Based On Gis Spatial Distribution Of Soil Heavy Metal Pollution And Assessment Of The Research

Rapid development of industry and agriculture make increasing waste to ourliving environment of, soil pollution is getting worse and worse. Using raw sewagefor irrigation and unreasonable use of pesticides, chemical fertilizers may bringpollutants into the soil,which include heavy metal elements. However, soil qualitywhich is high or low directly affects the quality of agricultural products.35soil samples were collected through field survey sampling in Anqiu city andthese soil specimens were analyzed which were measured Cr, As, Cd, Hg, Pb fivekinds of heavy metal content. After statistical analysis of the data processing,digitization, building attribute database and such as a series of data preprocessingactivities, inverse distance weighted interpolation method in this article were carriedout on the content of heavy metal elements and the spatial distribution of heavymetals pollution was obtained. Finally, in the light of the soil environmental qualitystandards (GB15618-1995) and of the conditions of environmental technology of thegreen food (NY/T391-2000) five kinds of heavy metal content was evaluated withsingle-factor index and Neweraw Synthetical Pollution Index, then the results wereanalyzed access to the following conclusions:(1) Overall, anqiu soil environment quality was better.35points were collectedin anqiu, items of which heavy metal Cr, Hg, Pb pollution indices have reached thefarmland soil environment quality test specification (NY/T395一2000)–primarystandard. Single-factor index of As has reached the farmland soil environment qualitytest specification (NY/T395-2000) primary and secondary standards. Only onesample point of35samples has reached in the secondary standard and the other soilsamples are to achieve the secondary standard. Single-factor index of Cd has not up tostandard:18samples belonged to clean level, two samples belonged to no pollutionlevel,9samples belonged to the mild pollution, four samples belonged to themoderate pollution,2samples belonged to high levels of pollution. In accordancewith the technical specifications of green food production environment(NY/T391-2000) five kinds of heavy metal content of35soil samples has beenevaluated and classified.The results revealed: As, Pb of a small area in Anqiu citypollution levels exceeded standard, belonging to levels of light pollution; Cd contaminated soil classification result was the same as the above; Cr, Hg singlepollution index have reached the "farmland soil environment quality inspectionspecifications"(NY/T395-2000) level of standard and the soil environmental qualitybelonged to the cleaning level.(2)Inverse distance weighted interpolation analysis has been used to get the fivekinds of spatial distribution of soil heavy metal pollution.The results revealed: Crcontent increased from the northeast to the southwest of the general, the main contentof the highest was in the southern of Huiqu town.the southeastern of Zheshantown,the northwestern of Shibuzi town,the centre of Dasheng town; As pollution levelwas high in the East, low in the West, the most serious of the towns was Xin’ an street,Dasheng town,Xing ’ an Street;Southwest of Cd pollution levels higher than thenortheast, with the various pollution levers in these communes, most parts of Xin’ anstreet,Xing ’ an Street, Linghe town, Guanzhuang town was polluted heavily; Hgcontent in the east was higher than the west, the heaviest pollution of towns were Xin’an street, Jingzhi town, Guanzhuang town,Dasheng town; Pb pollution was moreserious in the northeast than the southwest, the northeast corner of Xin ’an street andWushan town in the west was polluted heavily.（3）Diversity of spatial distribution of soil heavy metal pollution in Anqiu wasrelated to soil properties, climate and other natural factors, then,it was more related toagricultural production, industrial pollution and other human activities. Economy ofthe densely populated eastern region in Anqiu is developed and industrial pollution isserious.As a result, relative to the western region, soil heavy metal pollution in theeastern part of Anqiu city is more serious.