{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,11]],"date-time":"2026-04-11T19:02:21Z","timestamp":1775934141314,"version":"3.50.1"},"reference-count":37,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,4,16]],"date-time":"2020-04-16T00:00:00Z","timestamp":1586995200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Science and Technology, China","award":["2016YFD0800900-2016YFD0800907"],"award-info":[{"award-number":["2016YFD0800900-2016YFD0800907"]}]},{"name":"Ministry of Science and Technology","award":["2016YFD0700300-2016YFD0700304"],"award-info":[{"award-number":["2016YFD0700300-2016YFD0700304"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this paper, an all-solid-state nitrate doped polypyrrole (PPy(NO3\u2212) 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\u2013nitrogen (NO3\u2212-N) monitoring was conducted in a laboratory 3-stage column. Comparisons were made between the NO3\u2212-N content of in-situ soil percolate solution and laboratory-prepared extract solution. Possible influential factors of sample depth, NO3\u2212-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\u22121 to 10\u22125 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 NO3\u2212-N monitoring. In-situ NO3\u2212-N testing results conducted by the all-solid-state ISE followed a similar trend with the standard UV-VIS method.<\/jats:p>","DOI":"10.3390\/s20082270","type":"journal-article","created":{"date-parts":[[2020,4,16]],"date-time":"2020-04-16T13:01:39Z","timestamp":1587042099000},"page":"2270","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":38,"title":["An All-Solid-State Nitrate Ion-Selective Electrode with Nanohybrids Composite Films for In-Situ Soil Nutrient Monitoring"],"prefix":"10.3390","volume":"20","author":[{"given":"Ming","family":"Chen","sequence":"first","affiliation":[{"name":"Key Laboratory on Modern Precision Agriculture System Integration Research of Ministry of Education, China Agricultural University, Beijing 100083, China"}]},{"given":"Miao","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory on Modern Precision Agriculture System Integration Research of Ministry of Education, China Agricultural University, Beijing 100083, China"},{"name":"Key Lab of Agricultural Information Acquisition Technology of Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China"}]},{"given":"Xuming","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory on Modern Precision Agriculture System Integration Research of Ministry of Education, China Agricultural University, Beijing 100083, China"}]},{"given":"Qingliang","family":"Yang","sequence":"additional","affiliation":[{"name":"Key Laboratory on Modern Precision Agriculture System Integration Research of Ministry of Education, China Agricultural University, Beijing 100083, China"}]},{"given":"Maohua","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory on Modern Precision Agriculture System Integration Research of Ministry of Education, China Agricultural University, Beijing 100083, China"},{"name":"Key Lab of Agricultural Information Acquisition Technology of Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China"}]},{"given":"Gang","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory on Modern Precision Agriculture System Integration Research of Ministry of Education, China Agricultural University, Beijing 100083, China"},{"name":"Key Lab of Agricultural Information Acquisition Technology of Ministry of Agriculture and Rural Affairs, China Agricultural University, Beijing 100083, China"}]},{"given":"Lan","family":"Yao","sequence":"additional","affiliation":[{"name":"Key Laboratory on Modern Precision Agriculture System Integration Research of Ministry of Education, China Agricultural University, Beijing 100083, China"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,16]]},"reference":[{"key":"ref_1","unstructured":"(2020, April 04). 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