土壤-水稻系统中重金属的富集特征及对土壤元素标准限的判定
Enrichment characteristics of heavy metals in soil-rice system and determination of the standard range of soil elements
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摘要: 在调查研究广东省江门市土壤与水稻元素的含量基础上,对江门市水稻重金属元素的富集特征进行了探讨,并根据水稻重金属富集系数与土壤重金属含量的关系趋势,对暂无明确标准的土壤元素进行适宜含量的判定.结果表明,水稻重金属As、Cu、Pb、Zn、Cd、Ni、Hg和Cr元素中,部分样品Cd的富集系数大于1且小于2,表明存在一定的富集状况,其他元素的富集系数均未超过1,表明并无明显富集.水稻重金属的富集系数的顺序为:Cd > Cu > Zn > Ni > As > Hg > Cr > Pb.水稻中重金属元素的富集系数随土壤重金属含量升高的变化趋势分为两部分,开始为明显降低,当达到一个阈值时降低趋势明显变缓.与《土壤环境质量标准》Ⅰ级标准相比,除Hg和Pb超标率较高外,这个阈值基本处于各元素标准值的1/5—1/3之间,同时也表明土壤中各重金属含量值在此范围内为适宜含量.水稻中S、F、Cl、I、Ga、Sr、Se元素的富集系数与土壤对应元素的含量比值与重金属元素趋势一致,即可利用土壤重金属元素呈现的规律判断无明确标准元素的适宜含量范围.可以得出土壤中S、F、Cl、I、Ga、Sr、Se的含量适宜范围分别为:450—800、480—800、900—1500、2.4—4.0、75—125、123—205、1.2—2.0 mg·kg-1.Abstract: Based on the study of element distribution in soil and rice samples collected from Jiangmen city, Guangdong province, the enrichment characteristics of heavy metals in soil-rice system were investigated in the present study. The soil element contents with no clear standards were determined by the relationship between enrichment coefficients of heavy metals in rice and their concentrations in soil. The enrichment coefficients of Cd in rice were 1-2, indicating a certain degree of Cd enrichment in the study area. The enrichment coefficients of other elements were less than 1, showing no significant enrichment. The enrichment coefficients of heavy metals in rice are in the order:Cd > Cu > Zn > Ni > As > Hg > Cr > Pb. With the increase of heavy metal contents in soil, the enrichment factors of heavy metals in rice changed in two steps:significantly reduced at first and then the reduction slowed down when they reached corresponding threshold values. Compared with China Environmental Quality Standard for Soils (GB15618-1995, Grade I), the threshold values of heavy metals were basically within the range of 1/5-1/3 of the standard value of each element except Hg and Pb, demonstrating the content of each element within this range is appropriate. The ratio of enrichment coefficients of other elements (S, F, Cl, I, Ga, Sr and Se) in rice to the corresponding elements in soil presented the same trend with heavy metals. By using the distribution pattern of heavy metals in soil to determine the appropriate range of elements with no clear standards, it can be found that the suitable range of other elements (S, F, Cl, I, Ga, Sr and Se) in soil are 450-800、480-800、900-1500、2.4-4.0、75-125、123-205、1.2-2.0 mg·kg-1, respectively.
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[1] DUDKA S, MILLER W P. Accumulation of potentially toxic elements in plants and their transfer to human food chain[J]. Journal of Environmental Science & Health. Part. b Pesticides Food Contaminants & Agricultural Wastes, 1999, 34(4):681-708. [2] HOSSAIN M F, KHONDAKER M. Environmental contamination and seasonal variation on heavy metals in rice fields[J]. Research Journal of Chemistry and Environment, 2006, 10(1):8-12. [3] MCLAUGHLIN M J, PARKER D R, CLARKE J M. Metals and micronutrients-food safety issues[J]. Field Crops Research, 1999, 60(1-2):143-163. [4] 夏芳, 王秋爽, 蔡立梅, 等. 有色冶金区土壤-蔬菜系统重金属污染特征及健康风险分析[J]. 长江流域资源与环境, 2017, 26(6):865-873. XIA F, WANG Q S, CAI L M, et al. Contamination and health risk for heavy metals via consumption of vegetables grown in non-ferrous metals smelting area[J]. Resources and Environment in the Yangtze Basin, 2017, 26(6):865-873(in Chinese).
[5] 蒋逸骏, 胡雪峰, 舒颖, 等. 湘北某镇农田土壤-水稻系统重金属累积和稻米食用安全研究[J]. 土壤学报, 2017, 54(2):410-420. JIANG Y J, HU X F, SHU Y, et al. Accumulation of heavy metals in the soil-rice system and assessment of dietary safety of the rice produced in the paddy fields-a case study of a town in the northern part of Hunan Province, China[J]. Acta Pedologica Sinica, 2017, 54(2):410-420(in Chinese).
[6] 吴迪, 杨秀珍, 李存雄, 等. 贵州典型铅锌矿区水稻土壤和水稻中重金属含量及健康风险评价[J]. 农业环境科学学报, 2013, 32(10):1992-1998. WU D, YANG X Z, LI C X, et al. Concentrations and health risk assessments of heavy metals in soil and rice in zinc-lead mining area in Guizhou province, China[J]. Journal of Agro-Environment Science, 2013, 32(10):1992-1998(in Chinese).
[7] 张良运, 李恋卿, 潘根兴. 南方典型产地大米Cd、Zn、Se含量变异及其健康风险探讨[J]. 环境科学, 2009, 30(9):2792-2797. ZHANG L Y, LI L Q, PAN G X. Variation of Cd, Zn and Se contents of polished rice and the potential health risk for subsistence-diet farmers from typical areas of South China[J]. Chinese Journal of Environmental Science, 2009, 30(9):2792-2797(in Chinese).
[8] [9] 冯经昆, 钟山, 孙立文,等. 重庆某垃圾焚烧厂周边土壤重金属污染分布特征及来源解析[J]. 环境化学, 2014, 33(6):969-975. FENG J K, ZHONG S, SUN L W, et al. Spatial distribution and source analysis of heavy metal contamination in soil surrounding a municipal solid waste incineration plant in Chongqing[J]. Environmental Chemistry, 2014, 33(6):969-975(in Chinese).
[10] 国家环境保护局, 国家技术监督局. GB 15618-1995土壤环境质量标准[S]. 北京:中国标准出版社, 2006. National Environmental Protection Agency, State Bureau of Technical Supervision. GB15618-1995 Environmental quality standard for soils[S]. Beijing:China Standards Press, 2006 (in Chinese).
[11] 中华人民共和国卫生部. GB 2762-2005食品安全国家标准, 食品中污染物限量[S]. 北京:中国标准出版社, 2005. Ministry of Health P. R. China. GB 2762-2005 The limits of pollutants in foods[S]. Beijing:China Standards Press, 2005 (in Chinese).
[12] DIAZ O P, LEYTON I, MU OZ O, et al. Contribution of water, bread, and vegetables (raw and cooked) to dietary intake of inorganic arsenic in a rural village of Northern Chile[J]. Journal of Agricultural & Food Chemistry, 2004, 52(6):1773-1779. [13] MUNOZ O, DIAZ O P, LEYTON I, et al. Vegetables collected in the cultivated Andean area of northern Chile:Total and inorganic arsenic contents in raw vegetables[J]. Journal of Agricultural & Food Chemistry, 2002, 50(3):642-647. [14] 潘根兴, ANDREW C C, ALBERT L P等. 土壤-作物污染物迁移分配与食物安全的评价模型及其应用[J]. 应用生态学报, 2002, 13(7):854-858. PAN G X, ANDREW C C, ALBERT L P et al. Modeling transfer and partitioning of potentially toxic pollutants in soil-crop system for human food security[J]. Chinese Journal of Applied Ecology, 2002, 13(7):854-858(in Chinese).
[15] 沈体忠, 朱明祥, 肖杰. 天门市土壤-水稻系统重金属迁移积累特征及其健康风险评估[J]. 土壤通报, 2014, 45(1):221-226. SHEN T Z, ZHU M X, XIAO J. Characteristics of migration and accumulation of heavy metals in soil-rice system of Tianmen and its health risk assessment[J]. Chinese Journal of Soil Science, 2014, 45(1):221-226(in Chinese).
[16] 莫争, 王春霞, 陈琴, 等. 重金属Cu, Pb, Zn, Cr, Cd在水稻植株中的富集和分布[J]. 环境化学, 2002, 21(2):110-116. MO Z, WANG C X, CHEN Q, et al. Distribution and enrichment of heavy metals of Cu, Pb, Zn, Cr and Cd in paddy plant[J]. Environmental Chemistry, 2002, 21(2):110-116(in Chinese).
[17] 吴燕玉, 余国营. Cd、Pb、Cu、Zn、As复合污染对水稻的影响[J]. 农业环境科学学报, 1998, 17(2):49-54. WU Y Y, YU G Y. Compound pollution of Cd, Pb, Cu, Zn and As on lowland rice[J]. Journal of Agro-Environment Science, 1998, 17(2):49-54(in Chinese).
[18] 肖俊清, 袁旭音, 李继洲. 长江三角洲地区土壤和水稻重金属污染特征研究[J]. 安徽农业科学, 2010, 38(19):148-151. XIAO J Q, YUAN X Y, LI J Z. Characteristics of heavy metal pollution in soil and rice of Yangtze River Delta Region[J]. Journal of Anhui Agricultural Sciences, 2010, 38(19):148-151(in Chinese).
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