One-time Digestion Method for Determination of Lead,Cadmium,Chromium,Mercury and Arsenic in Agricultural Products by Spectroscopy
In order to reduce the detection time and overall cost,the detection methods of lead,cadmium,chromium,mercury and arsenic in agricultural products were improved,and the detection conditions were optimized and coordinately tested,the feasibility of detecting 5 heavy metal elements with one digestion was explored.Through theoretical analysis and experimental research,the methods of national standards and on mature literature were referenced,hydrochloric acid and perchloric acid were added for digestion,pre-digestion at 120℃for 30 min was carried out,after digestion and acid driving,20 g/L thiourea+50 g/L ascorbic acid solution was added when transferring and volume fixing,ammonium dihydrogen phosphate matrix modifier was added to detect lead and cadmium,arsenic and mercury were detected simultaneously.By condition trade-offs and optimization,the purpose of simultaneous detection using atomic absorption(AAS)and atomic fluorescence(AFS)was achieved.The standard materials and solutions were tested,the measured values are all within the uncertainty range of 1 times,so the accuracy is good.The relative deviation is less than 20%,so the precision is good.The method is accurate and simplep,so it is suitable for the determination of Pb,Cd,Cr,Hg and As in agricultural products by using AAS and AFS.
agricultural productsheavy metalssimultaneous detectionlead,cadmium,chromium,mercury and arsenic
国家科技期刊平台
NSTL
万方数据
维普
