Method for determining content of nitrate ions in secondary saline soil with near infrared spectrum

Abstract

The invention discloses a method for determining a content of nitrate ions (NO3<->) in secondary saline soil with a near infrared spectrum. The method comprises the following steps: determining the content of NO3<-> of a secondary saline soil sample by using a chemical analysis method; carrying out pretreatment by adopting a soil sample spectrum, establishing a relation model of different variable full-waveband spectrums and content of NO3<-> on the basis of partial least squares (PLSR), and selecting an optimum spectral transformation form; selecting a characteristic waveband of the NO3<-> by adopting an interval partial least squares (iPLS) under the selected spectral transformation, and acquiring a model with the optimum precision, i.e. the relation spectral model of the NO3<-> in the secondary saline soil by virtue of cross verification by utilizing PLSR regression on the basis of the selected characteristic waveband. According to the method, the near infrared spectrum data of the secondary saline soil sample with unknown concentration is determined, the data is preprocessed and substituted in the relation spectral model, and the content of the NO3<-> in the unknown soil sample can be directly obtained.

Description

technical field [0001] The invention relates to the fields of soil monitoring and spectroscopic analysis, in particular to a method for measuring nitrate ions (NO 3 — ) content method. Background technique [0002] Secondary salinization of soil, also known as "secondary salinization", is a problem of secondary salinization of soil caused by unreasonable cultivation and irrigation or artificial unreasonable measures, which greatly restricts the development of agriculture in our country. The accumulation of nitrate in the secondary salinization of soil is one of the main characteristics of secondary salinization of soil. Therefore, real-time, efficient, rapid and non-destructive monitoring of soil NO 3 — The content and quantitative analysis are of great significance to the formation and remediation process of secondary salinized soil. [0003] NO 3 — The determination of content mainly includes traditional chemical analysis method, ion chromatography, optical analysis...

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Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the purpose of the present invention is to address the deficiencies of the prior art and the secondary salinization of NO in soil samples. 3 — To meet the needs of content detection, solve the problems of time-consuming, labor-intensive, hysteresis, consumption of chemicals and easy damage to original soil samples in existing detection methods

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