Characteristic Analysis Of Heavy Metals In Rainwater In Some Typical District Of Shanghai City

Rapid progresses of science and technology promote economicdevelopment and improve the people’s living style and conditions. It isworth pointing out that of heavy metal pollutants maybe introduce into theair media with a large amount of energy is consumed and a large amount ofwaste gas and released dust. Heavy metals can accumulated, which aredifficult to be degraded in the environment.Precipitation is a kind of atmospheric wet deposition. Throughatmospheric wet deposition process, the heavy metal pollutants couldhappen "rainout" and "wash" function into precipitation. Therefore, it isessential that systematic analysis of heavy metals remaining in the rainwatersamples for the evaluation of the related environmental quality. Heavymetal pollutants in atmosphere may be entered into rainwater via thecourses of “rainout” and “washing out”. The rain water samples werecollected in one region, and the heavy metals were then analyzed. Analysisof heavy metal content in the water sample, can make an objectiveevaluation of the atmospheric environment of the region.In our studies, we collected the rain water samples from severaldistricts in Shanghai City, namnly including Hongkou, Minhang, Lingangin the period of2012April~2012October and2013Jan. The pH of therain water was determined. The heavy metals of Zn, Pb, Cd, Cu and othersin rainwater samples were determined by atomic absorption spectrometryand inductively coupled plasma mass spectrometry. The analytical data ofheavy metal distribution in Shanghai were systematically evaluated based on the Standard of Groundwater Quality, using the method of single factoranalytic hierarchy process with fuzzy mathematics.In Hongkou, Minhang, Lingang area, the result show that the pHvalue of water sample less than5.6is about47.6percent. Theconcentration of Cu, Pb, Zn and Cd is in27.3~85.57μg/L,9.87~53.2μg/L,51.32~109.14μg/L,2.03~7.81μg/L. Contrast with Environmental QualityStandards for Surface Water, the concentration are all below V class.But,compare with other datas, the concentration of heavy metal in this paper ismuch more higher and have a seasonal and regional distributioncharacteristic.The results of two kind of water quality evaluation method aredifferent.This research work can provide a theoretical basis data for theevaluation of heavy metal pollution in certain region.