食品科学

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在线双毛细管火焰原子吸收法测定海带中的微量锶

王 娟,贺攀红*,杨 珍   

  1. 河南省核工业地质局,河南省核工业放射性核素检测中心,河南 郑州 450002
  • 出版日期:2014-05-25 发布日期:2014-05-29
  • 通讯作者: 贺攀红

Determination of Trace Strontium in Kelp by Flame Atomic Absorption Spectrometry with On-Line Binary Capillary

WANG Juan, HE Pan-hong*, YANG Zhen   

  1. Henan Nuclear Industry Radioactive Nuclide Testing Centre, Henan Province Nuclear Industry Geology, Zhengzhou 450002, China
  • Online:2014-05-25 Published:2014-05-29
  • Contact: HE Pan-hong

摘要:

研究在线双毛细管快速测定海带中微量锶的方法,使用相同管径的双毛细管对酸度和干扰离子进行探讨。采用湿法溶样对样品进行前处理,通过在线加入十二烷基磺酸钠抑制干扰,采用10.0 L/min空气流量和1.2 L/min乙炔流量进行了实验,结果显示:海带中Sr含量在700 μg/g左右。方法检出限为0.1 μg/g,样品回收率在97.8%~107.4%,精密度小于5%。方法准确快速、成本低廉,适合样品中微量锶的测定。经实际样品验证获得较为满意的结果。

关键词: 在线双毛细管, 火焰原子吸收光谱法, 海带,

Abstract:

A rapid method to determine trace amounts of strontium in kelp was proposed using flame atomic absorption
spectrometry (FAAS) after sample injection by on-line binary capillary. The impact of acidity and interfering ions on
detection of strontium was explored using binary capillaries of the same diameter. Samples were digested with acids, and the
interfering ions were effectively suppressed by on-line addition of sodium dodecyl sulfate (SDS). The analysis was carried
out at a flow rate of 10.0 and 1.2 L/min for air and acetylene, respectively. Results showed that the content of strontium in
kelp was 700 μg/g, as determined by the FAAS method. The limit of detection (LOD) of the method was 0.1 μg/g, the spiked
recoveries of strontium in real samples were between 97.8% and 107.4%, and the precision expressed as relative standard
deviation (RSD) was less than 5%. This method is accurate, rapid, low-cost and suitable for determination of trace strontium
in samples with satisfactory results.

Key words: on-line binary capillary, flame atomic absorption spectrometry, kelp, strontium

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