Pollution Characteristics and Correlation Analysis of Heavy Metals in the Sediments of Guangliji River and the Soil of Farmland Around

Hailin Wang ； Qihang Zhang ； Tingting Meng ； Yujie Li ； Chengmeizi Fan

《International Core Journal of Engineering》 8卷7期 (2022/07) Pp. 331-339

https://doi.org/10.6919/ICJE.202207_8(7).0044

摘要

In order to analyze the pollution status and sources of heavy metals in farmland soil in the study area, taking the Guangliji river sediment and surrounding farmland soil as the research object, by measuring the contents of Cd, Cu, Zn, Pb, Cr and As in river sediments and farmland soil, the pollution characteristics and the correlation of heavy metals between in river sediments and surrounding farmland soil were analyzed. The results showed that: (1) The six heavy metal elements of Cd, Cu, Zn, Pb, As, and Cr in the sediments and farmland soils of the study area all have a high degree of accumulation; the elements with the highest accumulation coefficient are Cd. (2) Cd in sediments and farmland soil in the study area exceeded the standard, the over-standard rates were 100% and 65.2% respectively. Cu in farmland soil and Cr in sediments also exceeded the standard at some sampling points, the over-standard rates were 52.2% and 58.3%, respectively. The average values of comprehensive pollution indexes of heavy metals in farmland soil and sediment were 13.56 and 20.84, respectively, which have reached the heavy pollution level. Cd is the heavy pollution level, Cu in farmland soil is the slight pollution level, Cr in sediment is the slight pollution level. The main pollution factor of farmland soil and sediment pollution in the study area is Cd. (3) Cu and Zn, Cd and Zn, Zn and As, Cu and As was significantly correlated in farmland soils of the study area, indicating that Cu and Zn was most likely to be affected by the same external source. The correlation coefficient between Cd and Cr in sediments is 0.649, which belongs to medium correlation, and the correlation between other heavy metal elements is not obvious. The correlation coefficient between Cd in farmland soil and Cd in the sediments of Guangliji river is 0.935, which has a significant correlation, indicating that the content of Cd in farmland soil is affected by Cd in river sediments.

關鍵字

Farmland Soil ； River Sediment ； Heavy Metal Pollution Characteristics ； Correlation

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