高等学校化学学报 ›› 2023, Vol. 44 ›› Issue (12): 20230390.doi: 10.7503/cjcu20230390

• 分析化学 • 上一篇    

基于铂修饰丝网印刷电极检测土壤中铵态氮的电化学传感器

陈珊1, 陈劲虎2, 徐郭海林3, 柳军1, 钱明艳1, 陈敬文1(), 方一民2   

  1. 1.江苏省农业科学院农业设施与装备研究所, 江苏省生物质复合材料与增材制造技术工程研究中心, 农业农村部长江中下游设施农业工程重点实验室, 南京 210014
    2.南京医科大学药学院, 南京 211166
    3.江苏大学农业工程学院, 镇江 212013
  • 收稿日期:2023-09-01 出版日期:2023-12-10 发布日期:2023-10-20
  • 通讯作者: 陈敬文 E-mail:chenjingwen@jaas.ac.cn
  • 基金资助:
    江苏省农业科技自主创新资金(批准号: CX(21)3064)资助

Electrochemical Sensor for Ammonium Nitrogen in Soil Based on Platinum Modified Screen-printed Electrodes

CHEN Shan1, CHEN Jinhu2, XU Guohailin3, LIU Jun1, Qian Mingyan1, CHEN Jingwen1(), FANG Yimin2   

  1. 1.Institute of Agricultural Facilities and Equipment,Jiangsu Academy of Agricultural Sciences,Jiangsu Engineering Technology Research Center of Biomass Composites and Addictive Manufacturing,Key Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of the Yangtze River,Ministry of Agriculture and Rural Affairs,Nanjing 210014,China
    2.School of Pharmacy,Nanjing Medical University,Nanjing 211166,China
    3.Jiangsu University,School of Agricultural Engineering,Zhenjiang 212013
  • Received:2023-09-01 Online:2023-12-10 Published:2023-10-20
  • Contact: CHEN Jingwen E-mail:chenjingwen@jaas.ac.cn
  • Supported by:
    the Jiangsu Agricultural Science and Technology Innovation Fund, China(No.CX(21)3064)

摘要:

土壤中铵态氮(NH4+)含量的现场检测对于提高氮肥的利用率、 减少环境污染, 从而实现精准农业具有重要意义. 针对目前土壤检测方法存在的周期长、 成本高及时效性差等问题, 本文基于铂粒子对NH4+具有特异性电催化响应, 通过在丝网印刷电极(SPE)表面电沉积铂颗粒, 制备了一种电化学传感器. 采用碳酸盐排除土壤中未知离子的干扰, 结合土壤铵态氮快速提取装置, 实现了对土壤中铵态氮的现场快速检测. 该传感器对NH4+检测的线性范围为0.1~5 mmol/L(R2=0.997), 检出限为13 μmol/L(S/N=3), 检测时间约5 min; 并且对土壤中NH4+具有良好的选择性和稳定性, 可应用于实际土壤样品中NH4+的快速检测. 相比于传统的检测方法, 该方法无需大型仪器、 操作便捷、 检测速度快, 可望为土壤中铵态氮的快速检测提供新方法, 为精准农业提供重要的数据支持.

关键词: 土壤, 铵态氮, 电化学, 丝网印刷电极

Abstract:

Rapid detection of ammonium nitrogen(NH4+) in soil is quit important for precise agriculture as it can significantly increase the utilization of soil fertility and reduce the environmental pollution. Compared with the traditional detection methods for NH4+ which are time-consuming and expensive, here we developed a rapid and sensitive electrochemical sensor by platinum deposited screen printed electrodes(Pt-SPEs) as sensing components. Owing to the specific catalysis to NH4+, using the carbonate to precipitate the metal ions, coupling with the ammonium extraction syringe, NH4+ in soil can be detected in 5 min for the first time, with a detection range of 0.1—5 mmol/L(R2=0.997)and a detection limit of 13 μmol/L(S/N=3). This sensors can be applied for on-site detection of NH4+ in soil due to its rapidity, simplicity, high selectivity and stability without large equipment, providing an important data support for precise agriculture.

Key words: Soil, Ammonium nitrogen, Electrochemistry, Screen printed electrode

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