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测定氨水中硫化物的分析方法
Analysis method for the determination of sulfides in ammonia water
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- DOI:
- 作者:
- 牛小娟，蔡 勇，李 莉，王 成
Niu Xiaojuan，Cai Yong，Li Li，Wang Cheng
- 作者单位:
- 中国石油乌鲁木齐石化公司，新疆 乌鲁木齐 830019
Petrochina Urumchi Petrochemical Company，Urumchi 830019，China
- 关键词:
- 氨水；硫化物；关键点；碘量法
ammonia water；sulfides ；key points；Iodometric Method
- 摘要:
- 摘要：根据碘量法的测定原理，剖析发现，影响氨水中硫化物测定准确性的核心是分析过程中S无损失，并由此明确了分析的3个关键点：样品中硫完全转化为ZnS、ZnS完全转化为H2S、生成的 H2S能立即与足量的碘反应。通过试验发现，确保硫完全转化为 H2S的关键是醋酸锌的加入量，ZnS转化为H2S可通过煮沸法简化操作，避免S损失，正确的加剂顺序、碘溶液、醋酸水溶液的加入量是确保 H2S完全反应的关键，通过各步骤的优化，最终建立了氨水中硫化物的测定方法。Abstract: According to the determination principle of Iodometric Method, this paper analyzes the core that affects the accuracy ofthe determination of sulfides in ammonia water: There was no loss of sulfides in the analysis process, and makes clear the three keypoints of analysis: the sulfides in the sample is completely converted to zinc sulfide, zinc sulfide is completely converted to hydrogensulfide, and the hydrogen sulfide can react with sufficient iodine immediately. Through the experiment, it is found that the key toensure the complete conversion of sulfides into hydrogen sulfide is the addition of zinc acetate, which can be simplified by boilingmethod to avoid sulfides loss, and the correct adding sequence, the addition of iodine solution and acetic acid solution are the key toensure the complete reaction of hydrogen sulfide. Through the optimization of each step, the determination method of sulfur inammonia was finally established.