Abstract:In order to establish an easy and fast method to investigate the accumulation rate of heavy metals in soil, samples were collected from the soils on 4sections adjacent a steel smelter near Lanzhou city and their magnetic susceptibility were measured. The data show that the magnetic susceptibilities fast decrease on the section downward. This variation trend can be formulated by a high reliability equation. Using the equation after integrating processing, the newly increased accumulation mass of magnetic susceptibility of soils for each section were calculated. Then the accumulation rate of magnetic susceptibility for each soil layer of the section was calculated according to the running time of the steel smelter. The result shows that the magnetic mineral mainly concentrated in the topmost 1cm soil layer, which accounts for about 70.24%~97.56% of the newly increased accumulation mass of magnetic susceptibility in soil. The magnetic susceptibilities of the soils below 1cm on the section are slightly various. The newly increased accumulation rate of magnetic susceptibility for 4sections are respectively 6.5472×10-8m3/(kg·a), 40.4178×10-8m3/(kg·a), 49.7683× 10-8m3/(kg·a) and 31.8679×10-8m3/(kg·a). The value is maximum in the topsoil above 1cm depth, and it decreases fast down to the 5cm depth on each section. In horizontal, the accumulation rate of magnetic susceptibility of soils in the downwind area is as 4.87 to 7.60 times as that in the upwind area. Therefore, it is feasible and reliable to obtain the newly increased accumulation rate of soil using the variation trend of magnetic susceptibility on the section. This method can reflect the continuous accumulation process of the heavy metals in the soils.
吕玉甲, 戴霜, 张有贤, 栗泽苑, 丁雷. 兰州某钢厂周边土壤中磁化率积累速率研究[J]. 中国环境科学, 2015, 35(7): 2112-2118.
吕Yu-Jia , DAI Shuang, ZHANG You-Xian, LI Ze-Yuan, DING Lei. Magnetic susceptibility accumulation rates in soils near a steel smelter in Lanzhou. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(7): 2112-2118.