The Mechanism And Technology Of Soil Heavy Mental Detection Based On Nano-electrode Array Sensory

Heavy metal contamination of soil as an "invisible pollution", not only affect the ecological environment but also with everyone "safe food" are closely related. How to effectively monitor the concentration of heavy metals in soil and curb heavy metal pollution incidents, to become the most important issue that must be addressed in the soil remediation.First, this paper expounded the significance and status of early warning monitor of heavy metals; include the soil heavy metal pollution, detection technology and de-noising analysis techniques three aspect. Analysis of the advantages of nano-electrodes, introduced nano-electrode design and production methods, the method modified electrode nanomaterials. Next, from a global perspective to designed detect early warning system, and study the influence of the internal parameters of a three-electrode equivalent circuit and simplified equivalent circuit, designed and implemented the detection circuit and analyze the detection performance. Then, in data processing, we study the wavelet technology, when N is large enough, the hard threshold λ=σ√21gN exist defect. In order to overcome the defect, we improvement and optimization of the threshold, and introduction of soft threshold, the improved soft threshold can decomposition scale thresholding to determine the depth, the simulation shows that the improved soft threshold has better de-noising performance than traditional hard threshold. Studied the intrinsic relationship among of scanning electron potential peak current and the ion concentration, and we proposed ion recognition algorithm based on local extreme peak windowing and linear regression fitting algorithm, the simulation shows the effectiveness of the algorithm. Finally, we study the propagation of heavy metals in the soil, according to the law of conservation of mass and diffusion, and use mathematical ideas subdivision calculus; we propose a soil heavy metal pollution propagation model based on the law of conservation of mass and diffusion, the model can predicted the trends of heavy metal content, in the case of know pollution source.