工业水处理 ›› 2025, Vol. 45 ›› Issue (6): 80-87. doi: 10.19965/j.cnki.iwt.2025-0145

• 石油石化行业废水处理专题 • 上一篇    下一篇

氨气敏电极法测定石化废水中氨氮的优化研究

王儒珍(), 殷旭东(), 李德豪(), 陈炯, 陈伟銮, 吴淑仪, 谢文玉, 毛玉凤   

  1. 广东石油化工学院环境科学与工程学院,广东 茂名 525000
  • 收稿日期:2025-04-12 出版日期:2025-06-20 发布日期:2025-06-19
  • 通讯作者: 殷旭东, 李德豪
  • 作者简介:

    王儒珍(1987— ),硕士,实验师,E-mail:

  • 基金资助:
    茂名市科技计划项目(2023384); 广东石油化工学院校级科研项目(博士启动类)(2023bsqd2002)

Optimization of ammonia gas sensitive electrode method for determination of ammonia-nitrogen in petrochemical wastewater

Ruzhen WANG(), Xudong YIN(), Dehao LI(), Jiong CHEN, Weiluan CHEN, Shuyi WU, Wenyu XIE, Yufeng MAO   

  1. School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China
  • Received:2025-04-12 Online:2025-06-20 Published:2025-06-19
  • Contact: Xudong YIN, Dehao LI

摘要:

为提高氨气敏电极法测定石化废水中氨氮的准确性和适用性,促进其在实际生产中的广泛应用,对石化废水中氨氮测定所需的离子强度调节剂进行系统优化。通过实验筛选,确定最佳离子强度调节剂由2.50 mol/L氢氧化钠、0.25 mol/L酒石酸钾钠和0.05 mol/L EDTA-2Na组成。优化后的氨气敏电极法具有较低的检出限(0.03 mg/L),样品加标回收率在95%~105%之间,在精密度和准确度上都有较好的表现。此外,该方法在1.00~40.00 mg/L的氨氮质量浓度范围内表现出优异的稳定性,能够满足石化废水中氨氮测定的实际需求。为验证优化后方法的可靠性,将其应用于某石化企业废水中氨氮的测定,并将结果与采用蒸馏-中和滴定法的结果进行对比。结果显示,两种方法的测定结果具有高度一致性,其相对差异百分比均小于5%,说明在石化废水氨氮的实际测定中,经优化的氨气敏电极法准确度高,适用性强。

关键词: 氨氮, 氨气敏电极法, 石化废水, 离子强度调节剂

Abstract:

To improve the accuracy and applicability of the ammonia gas-sensitive electrode method for determining ammonia-nitrogen in petrochemical wastewater and to promote its extensive application in practical production, this study systematically optimized the ionic strength adjuster required for determination of ammonia-nitrogen in petrochemical wastewater. The experimental screening results showed that the optimal formulation of the ionic strength adjuster was determined, consisting of 2.50 mol/L sodium hydroxide, 0.25 mol/L potassium sodium tartrate, and 0.05 mol/L EDTA-2Na. The optimized ammonia gas-sensitive electrode method demonstrated a low detection limit(0.03 mg/L), with a spike recovery rate ranging from 95% to 105%, indicating good precision and accuracy. In addition, the method showed excellent stability in the concentration range of ammonia-nitrogen of 1.00-40.00 mg/L and could meet the actual needs of ammonia-nitrogen determination in petrochemical wastewater. To verify the reliability of the optimized method, it was applied to determine the ammonia-nitrogen content in wastewater from a petrochemical enterprise, and the results were compared with those obtained by the distillation-neutralization titration method. The analytical results of the two methods demonstrated excellent agreement with relative percentage differences consistently below 5%, indicating that the optimized ammonia gas-sensitive electrode method had high accuracy and applicability in practical applications.

Key words: ammonia-nitrogen, ammonia gas-sensitive electrode method, petrochemical wastewater, ionic strength adjuster

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