固相萃取 -火焰原子吸收光谱法分析水溶肥料铬形态
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(中国农业科学院农业资源与农业区划研究所,北京 100081)

作者简介:

韩岩松(1978-),男,北京人,大学本科,主要从事肥料和土壤调理剂方法研究及评价工作。E-mail:hyssfac@163.com。

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基金项目:国家重点研发计划(2016YFF0201801)。


Speciation analysis of water-soluble fertilizer chromium by ion exchange separation and flame atomic absorption spectrometry
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(Insitute of AgriculturalResources and RegionalPlanning,Chinese Academy of AgriculturalSciences,Beijing100081)

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    摘要:

    研究了采用阴离子交换柱吸附 Cr 6+,使之与 Cr 3+分离,火焰原子吸收光谱法测定水溶肥料中水溶态 Cr3+及总铬含量,差减法测得 Cr 6+含量。分析了仪器工作条件、试液上柱流速等对实验结果的影响。结果表明,在最优实验条件下,水溶态总铬测定值的相对标准偏差(RSD)为 1.12%~ 3.13%,水溶态 Cr 3+测定值的 RSD为 1.93%~2.93%;Cr 3+的加标回收率为 98.8%~104.0%,Cr 6+吸附率为 97.0%~102.0%,固相萃取 -火焰原子吸收光谱法可用于水溶肥料中铬形态的检测,且具有成本相对较低、操作简便、重现性好等优点。

    Abstract:

    The adsorption of Cr6+ on Cr3+was carried out by anion exchangecolumn.The contents of Cr 3+ and total chromium in water-soluble fertilizer were determined by flame atomic absorption spectrometry.The content of Cr 6+ was determined bysubtractionmethod.The effects of the working conditions of the instrument and the flow rate of the test solution through thecolumn on the experimental results were analyzed.The results show that under the optimal experimental conditions,therelative standarddeviation(RSD)of water -soluble total chromium measured value is 1.12%~3.13%,and the RSD of water-soluble Cr3+ measured value is 1.93%~2.93%;the recoveries of Cr 3+are between 98.8% and104.0%,and the adsorption rate of Cr6+is between 97.0% and102.0%.Solid Phase Extraction -Flame Atomic Absorption Spectrometry can be applied to the speciation analysis of chromium in water-soluble fertilizers,and has the advantages of relatively lowcost,easy operation and good reproducibility.

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韩岩松,黄均明,保万魁,刘红芳,刘蜜,王旭.固相萃取 -火焰原子吸收光谱法分析水溶肥料铬形态[J].中国土壤与肥料,2020,(6):308-314.

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  • 收稿日期:2019-09-18
  • 最后修改日期:
  • 录用日期:2019-12-27
  • 在线发布日期: 2021-01-21