Lead And Cadmium Residues In Both Soil And Wheat In Jiangsu Section Along The Beijing-shanghai Highway

The soil and plant along the highway could be influenced by the special situation of the highway.The investigation about the lead and cadmium in the soil of Jiangsu section along both of Beijing-Shanghai(710?849km)and Nanjing-Hangzhou(2051?2181km)highway as well as in the wheat along the Beijing-shanghai highway was made.At pre-decided points along highways,the soil samples from the central belt of the highway,highway slope and distance 50,100 and 150 meters and the wheat samples from the distance 50,100 and 150 meters were taken,the lead and cadmium contents in soil and wheat were then determined.The main results were as follows:1.The pH at all points was around natural and did not change much at the same pint in two year measurements.From the central belt to 150 meters,there was also no overall and regular pHvalue change.The pH difference between various points may be related to geologicalcondition.2.The lead and cadmium contents in the soil along both of Beijing-Shanghai and Nanjing-Hangzhou highway from two year data showed that lead was reduce from central belt to two sides and showed a normal distribution,and there was almost no influence if the distance is over 50 meters.It should be noticed that lead in the central belt soil close to service area was higher than the soils far away from service area,and lowest was found in the middle of two services?Cadmium showed the same distribution tendency,the difference between two services was more obvious.In addition,lead in the soil of Jiangsu section along Beijing-Shanghai highway showed reducing tendency from two year data,3.The lead and cadmium residues in the wheat along the Beijing-shanghai highway showed that there was regular change among two year determination.Calculating all measured points,less than 21%of wheat within 150 meters from highway central belt was over GB 2762-2012 for both lead and cadmium residues.Statistical results indicate that there was no relationship between the contents of lead and cadmium in the soil and the residues in the wheat growing in the same place.