杜尚丰,曹淑姝,潘奇,朱颖,冯磊.电极法测定土壤硝态氮精度的提高方法[J].农业机械学报,2016,47(1):118-125.
Du Shangfeng,Cao Shushu,Pan Qi,Zhu Ying,Feng Lei.Improvement of Detection Accuracy of Soil Nitrate-nitrogen Based on Ion Selective Electrode[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(1):118-125.
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电极法测定土壤硝态氮精度的提高方法   [下载全文]
Improvement of Detection Accuracy of Soil Nitrate-nitrogen Based on Ion Selective Electrode   [Download Pdf][in English]
投稿时间:2015-07-31  
DOI:10.6041/j.issn.1000-1298.2016.01.016
中文关键词:  土壤硝态氮  离子选择性电极  检测精度
基金项目:国家自然科学基金项目(61134011)
作者单位
杜尚丰 中国农业大学 
曹淑姝 中国农业大学 
潘奇 中国农业大学 
朱颖 中国农业大学 
冯磊 中国农业大学 
中文摘要:离子选择性电极为土壤硝态氮含量分析提供了一种快速、低成本的技术方案。以提高基于电极法的土壤硝态氮检测精度为目的,探讨了电极信号特点与环境因素对检测精度的影响;从硬件电路和软件测量模型两方面研究减少误差、提高精度的方法;进行了有、无阻抗变换-滤波模块电极电势信号采集的对比实验,并通过软件编程将不同测量模型(线性回归模型与温度校正模型)嵌入到检测仪表,进行了温度变化时土壤硝态氮检测的对比实验。结果表明,设计的硬件抗干扰电路可以使测量仪表准确采集混杂在高频噪声中的离子选择性电极电势信号(误差和波动均小于1mV),具有良好的准确度和抗干扰能力;当温度变化时,嵌入温度校正模型时仪表测量的相对误差不大于8.20%,与离子色谱法(参考值)进行相关性分析的相关系数R达到0.9986,可有效减小由温度变化引起的电极测量误差,提高检测精度。
Du Shangfeng  Cao Shushu  Pan Qi  Zhu Ying  Feng Lei
China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University and China Agricultural University
Key Words:soil nitrate nitrogen  ion selective electrode  accuracy detection
Abstract:Ion selective electrode (ISE) is a quick and low cost method of soil nitrate nitrogen detection. Aiming at improving the accuracy of ISE based soil nitrate nitrogen detection, influences of ISE signal characteristics (small signal of millivolt level and high internal resistance) and environmental factors (noise and temperature influence) on detection precision were discussed at first. Second, how to improve the accuracy was researched. For anti interference and collection of accurate ISE potential, signal conditioning module including impedance transformation, filtering and amplification was added to detection circuit. Besides, measurement model was amended by software temperature correction for decreasing the influence of temperature. And then, two groups of contrast experiments were designed and conducted. One was the collection of ISE potential signals measured by detection circuit with impedance transformation and filtering module and by detection circuit without this module. The other one was the detection of soil nitrate nitrogen content measured by linear regression model and temperature correction model. The results show that in the condition of high frequency noise, measuring error of detection circuit with impedance transformation and filtering module comparing with ion meter is less than 1mV. It has high accuracy and anti interference ability. And when the environment temperature changes, relative error of soil nitrate nitrogen content between temperature correction model and ion chromatography method is less than 8.20% and correlation coefficient R attains to 0.9986. The result of reducing error and improving accuracy is effective.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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