Rapid Determination Of Lead In The TSP Atmospheric Particles By Microwave Digestion Method

City ambient air quality is exasperate with each passing day, fog and haze phenomenonis serious with each passing day, it has been deeply aware of the environmental air qualityfor the importance of human health, so it is imminently to improve the air quality of theenvironment． Heavy metals are existence in the form of atmospheric particles in theambient air． The heavy metals pollution in the air is more difficult to control as the waterpollution and soil pollution, at the same time management methods often need to bedesigned according to different pollution conditions and there is no single solution． Lead isa hazardous substance that difficult degradation in the environment, the world is alsoattached great importance on the lead pollution problems difficult to deal with． The maincharacteristics of the pollution are toxic, concealment, long-term and irreversible． So it isnecessary to determine and monitor the specific metal pollutants in the air．The lead content in the earth’s crust does not exist in nature; the lead has very smallamounts in the natural． But the lead mineral easily gathered, the melting point has a verylow degree (328), so lead is early used by people． Lead is harmful to the human body; leadin the air is primarily to dust, ash, smoke and other forms of existence． The country hasformulated strict standard, the analysis method of the lead elements has many kinds． Thepresent application more used with the flame atomic absorption method, ICP-AES method,ion selective electrode method of dissolution． These methods has many influencing factors,high check number limit, and often need to use organics extracting concentration, it is timeconsuming and impact on human health．In order to improve the sensitivity analysis of the environment of lead in the air, thispaper mainly studies the hydride generation atomic fluorescence photometric method forrapid determination of lead in the air content method; Atmospheric particulate mattercollection method in the selection of flow TSP sampler for the continuous sampling time,sampling time set for an hour every time, and collection six times a day． The sampling sitesare sited according to the meteorological parameters, and select the appropriaterepresentative point layout． After the comparison and selection, we choose the nitric acid and hydrogen peroxide system to treat with the pretreatment． And the comparison ofdifferent digestion methods, selection of microwave digestion method for heating． Use thenew glass fiber filter sampling to reduce the membrane interferences． Through the samples,blank parallel samples and recovery experiments to test the accuracy and precision of thismethod． Finally, it discussed the effect of experimental conditions on the factors andoptimal instrument parameters and so on．This article discussed the effects on the carrier liquid acidity size on the fluorescenceintensity, and has the conclusion that the effect is the best between the2%and2．5%． Italso discussed the apparatus for the intermittent flow injection speed on the results． Theinjection speed is too fast and the generation of hydrogen increases, which leads to thegeneration of unstable hydrides and influencing the measurement reproducibility． Thesample size is too small and the hydride is produced in small amounts, the fluorescenceintensity is low, which leads the results of the determination to be low．...