华东师范大学学报（自然科学版） ›› 2025, Vol. 2025 ›› Issue (2): 154-162.doi: 10.3969/j.issn.1000-5641.2025.02.015

• 环境监测技术与评价分析 • 上一篇    

3种预处理方式下水体悬浮颗粒物碳、氮含量的测试误差分析

崔莹(), 张国森, 张丹   

  1. 华东师范大学 河口海岸全国重点实验室, 上海　200241
  • 收稿日期:2023-07-06 接受日期:2023-12-06 出版日期:2025-03-25 发布日期:2025-03-27
  • 作者简介:崔　莹, 女, 高级工程师, 研究方向为有机元素分析. E-mail: ycui@sklec.ecnu.edu.cn
  • 基金资助:
    国家自然科学基金 (41706128)

Evaluation of the measurement error of suspended particulate carbon and nitrogen content in water pretreated using three different methods

Ying CUI(), Guosen ZHANG, Dan ZHANG   

  1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University,Shanghai　200241, China
  • Received:2023-07-06 Accepted:2023-12-06 Online:2025-03-25 Published:2025-03-27

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摘要：

定量分析了当采用全膜、切割和刮取这3种预处理方式时, 元素分析仪测定水体悬浮颗粒物碳、氮含量的测试误差, 分析了影响误差大小的因素, 并提出了优化方案. 结果表明, 全膜进样的样品测试误差最低, 其次是切膜预处理的样品, 刮膜预处理的样品测试误差最高. 碳含量的测试误差低于氮含量的, 且与膜上颗粒物的碳含量呈显著负相关 (r = –0.545, p = 0.000). 当膜上颗粒物的碳含量达到0.5 mg以上时, 测试误差在10%以内, 达到1 mg时, 测试误差可在5%以内. 综合分析, 在悬浮颗粒物样品预处理环节中, 膜上颗粒物的质量、颗粒物在膜上分布的均匀程度以及颗粒物在玻璃纤维膜孔隙中的残留量是悬浮颗粒物样品碳含量测定的三大影响因素, 而氮含量的测定影响因素更为复杂, 且在处理过程中易受污染. 最终, 优选出测试误差相对较低的样品收集、预处理和测试方案, 即用直径25 mm的玻璃纤维膜 (Glass Fiber Filter, GF/F) 收集样品, 全部包样上机测试, 且保证膜上颗粒物的碳含量在0.5 mg以上.

关键词: 悬浮颗粒物, 预处理, 碳含量, 氮含量, 元素分析仪, 测试误差

Abstract:

The measurement errors of particulate carbon and nitrogen in water using three pretreatments were evaluated quantitatively, and impact factors were discussed. Next, an optimized sample collection, pretreatment, and measurement method was suggested. The results showed that the measurement errors of samples analyzed on whole filters were the lowest, and those of samples pretreated by scraping were the highest. The measurement errors of carbon were lower than those of nitrogen and were negatively related to the carbon content on the filter (r = –0.545, p = 0.000). When the carbon content on the filter was > 0.5 mg, the measurement error of the carbon was < 10%. When the carbon content on the filter reached 1 mg, the measurement error could be < 5%. In conclusion, the predominant factors influencing the measurement error were the carbon content, uniformity of the particulate, and sample residue on the filter. The results suggested that more complicated factors influenced the measurement of nitrogen content. An optimized method for the sample collection, pretreatment, and measurement was recommended, namely, a smaller glass microfiber filter (GF/F: diameter 25 mm) should be used to collect the samples, the whole filter should be analyzed without cutting and scraping pretreatment, and the carbon content of the particulate matter on the filter should be > 0.5 mg.

Key words: suspended particulate matter, pretreatment, carbon content, nitrogen content, element analyzer, measurement error

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