Chemical fractionation characteristic and risk assessment of Zn, As and Pb in sewage irrigation soils in Jinan city

doi:10.14088/j.cnki.issn0439-8114.2022.13.008

Abstract

Abstract: Sewage, as an alternative water resource, was widely used in farmland irrigation in water-deficient areas in China. Because of long-term sewage irrigation, the heavy metals in sewage were accumulated in soil, which seriously threatened the safety of agricultural products and the regional ecological environment. To explore the pollution and distribution characteristics of typical heavy metals in sewage irrigated soil in Jinan, this study collected the soils from sewage irrigation areas in Jinan. The chemical fractionation of Zn, As and Pb was analyzed by using the improved BCR sequential extraction procedure, and the contamination status and ecological risk of Zn, As and Pb in the sewage irrigated soil was evaluated by utilizing the geo-accumulation index （I_geo）. Nemerow index and potential risk assessment methods. The results showed that the average contents of Zn, As and Pb in sewage irrigated soil were up to 55.2, 12.3 and 13.9 mg/kg, respectively, which were higher than the background value. In terms of chemical fractionation, Zn, As and Pb were mainly in the form of residue fraction （F4）, with an average proportion of 51.4%, 65.4% and 55.4%, respectively. The I_geo showed that three heavy metal elements remained pollution-free. The potential ecological risk of the sewage irrigated soil was in the following order As > Pb > Zn. The RI value of the comprehensive potential ecological risk index ranged from 3.3 to 66.2, with an average value of 24.4, which indicated that the sewage irrigated soil was at the level of medium risk. Arsenic was the main pollution source, with a contribution of 58.4% to the comprehensive potential risk index.

Key words: sewage irrigation, soil, heavy metal, chemical fractionation, risk assessment, Jinan city

CLC Number:

X53
X820.4

WANG Guo-qing, WANG Shui-xin, ZHU Hui-fang, YAN Zhuo-hui. Chemical fractionation characteristic and risk assessment of Zn, As and Pb in sewage irrigation soils in Jinan city[J]. HUBEI AGRICULTURAL SCIENCES, 2022, 61(13): 41-46.

References

[1] 曾德付, 朱维斌. 我国污水灌溉存在问题和对策探讨[J]. 干旱地区农业研究,2004, 22(4): 221-224.
[2] 李小牛,周长松,杜斌,等. 北方污灌区土壤重金属污染特征分析[J]. 西北农林科技大学学报(自然科学版), 2014, 42(6): 205-212.
[3] 张滨亭, 杜兰凤. 济南污灌区农业环境质量初步评价[J]. 山东农业科学, 1985(4): 39-41.
[4] 杨新明, 庄涛, 韩磊, 等. 小清河污灌区农田土壤重金属形态分析及风险评价[J]. 环境化学, 2019, 38(3): 644-652.
[5] 李鑫. 济南市主要土壤类型在不同功能区的重金属形态分析[D].济南:山东大学,2008.
[6] 王飞. 济南南部山区典型土壤中Cr和Cd运移实验研究[D]. 济南:济南大学,2016.
[7] 何俊, 王学东, 陈世宝, 等. 典型污灌区土壤中Cd的形态、有效性及其影响因子[J]. 中国环境科学,2016, 36(10): 3056-3063.
[8] 崔向向. 污灌区毒性金属在土壤中的迁移规律研究[D]. 北京:中国地质科学院,2012.
[9] 鲁如坤. 土壤农业化学分析方法[M].北京:中国农业科技出版社, 1999.
[10] LEE C S, LI X, SHI W, et al.Metal contamination in urban, suburban, and country park soils of Hong Kong: A study based on GIS and multivariate statistics[J]. Science of the total environment,2006, 356(1-3): 45-61.
[11] NY/T 890-2004, 土壤有效态锌、锰、铁、铜含量的测定二乙三胺五乙酸(DTPA)浸提法[S].
[12] RAURET G, LÓPEZ-SÁNCHEZ J F,SAHUQUILLO A, et al. Improvement of the BCR three step sequential extraction procedure prior to the certification of new sediment and soil reference materials[J]. Journal of environmental monitoring,1999,1(1):57-61.
[13] MULLER G.Index of geoaccumulation in sediments of the Rhine river[J]. Geojournal, 1969 , 2(3):108.
[14] HAKANSON L.An ecological risk index for aquatic pollution control.A sedimentological approach[J]. Water research,1980,14(8):975-1001.
[15] 徐争启,倪师军,庹先国,等.潜在生态危害指数法评价中重金属毒性系数计算[J].环境科学与技术,2008,31(2):112-115.
[16] 杜晓林. 小清河污灌区土壤重金属形态分析及生物有效性研究[D].济南:山东大学,2012.
[17] 王存龙,夏学齐,赵西强,等. 山东省小清河沿岸土壤重金属污染分布及迁移规律[J].中国地质,2012,39(2):530-538.
[18] 胡文. 土壤-植物系统中重金属的生物有效性及其影响因素的研究[D].北京;北京林业大学,2008.
[19] 李如忠,徐晶晶,姜艳敏,等.铜陵市惠溪河滨岸带土壤重金属形态分布及风险评估[J].环境科学研究,2013,26(1):88-96.
[20] 麻冰涓,王海邻,李小超,等.河南省武陟县大田土壤重金属形态分布及潜在生态风险评价[J].安全与环境学报,2015,15(4):363-367.
[21] 王其枫,王富华,孙芳芳,等.广东韶关主要矿区周边农田土壤铅、镉的形态分布及生物有效性研究[J].农业环境科学学报,2012,31(6):1097-1103.
[22] 黄莹,李永霞,高甫威,等.小清河表层沉积物重污染区重金属赋存形态及风险评价[J].环境科学,2015,36(6):2046-2053.
[23] 丛源,陈岳龙,杨忠芳,等.北京市农田土壤重金属的化学形态及其对生态系统的潜在危害[J].土壤,2009,41(1):37-41.
[24] 陈涛,常庆瑞,刘京.长期污灌农田土壤Cd赋存形态及其有效性的空间变异研究[J].农业环境科学学报,2014,33(7):1322-1327.
[25] 辛术贞,李花粉,苏德纯.我国污灌污水中重金属含量特征及年代变化规律[J].农业环境科学学报,2011,30(11):2271-2278.