工业用硫磺 在850～900℃时灰分的测定和在200℃时残渣的测定

[中文适用范围]： 适用于含有至少 98%元素硫的产品，以质量百分比表示，产品在 80 ℃下干燥 2 小时。 灰分和残渣之间的差异对应于200℃时的“非挥发性沥青物质”含量。 灰化的原理在于干燥产品的测试部分在空气中缓慢燃烧。 在炉中加热，控制在850～900℃，称重。 非挥发性物质的测定是通过在控制在(200±10)的炉中、在氮气流中缓慢蒸发挥发性物质和硫来进行的。 约10小时后称量残留物。 [外文原描述]： Application to products containing at least 98 % of elemental sulphur, expressed as a percentage by mass, of the product dried at 80 °C for 2 h. The difference between the ash and the residue corresponds to the "non-volatile bituminous matter" content at 200 °C. The principle of ashing consists in slow combustion in air of a test portion of the dried product. Heating in a furnace, controlled at 850 °C to 900 °C, and weighing. The determination of non-volatile matter is carried out by slow evaporation in a furnace, controlled at (200 10) °C, in a flow of nitrogen, of the volatile matter and the sulphur. Weighing of the residue after about 10 h.