Zn(II)的富集测定,结果令人满意. A new method for trace Zn(Ⅱ) preconcentration and separation was described using microcrys- talline phenolphthalein modified by crystal violet as an adsorbent coupled with the determination by spectrophotometry. Under certain conditions Zn(Ⅱ) was completely separatable from Ni(Ⅱ), Cd(Ⅱ), Al(Ⅲ), Ca(Ⅱ), Mg(Ⅱ), Co(Ⅱ), Mn(Ⅱ), Pb(Ⅱ), Cu(Ⅱ), Fe(Ⅲ) and hardly affected by SO4^2-, NO3^-, Br^-, Cl^-, I^-, ClO4^-. The adsorption capacity of microcrystalline phenolphthalein was found to be 25.8 mg/g for Zn(Ⅱ). The preconcentration factor can reach 200, and the recovery of Zn(Ⅱ) is in a range of 97.7%- 102%. The reladve standard deviation (RSD) is not beyond 2.7%. The proposed method has been applied to the preconcentration and determination of trace Zn(Ⅱ) in water samples with satisfactory results.