DIN 52241-6-1986 制造玻璃原料的分析.对含碳酸钙镁不小于95%的白云石的化学分析.氧化钛(Ⅳ)的测定
Analysis of raw materials used in glass production; chemical analysis of dolomite containing not less than 95 % of calcium magnesium carbonate; determination of titanium(IV)oxide
The standard specifies a photometric determination of TiO2 as a complex with 3,5-pyrocatecholdisulfonic acid disodium salt (Tiron) at pH 4,0 and a wave length of 400 nm.