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发明公开
CN102116769A 石膏及其制品中单质硫含量的测定方法 无效 - 撤回

石膏及其制品中单质硫含量的测定方法
摘要：
本发明涉及石膏及其制品中单质硫含量的测定方法，包括如下次序的步骤：（1）称取一定质量的石膏或者石膏制品的样品；（2）处理好高纯铜片；（3）将高纯铜片约0.5g、丙酮140mL加入抽提烧瓶中；（4）调节加热温度，使抽提烧瓶中的丙酮保持微沸状态，并且使蒸馏出的丙酮在索氏抽提器中的回流次数控制为10-20次每小时；（5）抽提时间2-3小时；（6）获得经过化学反应的高纯铜片；（7）测定反应后的高纯铜片中硫含量；（8）计算石膏样品中单质硫含量；本发明实用性强、重复性好、操作安全方便、减少环境污染，具有推广价值。
摘要（英）：

The invention relates to a method for measuring elemental sulfur content in gypsum and a product thereof. The method comprises the following steps of: (1) weighing a certain amount of a sample of gypsum or a gypsum product; (2) treating a high-purity copper sheet; (3) adding 0.5g of high-purity copper sheet and 140mL of acetone into an extraction flask; (4) adjusting heating temperature to keep the acetone in the extraction flask in a slight boiling state, and controlling reflow frequency of the distilled acetone in a soxhlet extractor to be between 10 and 20 per hour; (5) extracting for 2 to 3 hours; (6) obtaining the high-purity copper sheet which is subjected to chemical reaction; (7) measuring sulfur content in the reacted high-purity copper sheet; and (8) calculating the elemental sulfur content in the gypsum sample. The method has the advantages of high practicability, high repeatability and reduced environmental pollution, can be safely and conveniently operated and has popularization value.

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