|
Lead is harmful heavy metal elements , with the worsening environmental pollution , lead enters the body through the food chain , soil , water , air and other ways , especially the more serious impact on children , so universal blood lead testing and improving lead detection rate , improve our public groups , particularly young children 's physical fitness is important , for this purpose , the purpose of this paper is the development of high precision and high efficiency of blood lead detector has broad application prospects . Are many methods of measuring blood lead , the main the zinc protoporphyrin method Differential Potentiometric Stripping , anodic stripping voltammetry , graphite furnace atomic absorption spectrometry , plasma mass spectrometry ICP -MS , hydride generation - atomic fluorescence spectrometry , etc. . Internationally recognized as the precise determination of blood lead levels : graphite furnace atomic absorption spectrometry (GFAAS) and anodic stripping voltammetry (ASV). In both methods , the graphite furnace atomic absorption spectrometry demanding requirements of the sample handling and working environment , but also to have the Zeeman effect background correction system , and to ensure stable wavelength for the analysis of lead at 283.3nm, application limitations. Stripping voltammetry differential pulse anodic stripping voltammetry under the premise of a comprehensive comparison of blood lead measurement method , the paper , it is a high - sensitivity electrochemical analysis techniques , has been applied to a variety of trace metals quantitative analysis , with a score optical photometric sensitivity compared with the atomic absorption method investment is small , convenient , fast , etc. . The paper to achieve the acquisition of the blood sample test data , quantitative analysis , data storage , display of measurement results , and complete serial communication with the computer , and post-processing of the measurement results . Upload test data through the microcontroller , the data for statistical analysis. This thesis, the application of differential pulse anodic stripping voltammetry determination of blood lead , the best measurement conditions , to establish the determination method . The same time , the measurement results were repeated experiment to verify the stability of differential pulse anodic stripping voltammetry of frozen cattle blood lead component analysis of standard substances accuracy experiments , usability analysis and comparison based on analogy the introduction of improved graphite furnace atomic absorption spectrometry , hydride generation atomic fluorescence spectrometry , with satisfactory results .
|