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水泥厂周边稻田土壤剖面磁学性质及其环境意义
李勇1, 徐炜2
1.安徽科技学院电气与电子工程学院, 安徽蚌埠 233030;2.蚌埠玻璃工业设计研究院浮法玻璃新技术国家重点实验室, 安徽蚌埠 233000
摘要:
为了研究工业粉尘对农田土壤磁学性质的影响,在水泥厂周边挖掘了2个稻田土壤剖面(L01、L02)和1个山林土壤剖面(L04),同时设置对照剖面(L03),采用环境磁学方法,分别对4个土壤剖面磁学参数、矿物成分和化学成分进行了分析。结果表明:水泥厂周边3个土壤剖面中主要矿物成分是石英、伊利石、针铁矿、蒙脱石、方解石等。稻田土壤剖面中存在亚铁磁性矿物和反铁磁性矿物,但亚铁磁性矿物含量较低,剖面L01和L02的χ(质量磁化率)、χARM(非磁滞剩磁磁化率)、SIRM(饱和等温剩磁)平均值分别为12.05×10-8 m3/kg、52.71×10-8 m3/kg、9.74×10-4 Am2/kg和9.40×10-8 m3/kg、43.82×10-8 m3/kg、7.67×10-4 Am2/kg,这2个剖面中磁性矿物粒径较粗,超顺磁性颗粒含量较低,χfd(频率磁化率)平均值分别为3.41%和3.08%。剖面L04中亚铁磁性矿物含量较高,其χχARM、SIRM平均值分别为53.85×10-8 m3/kg、393.73×10-8 m3/kg、26.90×10-4 Am2/kg,该剖面中磁性矿物粒径细,超顺磁性颗粒含量高,χfd平均值高达14.20%。由于受到水泥粉尘的影响,水泥厂周边3个土壤剖面(L01、L02、L04)0~20 cm土壤磁学性质和ωCaO(CaO质量分数)都发生了明显变化,磁性增强,磁性矿物粒径变粗,ωCaO升高,3个土壤剖面中ωCaO与磁学参数χχARM、SIRM均存在正相关关系。因此,稻田土壤剖面的磁学参数χχARM、SIRM和ωCaO对水泥粉尘的影响具有较好的指示作用,两类参数的值越高,指示稻田土壤被水泥粉尘影响越严重。
关键词:  水泥厂  稻田土壤  磁学性质  环境意义
DOI:10.13758/j.cnki.tr.2021.02.027
分类号:S53
基金项目:安徽省公益性技术应用研究联动计划项目(1704f0704060)资助。
Magnetic Properties of Paddy Soil Profiles Around Cement Industry and Their Environmental Significance
LI Yong1, XU Wei2
1.College of Electrical and Electronic Engineering, Anhui Science and Technology University, Bengbu, Anhui 233030, China;2.State Key Laboratory of Advanced Technology for Float Glass, Bengbu Glass Industry Design and Research Institution, Bengbu, Anhui 233000, China
Abstract:
In order to study the influence of cement dust on the magnetic properties of farmland soil, two perennial flipping typical paddy soil profiles (L01, L02) and one hilly area soil profile (L04) were excavated around the cement plant, and a reference profile (L03) was excavated at the same time. Environmental magnetic analysis method was employed and the magnetic parameters, mineral composition and chemical composition of the 4 soil profiles were measured. The feasibility of using magnetic parameters to indicate the pollution of cement dust to paddy soil around industrial area was discussed. Results showed that the main minerals in the 3 soil profiles around the cement plant were quartz, illite, goethite, montmorillonite and calcite. Ferrimagnetic minerals and antiferromagnetic minerals existed in the paddy soil profiles, but the contents were relatively low, the average values of mass susceptibility (χ), anhysteretic remanent susceptibility (χARM) and saturation isothermal remanent magnetization (SIRM) were 12.05×10-8 m3/kg, 52.71×10-8 m3/kg, 9.74×10-4 Am2/kg for profile L01 and 9.40×10-8 m3/kg, 43.82×10-8 m3/kg, 7.67×10-4 Am2/kg for profile L02, respectively. The magnetic mineral particle size in the 2 profiles became coarser, and the content of super-paramagnetic particles was relatively lower, the average values of 2 profiles' frequency susceptibility (χfd) were 3.41% and 3.08%, respectively. The content of ferromagnetic minerals in the hilly area soil profile L04 was very high, the average values of χ, χARM and SIRM were 53.85×10-8 m3/kg, 393.73×10-8 m3/kg and 26.90×10-4 Am2/kg, respectively. The magnetic mineral particle size in this profile was fine, the content of super-paramagnetic particles was very high, and the average value of χfd was 14.20%. Because of the influence of cement dust, the magnetic properties and ωCaO of 0-20 cm soil in the 3 soil profiles (L01, L02, L04) around the cement plant had been obviously changed, magnetism enhanced, magnetic particle size became coarser, ωCaO increased. ωCaO was significantly positively correlated with magnetic parameters χ, χARM and SIRM. In conclusion, the magnetic parameters χ, χARM, SIRM and ωCaO of paddy soil profiles can indicate well the effect of cement dust on paddy soil, the high values of these parameters usually indicate more serious pollution of cement dust to paddy soil.
Key words:  Cement factory  Paddy soil  Magnetic properties  Environmental significance

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