SEPARATION AND DETERMINATION OF SULFIDES COMBINED WITH IRON IN THE GEOLOGICAL SAMPLES
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摘要: 提出一个利用次氯酸钠氧化铁硫化物碱性磺基水杨酸提取并直接测定碳酸盐相中铁硫化物的方法。结果表明,30%的NaClO溶液浸泡样品40 h以上,可以完全释放铁硫化物并形成氢氧化铁胶体。0.1 g/mL的碱性磺基水杨酸溶液则较容易地溶解新生成的氢氧化铁胶体,形成黄色的铁-磺基水杨酸络合物,可被分光光度法定量测定。该方法集选择性分离、富集和测定于一体,分析流程简单,结果可靠,适合地质样品中硫化物形式铁的测定。Abstract: A method was proposed for the determination of trace iron released from sulfides in geological samples. Iron was extracted and spectrophotometry measured by sulphosalicylic acid after sulfides were oxidized by sodium hypochlorite. The results show that 30% of sodium hypochlorite soaking the sample for more than 40 hours could transform iron sulfides completely into colloidal ferric hydroxide, which can be easily extracted by the sulphosalicylic acid solution. We integrate the selective sepatation,enrichment and determination of iron in the procedure to make the method simple and suitable for determination of iron sulfides in geological samples.
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Key words:
- iron sulfides /
- sodium hypochlorite /
- sulphosalicylic acid /
- spectrophotometer
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