| Popis: |
Spectrophotometric determination of tungsten with thiocyanate was described. Tungsten(VI) was reduced with tin(II) chloride in hydrochloric acid solution, complexed with thiocyanate ions, and the complex formed was extracted with 1-phenyl-2-methyl-3-hydroxy-4-pyridone (HX) in chloroform. The extracted complex had the ratio W:SCN:HX 1:3:2. The method described is sensitive, selective, and reproducible. The color of the tungsten-thiocyanate complex in the organic phase is stable. Few metals interfere; the separation of the interfering elements was discussed. |
