Sensor array and method for quickly detecting soil nitrate nitrogen

A sensor array and detection sensor technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve problems such as unsatisfactory selectivity, and achieve the effects of wide applicability, easy expansion, and good scalability

Inactive Publication Date: 2012-05-02
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the unsatisfactory selectivity of the conventional polyvinyl chloride ion selective electrode used for soil nitrate nitrogen detection sensor

Method used

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  • Sensor array and method for quickly detecting soil nitrate nitrogen
  • Sensor array and method for quickly detecting soil nitrate nitrogen
  • Sensor array and method for quickly detecting soil nitrate nitrogen

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Experimental program
Comparison scheme
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preparation example Construction

[0038] The preparation method of soil nitrate nitrogen sensor array of the present invention comprises the following steps:

[0039] A1. Preparation and pretreatment of graphite carbon rod substrate

[0040] The substrate material of the polypyrrole polymer sensitive film sensor is graphite carbon rod 2 , and the preparation process is as follows: firstly, graphite carbon rod is put into glass tube 3 and filled with epoxy resin 4 . In order to control the effective reaction area of ​​the sensor, the filling process of the epoxy resin should be slow and uniform to prevent air bubbles as much as possible; after packaging, the sensor should be ventilated and dried for 3-5 days, and the surface of the sensor should be treated after the epoxy resin is completely cured .

[0041] The pretreatment steps of the sensor surface are as follows: First, the sensor surface is polished with 30 μm, 3 μm and 0.3 μm sandpaper in sequence. After the grinding is completed, it is rinsed with abso...

Embodiment

[0064] 100 groups of soil samples from a spring wheat experimental field were collected from an experimental base in Xiaotangshan, Beijing. The collected soil samples were all dried at a low temperature of 55°C for 8 hours, ground by a soil grinder and passed through a 40-mesh analytical sieve. During the extraction process, take 10g of soil samples and add 25ml of extraction agent to shake for 30 minutes to make it homogenized. After the shaken soil extraction suspension was left to stand for 2 hours, it was filtered with medium-speed quantitative analysis filter paper to obtain a clarified soil extraction solution.

[0065] Before the analysis and measurement, the sensor array is calibrated first: the sensor array is cleaned with deionized water until the detection potential value between the potential measurement value of the 4-channel sensor and the reference electrode is stable; then, 10 -5 、10 -4 、10 -3 、10 -2 、10 -1 mol / L NaNO 3 , passing through the sensor array ...

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Abstract

The invention relates to the technical field of quick detection of soil nutrient and discloses a sensor array for quickly detecting soil nitrate nitrogen. The sensor array comprises a silver-silver chloride reference electrode and multiple polypyrrole polymer sensitive film sensors; the reference electrode and the multiple sensors are arranged in parallel; and each sensor comprises a substrate and a polypyrrole polymer film which is located on the substrate and is doped with nitrate radical. The invention also provides a method for detecting nitrate nitrogen content by utilizing the sensor array. According to the invention, the problems such as undesirable selectivity and the like in the conventional polyvinyl chloride ion selective electrode for the soil nitrate nitrogen detection sensor can be solved.

Description

technical field [0001] The invention relates to the technical field of rapid detection of soil nutrient, in particular to a sensor array for rapid detection of soil nitrate nitrogen and a detection method thereof. Background technique [0002] Soil and water are the source of human life and an important prerequisite for social civilization and economic development. In the 21st century, China's population continues to grow, but the total amount of arable land is decreasing year by year. In order to ensure food security and increase the output of economic crops, intensive agricultural production featuring "high chemical fertilizer input" has become popular. Among them, secondary salinization of soil, nitrate pollution of surface water and groundwater, decline in the quality of agricultural products, and greenhouse gas emissions caused by over-application of nitrogen fertilizers are particularly serious. By testing the nitrate nitrogen content of the soil root layer profile, n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
Inventor 张淼汪懋华张丽楠盛明娅
Owner CHINA AGRI UNIV
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