分光光度法测定腈纶中微量硫氰酸根

Spectrophotometric measurement of trace thiocyanate in PAN fiber

在pH为1～1.5的硝酸酸性条件下,硫氰酸根和铁(Ⅲ)反应形成红色络合物,在体系中加入2-4mL稳定剂(Triton-100),提高了络合物的稳定性。利用分光光度法可有效测定腈纶中硫氰酸钠含量。应用表明,该方法稳定实用,其回收率在98%-104%。

The spectrophotometric measurement was used to determine trace thiocyanate in PAN fiber. Thiocyanatoes reacted with ferric ions to obtain a red complex in dilute nitric acid aqueous solution with pH value in the range of 1 -1.5. The stability of the complex can be improved by adding 2-4 mL Triton X-100 into the above system. The results showed that the method was reliable and practicable with the recovery in the range of 98% - 104% .