摘要
用电感耦合等离子体原子发射光谱法及分光光度法测定了镀锌钢板表面铬酸盐转化膜中铬(Ⅵ)量。试验中发现硫酸锌的存在严重影响铬(Ⅵ)的测定结果,铬(Ⅵ)的测定值与硫酸锌的共存量成反比关系。根据试验结果,在Yt/s值与硫酸锌存在量之间保持线性关系,如所导出的线性回归方程为Yt/s=98.80988-0.23342X,其中Yt/s为所测得的铬(Ⅵ)量与相应的ZnSO4(以Zn2+计)标准溶液加入量之间的比值。经试验证明:借加入碳酸钠将锌(Ⅱ)沉淀除去,可完全消除硫酸锌对铬(Ⅵ)的测定干扰。
Contents of Cr（Ⅳ） in the chromate conversion film on the surface of galvanized steel sheets were determined by ICP-AES and spectrophotometry. It was found that the presence of zinc sulfate showed significant effect on the values of content of chromium determined, which were inversely proportional to the amounts of zinc sulfate present. It was found that linear relationship between the values of Ye, and X （the amounts of zinc sulfate present） was found as shown by the linear regression equation： Yt/s=98. 809 88=0. 233 42 X where Yt/s are the ratio of values of Cr（VI） found to be the respective values of standard ZnSO4 （count with Zn2＋） solution added. As proved by experimental tests, the interference of ZnSO4 on the determination of Cr（Ⅳ ） was effectively eliminated by removing the Zn2＋ ion by precipitation with sodium carbonate.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2009年第3期352-354,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
