| 氨基泡塑的合成及其应用于富集地质样品中的痕量金 |
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| 引用本文： | 王红月,刘艳红,薛丁帅.氨基泡塑的合成及其应用于富集地质样品中的痕量金[J].岩矿测试,2016,35(4):409-414. |
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| 作者姓名： | 王红月 刘艳红 薛丁帅 |
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| 作者单位： | 重庆交通大学河海学院, 重庆 400074,重庆交通大学河海学院, 重庆 400074,重庆交通大学河海学院, 重庆 400074 |
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| 基金项目： | 重庆市基础与前沿研究计划项目（cstc2014jcyjA20011） |
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| 摘 要： | 采用泡塑(PUF)富集,AAS或ICP-OES测定地质样品中痕量金是常用的分析方法。与活性炭相比,PUF的选择性好,但吸附容量偏低,可将泡塑负载不同的萃取剂或修饰不同的官能团提高吸附容量。本文将聚醚型泡塑经盐酸水解制备成氨基泡塑(PUF-NH_2)。红外光谱和扫描电镜表征显示,PUF-NH_2峰形发生了明显红移(3376.5 cm-1),其中的氨基数量显著增加,另外PUF-NH_2的高分子出现明显断裂,发生水解后裸露出的氨基具有还原性,在吸附金的过程中易与金离子在PUF-NH_2表面发生氧化还原反应,形成金纳米颗粒。改性后的PUF-NH_2吸附容量达到96 mg/g,与PUF相比提高了8倍。将PUF-NH_2应用于富集地质样品中的金,经炭化灼烧、50%王水提取后用ICP-OES测定,金的加标回收率在95.0%~105.0%之间,检出限为0.15μg/g。实验证明用PUF-NH_2处理样品提高了富集倍数和分析灵敏度,有利于低品位矿石的分析。
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| 关 键 词： | 三峡库区 澎溪河 消落带 土壤 重金属 生态评价 |
| 收稿时间： | 2016/1/13 0:00:00 |
| 修稿时间： | 2016/5/20 0:00:00 |
Synthesis of Amino Polyurethane Foam and Its Application in Trace Gold Enrichment in Geological Samples |
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| WANG Hong-yue,LIU Yan-hong and XUE Ding-shuai.Synthesis of Amino Polyurethane Foam and Its Application in Trace Gold Enrichment in Geological Samples[J].Rock and Mineral Analysis,2016,35(4):409-414. |
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| Authors: | WANG Hong-yue LIU Yan-hong and XUE Ding-shuai |
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| Institution: | School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China,School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China and School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China |
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| Abstract: | To investigate the spatial and temporal characteristics of soil heavy metals in Pengxi River, eight sampling sites from Quma town to Pengxi estuary were chosen. The five heavy metal pollutants were lead, copper, chromium, cadmium and manganese. The concentration of heavy metals in soils of water-level-fluctuating zone of Pengxi River and in the coastal soil of the river were tested, besides, we have evaluated the pollution degree of such metal contaminants in the soils as well as the levels of the potential ecological risks, with the methods of geo-accumulation index and the risk assessment code. The results of our investigation indicated that contents of heavy metal in soils of water-level-fluctuating zone of Pengxi River become higher than that in the coastal soil of the river. The average contents of Pb, Cu, Cr, Cd and Mn in the soils of water-level-fluctuating zone were respectively 68.70, 36.96, 55.08, 2.03 and 737.59 mg/kg. The geo-accumulation index analysis suggested slightly serious pollution of Cd, slight degree of Pb, and unpolluted degree of Cu, Cr and Mn. The pollution degree followed: Cd > Pb > Cu > Mn > Cr. Fractionation studies indicated that the chemical fraction composition characteristics of heavy metals were different. Cd was mainly found in exchangeable and carbonates fraction, which indicated that Cd exhibited greatest bioavailability and ecological risk. Risk assessment code (RAC) analysis indicated that the ecological risk followed: Cd > Mn > Cu > Pb > Cr. In general, Cd exhibited high content and morphological instability in soils of water-level-fluctuating zone and consequently this element posed a high ecological risk. |
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| Keywords: | Three Gorge Reservoir Pengxi River water-level-fluctuating zone soils heavy metals environmental risk assessment |
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