NF B49-435-1-2009
含铬耐火材料产品和含铬原材料的化学分析(可选择X射线荧光法).第1部分:重量分析硅石的装置、试剂、液化和测定
Chemical analysis of chrome-bearing refractory products and chrome-bearing raw materials (alternative to the X-ray fluorescence method) - Part 1 : apparatus, reagents, dissolution and determination of gravimetric silica.