应用氢化物发生-原子吸收分光光度法和直接测汞仪测定肥料中汞含量的方法比对研究
作者:
作者单位:

(1.上海化工院检测有限公司,上海.200062;2.上海化工研究院有限公司,上海.200062)

作者简介:

段路路(1981-),正高级工程师,博士,主要从事肥料质量检测及标准化研究。E-mail:dll@ghs.cn。

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基金项目:

基金项目:上海市2020年度“科技创新行动计划”(20DZ2203200)。


Comparative study on determination of mercury in fertilizer by hydride generation atomic absorption spectrophotometry and direct mercury analyzer
Author:
Affiliation:

(1.Shanghai Research Institute of Chemical Industry Testing Co. Ltd.,Shanghai 200062;2.Shanghai Research Institute of Chemical Industry Co. Ltd.,Shanghai 200062)

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    摘要:

    肥料中的汞元素是重要的重金属污染物之一,研究肥料中汞元素的快速测定方法对于肥料的安全生产意义重大。研究通过正交设计试验,方法检出限、精密度和准确性试验,优化了仪器条件,确定了直接测汞仪测定肥料样品中汞含量的最佳仪器条件,并与GB/T 23349-2020《肥料中砷、镉、铬、铅、汞含量的测定》中规定的氢化物发生-原子吸收分光光度法进行比对。研究结果表明,正交试验确定的直接测汞仪法的最佳分析条件组合为 “干燥温度250℃,催化分解温度700℃,开始测定温度300℃”。该方法具有良好的二次曲线关系,方法检出限为0.0023 ng,加标回收率在93.8%~103.9%之间,相对标准偏差在3.2%~6.3%之间。通过与国家标准对比表明,直接测汞仪法与氢化物发生-原子吸收分光光度法无显著性差异,该法具备简便、快速、准确、灵敏度高等特点,适合不同肥料品种中汞元素的测定。

    Abstract:

    Mercury in fertilizer is one of the most important heavy metal pollutants. The research on the rapid determination method of mercury in fertilizer is of great significance for the safe production of fertilizer.In this study,through orthogonal design test,method detection limit,precision and accuracy test,the instrument conditions were optimized,and the best analytical conditions for the determination of mercury content in fertilizer samples by direct mercury analyzer were determined,which were compared with the hydride generation atomic absorption spectrophotometry specified in GB/T 23349-2020 determination of arsenic,cadmium,chromium,lead and mercury contents for fertilizers.The results show that the best combination of analytical conditions for direct mercury determination method determined by orthogonal test is “drying temperature 250 ℃,catalytic decomposition temperature 700 ℃,and starting determination temperature 300 ℃”.The method has a good quadratic curve relationship.The detection limit is 0.0023 ng,the recovery is 93.8%~103.9%,and the relative standard deviation is 3.2%~6.3%.The comparison with the national standard shows that there is no significant difference between the direct mercury meter method and the hydride generation atomic absorption spectrophotometry.The method is simple,rapid,accurate and sensitive.It is suitable for the determination of mercury in different fertilizer varieties.

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段路路,马欣萍,殷炯.应用氢化物发生-原子吸收分光光度法和直接测汞仪测定肥料中汞含量的方法比对研究[J].中国土壤与肥料,2023,(2):245-250.

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  • 收稿日期:2022-01-20
  • 最后修改日期:
  • 录用日期:2022-03-18
  • 在线发布日期: 2023-05-16
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