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An All-Solid-State Nitrate Ion-Selective Electrode with Nanohybrids Composite Films for In-Situ Soil Nutrient Monitoring

机译:纳米杂化复合膜全固态硝酸盐离子选择电极用于土壤原位养分监测

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摘要

In this paper, an all-solid-state nitrate doped polypyrrole (PPy(NO ) ion-selective electrode (ISE) was prepared with a nanohybrid composite film of gold nanoparticles (AuNPs) and electrochemically reduced graphene oxide (ERGO). Preliminary tests on the ISE based in-situ soil nitrate–nitrogen (NO -N) monitoring was conducted in a laboratory 3-stage column. Comparisons were made between the NO -N content of in-situ soil percolate solution and laboratory-prepared extract solution. Possible influential factors of sample depth, NO -N content, soil texture, and moisture were varied. Field-emission scanning electron microscopy (FESEM) and X-ray powder diffraction (XRD) characterized morphology and content information of the composite film of ERGO/AuNPs. Due to the performance excellence for conductivity, stability, and hydrophobicity, the ISE with ERGO/AuNPs illustrates an acceptable detection range from 10 to 10 M. The response time was determined to be about 10 s. The lifetime was 65 days, which revealed great potential for the implementation of the ERGO/AuNPs mediated ISE for in-situ NO -N monitoring. In-situ NO -N testing results conducted by the all-solid-state ISE followed a similar trend with the standard UV-VIS method.
机译:本文以金纳米颗粒(AuNPs)和电化学还原氧化石墨烯(ERGO)的纳米杂化复合膜制备了全固态硝酸盐掺杂聚吡咯(PPy(NO))离子选择电极(ISE)。在实验室三级色谱柱上进行了基于ISE的原位土壤硝态氮(NO -N)监测,比较了原位土壤渗透液和实验室制备的浸提液中NO -N含量。样品深度,NO -N含量,土壤质地和水分的影响因素各不相同,场发射扫描电子显微镜(FESEM)和X射线粉末衍射(XRD)表征了ERGO / AuNPs复合膜的形貌和含量信息。由于在电导率,稳定性和疏水性方面的卓越性能,带有ERGO / AuNPs的ISE的检测范围为10到10 M,响应时间约为10 s,使用寿命为65天。 ,这显示了实施ERGO / AuNPs介导的ISE进行原位NO -N监测的巨大潜力。全固态ISE进行的原位NO -N测试结果与标准UV-VIS方法的趋势相似。

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