Method and device for detecting heavy metal content in soil based on sample box method

Abstract

The invention discloses a method and device for detecting heavy metal content in soil based on a sample box method, and relates to the technical field of agriculture and environment detection. The method comprises the following steps: acquiring a soil sample of which the heavy metal content does not exceed the standard, pretreating to prepare a standard soil sample, putting the standard soil sample into a sample box, acquiring a terahertz pulse time-domain waveform of the standard soil sample, establishing a fingerprint spectrum bank, and comparing a terahertz spectrum of the soil sample to be tested after the pretreatment with the fingerprint spectrum bank of the standard soil sample, thereby acquiring the heavy metal data of the soil sample to be tested. By adopting the method and the device, heavy metal pollution qualitative and quantitative detection on the soil sample acquired in fields can be efficiently, rapidly, nondestructively and safely performed, and theory and method basis are provided for application of terahertz spectrum technique to detection on important physical and chemical parameters of agricultural soil and application technique development and study.

Description

technical field [0001] The invention relates to the technical field of agricultural and environmental detection, in particular to a method and device for detecting heavy metal content in soil based on a sample box method. Background technique [0002] Soil is an important growth environment for crops, and high-quality soil is an important material basis for ensuring national food and developing "high-yield, high-quality, efficient, ecological, and safe" modern agriculture. In recent years, with the rapid development of the economy, a large number of pollutants from industrial sources, domestic sources, and agricultural chemicals have entered and accumulated in farmland soil through different forms, affecting the quality of agricultural products, and then affecting food safety and ecological environment through the food chain, threatening human beings. healthy. According to online data, since 2009, there have been more than 30 major heavy metal pollution incidents in China. ...

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Problems solved by technology

[0005] Existing testing methods have the following problems: (1) The detection mostly relies on large-scale equipment, which is expensive and needs to be measured under laboratory conditions; (2) Traditional detection methods rely on the principle of atomic absorption / emission spectroscopy, and operator safety factors need to be considered ; (3), soil samples need to be digested by strong acid, and the analysis time is long, which may cause secondary pollution; (4), new detection methods such as electrochemical and biological detection are still immature, and the detection results are not reliable

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