| 摘要: |
| 为快速、低成本地获取土壤铅元素含量信息,设计开发一种土壤铅元素快速检测系统。该系统基于阳极溶出伏安法检测原理设计,由土壤铅元素检测仪和上位机数据处理软件组成。土壤铅元素检测仪基于阳极溶出伏安法检测原理设计,以MSP430混合信号处理器为控制核心,集恒电势仪、电流-电压转换放大电路、电源模块为一体,通过RS232串口通信协议与上位机连接。上位机数据处理软件负责向检测仪发送指令和检测参数,并接收检测仪采集到的数据,进行数据分析。使用标准铅离子溶液进行检测试验,结果表明:该土壤铅元素快速检测系统检测得到的溶出峰电流与铅离子浓度具有良好的线性度,相关系数R2=0.995 1。采用该检测系统对取自不同种植区的16个土壤样本的浸提液进行铅离子浓度检测,其检测结果与原子吸收光谱法检测结果的相对误差<8%,且具有很好的重复性。该系统能够实现农田土壤铅元素的快速检测。 |
| 关键词: 土壤 铅 电化学分析 快速检测 |
| DOI：10.11841/j.issn.1007-4333.2015.01.022 |
| 投稿时间：2014-04-01 |
| 基金项目:高等学校博士学科点专项科研基金(20120008110033) |
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| Development and application of a rapid detecting system for lead in soil |
|
ZHANG Zhi-hao, WANG Zhi-qiang, WANG Hui, DUAN Yu-yao, LIU Gang
|
| (Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, Key Laboratory of Agriculture Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China) |
| Abstract: |
| Lead in soil can enter human body via food chain,and has a great detrimental effect on human health.In order to obtain the content of lead in soil,in this paper,a system of detecting lead in soil was developed on the basis of electrochemical.The system integrated a lead detecting instrument and data processing software,which was capable of measuring the concentration of lead in soil extract rapidly on the principle of anodic stripping voltammetry.The lead detecting instrument used a MSP430 processor as a control unit,and consisted of a potentiostat,a current acquisition equipment and a power supply system.It communicated with computer via serial port.The data processing software sent command and parameters to the instrument,and then received and analyzed the data.This system possessed the advantages of inexpensive,low-power,portable and rapid detection.The system was tested with a series of standard solutions,of which lead concentration ranged from 10 nmol/L to 10 mol/L.The tests showed that the linearity between the concentration of these solutions and the dissolving peak current detected by the system was well with R2=0.995 1.16 soil extract samples were measured with the system as well as atomic absorption spectrometry method,and the relative error between them was less than 8%.It was concluded that this lead detecting system was suitable for rapid evaluation and measurement of lead in soil. |
| Key words: soil lead electrochemical rapid detection |
