在NaNO_3存在下浮选CuSCN间接测定抗坏血酸  

Indirect determination of ascorbic acid with sodium nitrate by floatation separation of CuSCN

作　　者：王春风[1] 孙东[2] 

机构地区：[1]河南师范大学生命科学学院,新乡453007 [2]河南师范大学化学与环境科学学院,新乡453007

出　　处：《分析试验室》2008年第3期45-47,共3页Chinese Journal of Analysis Laboratory

基　　金：河南省创忻人才工程(教高[2001]513号)项目资助

摘　　要：建立了浮选CuSCN间接测定抗坏血酸（Vc）的方法。研究表明,在NaNO3存在下,Cu（Ⅱ）被抗坏血酸还原生成的Cu（Ⅰ）与SCN^-形成CuSCN沉淀而被浮选。结果表明,Vc量在2.64-15.8 mg/L范围内与CuSCN的浮选率呈良好的线性关系,回归方程为：E/%=6.008ρ-3.673,r=0.9962。此方法可用于水果和药片中Vc量测定。A new method for indirect determination of ascorbic acid（Vc） by floatation and separation of CuSCN has been studied in this paper. The study shows that Cu（ Ⅱ ） can be reduced to Cu（ Ⅰ ） by Vc and Cu（ Ⅰ） reacts with the SCN- to form CuSCN, which can be floated on the surface of the liquid phase with NaNO3. A good linear relationship is observed between the floatation efficiency （E/% ） of CuSCN and the amount of Vc, and a linear range is 2.64 - 15.8 mg/L. The linear equation is E（% ） = 6.008c - 3.673 with r = 0.9962. The method is simple, rapid, reliable and nontoxic. The developed method can be applied to indirect determination of Vc in tablets and fruits with satisfactory results.

关 键 词：抗坏血酸 NH4SCN NaNO3 浮选 

分 类 号：O657.3[理学—分析化学]