地质样品中硫化物形式铁的分离和测定  

SEPARATION AND DETERMINATION OF SULFIDES COMBINED WITH IRON IN THE GEOLOGICAL SAMPLES

作　　者：周佳琦[1] 胡超涌[1] 马仲武[1] 谢树成[1] 

机构地区：[1]中国地质大学(武汉)生物地质与环境地质教育部重点实验室,武汉430074

出　　处：《海洋地质与第四纪地质》2010年第2期143-146,共4页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金重点项目(40531004);中国石油化工股份有限公司海相油气勘探前瞻性项目(G0800-06-2S-319)

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40h以上,可以完全释放铁硫化物并形成氢氧化铁胶体。0.1g/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。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.

关 键 词：铁硫化物 次氯酸钠 磺基水杨酸 分光光度法 

分 类 号：P736.21[天文地球—海洋地质]