摘要
本文用乳光法测定了不同PH条件下,Co(No_3)_2、Ni(No_3)_2、Pb(No_3)_2、Zn(No_3)_2和Cd(No_3)_2对新生态的负电性AgBr溶胶的临界聚沉浓度(C.C.C)和临界稳定浓度(C.S.C)。然后用C.C.C来确定金属离子及其水解产物的电荷;用C.S.C线的斜率值来确定水解产物中的金属离子与羟基的比值(M:OH值)。结果发现此斜率值只能给出电荷为4的水解产物的M:OH值,不能给出电荷为3的水解产物的M:OH值,对其原因也进行了分析。由此得到了在不加任何外来电解质时,Co^(2+)、Ni^(2+)和Pb^(2+)的水解产物分别是Co4(OH)_4^(4+)、Ni_4(OH)_4^(4+)和Pb_6(OH)_8^(4+);而对于Zn^(2+)和Cd^(2+)的水解,要把本文的方法与其它方法相结合才能得到其水解产物为Zn_2(OH)^(3+)和Cd_2(OH)^(3+)。
Critical Coagulation Concentrations (C. C. C) and Critical Stabilization Concentrations (C. S. C) of Co(No_3)_2、Ni(No_3)_2、Pb(No_3)_2、Zn(No_3)_2 and Cd(No_3)_2 solution for negatively charged AgBr sols in statu nascendi are determined at various PH by Light-scattering intensity. The C. C. C has been used to determine the charge of the metal ions and their hydrolyzed products in aqueous solution, the slope of the C. S. C curve has been used to determine the ratio of metal to hydroxyl(M:OH) for four-valent hydrolyzed species from Co^(2+), Ni^(2+) and Pb^(2+). The slope can not be used ,however,for trivalent hydrolyzed species form Zn2+ and Cd2+.The reasonhas been discussed. The hydrolyzed products Co4(OH)^+, Ni(OH)^+and Pb6(OH)g+respeetly formCo2+, Ni2+ and Pb2+,when the neutral salt is not added, are obtained by coagulation-stabization.But the hydrolyzed products Zn2(OH)3+ and Cd2(OH)3+ from Zn2+ and Cd2+ are obtained by thecoagulation combined with other methods.
出处
《云南师范大学学报（自然科学版）》
1992年第3期78-84,共7页
Journal of Yunnan Normal University:Natural Sciences Edition
关键词
二价
金属离子
水解
聚沉
稳定
Hydrolysis Two-valent metalion Coagulation Stabilization.
