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[1]李若飞 董发勤** 杨刚 张伟 刘明学.尼泊尔酸模与珠芽蓼对铀矿修复区重金属的累积及化学形态特征*[J].应用与环境生物学报,2019,25(05):1-15.[doi:10.19675/j.cnki.1006-687x.2019.01009]
 LI Ruofei,DONG Faqin,YANG Gang,et al.Characteristics of heavy metals accumulation and their chemical forms found for Polygonum viviparum and Rumex nepalensis in the remediation area of an abandoned uranium mine[J].Chinese Journal of Applied & Environmental Biology,2019,25(05):1-15.[doi:10.19675/j.cnki.1006-687x.2019.01009]
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尼泊尔酸模与珠芽蓼对铀矿修复区重金属的累积及化学形态特征*()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
25卷
期数:
2019年05期
页码:
1-15
栏目:
研究论文
出版日期:
2019-08-25

文章信息/Info

Title:
Characteristics of heavy metals accumulation and their chemical forms found for Polygonum viviparum and Rumex nepalensis in the remediation area of an abandoned uranium mine
作者:
李若飞1 董发勤12** 杨刚1 张伟3 刘明学1
1 西南科技大学生命科学与工程学院 绵阳 621010
2 固体废物处理与资源化教育部重点实验室 绵阳 621010
3 环境友好能源材料国家重点实验室 绵阳 621010
Author(s):
LI Ruofei1 DONG Faqin1 2YANG Gang1 ZHANG Wei3&LIU Mingxue1
1 School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
2 Key Laboratory of Solid Waste Treatment and Resource Recycling Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China 3 State Key Laboratory of Environment-friendly Energy Materials , Mianyang 621010, China
关键词:
多金属污染铀尾矿植物修复 化学赋存形态蓼科植物
Keywords:
polymetallic pollution uranium tailings phytoremediation chemical forms Polygonaceae
DOI:
10.19675/j.cnki.1006-687x.2019.01009
摘要:
为了解蓼科植物对铀矿区铀及伴生金属的富集、耐受机制,选择若尔盖铀矿修复区的2种蓼科优势植物珠芽蓼(Polygonum viviparum)和尼泊尔酸模(Rumex nepalensis),研究它们对铀及伴生金属的累积特征及其在植物组织中的化学赋存形态。通过实地采样,分析珠芽蓼和尼泊尔酸模的重金属含量,并采用化学试剂连续提取重金属元素。结果表明,该区域受 U、Cd、As、Zn、Cu重金属污染;区域污染差异为:I(露天采矿点)II(人工修复区)III(附属河流);单因子指数和综合指数表明露天采矿点和人工修复区污染严重。采样区域植物体内的Zn、Cd、Cu、Pb含量都超过植物重金属含量正常范围。尼泊尔酸模对U的转移系数和生物富集系数分别可达为16.03和 1.11;而珠芽蓼的富集系数和转移系数分别为14.85和3.83 ,珠芽蓼和尼泊尔酸模适用于 U 污染土壤的生态修复。尼泊尔酸模中U元素以去离子水提取态为主,该植物U的高富集量可能与有机酸有关,其他重金属以醋酸盐和盐酸提取态为主;珠芽蓼中大部分的重金属以迁移性较低的盐酸提取态、醋酸提取态和氯化钠提取态存在。因此,珠芽蓼和尼泊尔酸模对该铀矿修复区铀多金属胁迫具有良好的耐受与吸附性能;重金属以不活跃的化学赋存形态存在可能是 2 种蓼科植物应对重金属胁迫的重要耐受机制。
Abstract:
In this paper, the accumulation process of uranium and several other heavy metals as well as their actual chemical forms in plant tissues were studied in Polygonum viviparum and Rumex nepalensis , which are a dominant Polygonaceae plant species growing in the remediation area of Zogie uranium mine. This study will contribute to a better understanding of heavy metal absorption and tolerance by plants around polluted areas which is important for improving remediation efficiency. The composition of heavy metals in Polygonum viviparum and Rumex nepalensis were analyzed through field sampling. Their subsequent extraction from the sample using a special chemical separation method allowed to determine their chemical nature regarding their qualitative state of binding in the plant. The results showed that the soil in the remediation area was polluted by U, Cd, As, Zn and Cu.The area of contaminations were shown in declining order as follows: I (open-pit mining site) > II (artificial restoration area) >III (affiliated river); Single factor index and Nemerow comprehensive pollution index showed that serious heavy metal pollution existed in open-pit mining sites and artificial restoration areas. Furthermore, Zn, Cd, Cu and Pb in the plant samples have exceeded the normal value. The bio-enrichment coefficient ( BCF) and transfer factor(TF) of Rumex nepalensis were determined to be 16.03 and 1.11 ,respectively, and in Polygonum viviparum the values were 14.85 and 3.83,respectively. This indicates, that both plants are suitable to use for ecological remediation of U contaminated soil. Since U in Rumex nepalensis was mainly extracted with deionized water, organic acids might be the complexing ligand for U in the plants. For the other heavy metals, mainly acetate and hydrochloric acid was needed for their extraction from Rumex nepalensis which means that they should have stronger ligands. In contrast, most of the heavy metals in Polygonum viviparum could be extracted with hydrochloric acid, acetic acid and sodium chloride. Both plants, Polygonum viviparum and Rumex nepalensis, can be used for heavy metal remediation around an uranium mine. The plants show good tolerance and absorption properties for uranium and other heavy metals such as Cd, in the investigated remediation area. The heavy metals found in the plants mentioned above are relatively strongly bound to their ligands, which indicates that both Polygonaceae plant species can cope with uranium and other there with associated heavy metal stress well.

备注/Memo

备注/Memo:
收稿日期 Received: 2019-01-04 接受日期 Accepted: 2019-03-07
国家重点基础研究发展计划(2014CB846003)、国家自然科学基金资助项目(41671244)、西南科技大学龙山学术人才研究支持项目(18LZX548)、西南科技大学学生创新基金(18YCX058)资助
通讯作者Corresponding author (E-mail: fqdong @ swust.edu.cn)
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更新日期/Last Update: 2019-03-13