排序方式: 共有9条查询结果,搜索用时 15 毫秒
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天然产品峰龄胶囊采用湿法[HNO3 HClO4(9 4)]消化,HGAFS分析其微量硒的含量,其线性范围为0.00~0.25mg/L,检出限为8.64×10-4mg/L,RSD<4%,回收率在98.2%~99.6%. 相似文献
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建立了一种连续测定As、Sb、Bi、Hg四元素的方法。对测汞用还原剂及几种测量体系进行了比较,采用对原子化器适当加温的无火焰原子荧光法测汞,以KMnO4消除Te、Se对汞测定的干扰。本方法As、Sb、Bi、Hg四元素的检出限分别为2.01×10-10g/ml、1.56×10-10g/ml、2.98×10-10g/ml;4.2×10-11g/ml;对GSSI平行测定11次,Hg的标准偏差为2.1%;对含As、Sb、Bi为10×10-9g/ml、1.0×10-9g/ml、10×10-10g/ml的溶液平行测定11次,其RSD分别为1.375%、1.386%和2.339%;经对地球化学标准物质及批量样品分析证明,结果满足要求。 相似文献
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J. Mi J. Ren H.-J. Zhang W.-R. Bao K.-C. Xie 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2013,35(5):411-419
Abstract Two complementary methods, float-sink experiment and sequential chemical leaching were used to probe into the occurrence of arsenic in two Chinese coals: Yima (YM) and Datong (DT). Flow injection-hydride generation atomic fluorescence spectrometry was employed to measure the arsenic content in parent coals as well as the size and density-fraction samples. Float-sink experiment indicated that the heavy density fractions were enriched mineral containing arsenic in two bituminous coals studied, as confirmed by the sequential chemical leaching method. Sequential chemical leaching revealed that sulfide arsenic was the primary mode of occurrence (> 50%), stable form also abounded in coal with content between 30 and 40%, and a small amount of arsenic took the occurrence of organic form. 相似文献
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研究了氢化物发生一原子荧光光谱法(HGAFS)测定电解二氧锰中微量硒,对仪器的条件、酸度的影响、还原剂的用量进行了优化设计。方法的相对标准偏差为1.6%~2.9%,检出限(3d)为0.204μg/L,线性范围为0~50μg/L,相关系数为0.9998,回收率为94.8%~101.6%。此方法的选择性好,灵敏度较高,获得的结果令人满意。 相似文献
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