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用艾氏劑法測定煤中全硫時應該注意的小問題

发布时间：2014-06-18 点击次数：1549次

用艾氏劑法測定煤中全硫時，應注意以下幾個問題：

（1）必須在通風下進行半熔，否則煤粒燃燒不完全而使部分硫不能轉化爲二氧化硫；

（2）沈澱劑BaCl2必須過量；

（3）在用水抽提、洗滌時，要求溶液體積不宜過大，以免影響測定結果；

（4）注意調節溶液酸度，使CO32-轉爲CO2逸出；

（5）在洗滌過程中，每次吸入蒸餾水前，應將洗液都濾幹，這樣洗滌效果好；

（6）在灼燒前不得殘留濾紙，高溫爐也應通風；

（7）灼燒後的BaSO4在幹燥器中冷卻後，及時稱量；

（8）必須做空白試驗。

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