| 多壁碳纳米管固相萃取快速检测水样中铅镉铜铁 |
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| 引用本文： | 孙娜,迟晓峰,胡风祖,杨月琴.多壁碳纳米管固相萃取快速检测水样中铅镉铜铁[J].岩矿测试,2014,33(4):545-550. |
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| 作者姓名： | 孙娜 迟晓峰 胡风祖 杨月琴 |
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| 作者单位： | 青海省产品质量监督检验所, 青海 西宁 810008;中国科学院西北高原生物研究所, 青海 西宁 810008;中国科学院西北高原生物研究所, 青海 西宁 810008;中国科学院西北高原生物研究所, 青海 西宁 810008;河南科技大学, 河南 洛阳 471003 |
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| 基金项目： | 国家自然科学基金项目（41203018）；青海省科技基础平台建设项目（2012-T-Y19） |
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| 摘 要： | 传统的固相萃取填料应用于环境样品的重金属处理过程中,存在pH不稳定和不同极性萃取物共同萃取较为困难等方面的不足,因此寻找新型固相萃取填料显得尤为重要。本文采用多壁碳纳米管填充固相萃取柱,萃取水中金属元素铅、镉、铜和铁,采用石墨炉原子吸收光谱法测定铅和镉,电感耦合等离子体发射光谱法测定铜和铁。实验考察了多壁碳纳米管的性质、溶液pH值、洗脱溶液、样品流速以及基体效应对测定结果的影响。结果显示:溶液pH=9,1 mol/L硝酸为洗脱溶液,样品流速为2 mL/min时,外径8 nm未修饰的多壁碳纳米管有较好的萃取效率,对溶液中铅、镉、铜和铁的最大吸附容量分别为44.91、42.31、54.68和49.07 mg/g,四种元素的吸附容量均衡;钾、钠、钙、镁离子以及苯和甲苯等基质对四种金属元素的萃取影响不大。方法回收率为95.3%~99.5%,精密度(RSD,n=7)为1.2%~3.2%。本方法采用外径8 nm的多壁碳纳米管固相萃取,与传统萃取方法相比,富集效果好、回收率较高,而且操作简便、准确度高;与前人采用外径20~30 nm的多壁碳纳米管的性能相比,镉和铜的吸附容量更高,还可实现对铁的吸附,且铅、镉、铜和铁四种元素的吸附容量均衡,更适合用于检测水样中的金属元素。
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| 关 键 词： | 水样 铅 镉 铜 铁 固相萃取 多壁碳纳米管 |
| 收稿时间： | 2013/10/31 0:00:00 |
| 修稿时间： | 2014/4/26 0:00:00 |
Determination of Lead, Cadmium, Copper and Iron Contents in Water by Multi-walled Carbon Nanotubes-solid Phase Extraction |
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| SUN N,CHI Xiao-feng,HU Feng-zu and YANG Yue-qin.Determination of Lead, Cadmium, Copper and Iron Contents in Water by Multi-walled Carbon Nanotubes-solid Phase Extraction[J].Rock and Mineral Analysis,2014,33(4):545-550. |
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| Authors: | SUN N CHI Xiao-feng HU Feng-zu and YANG Yue-qin |
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| Institution: | Institute of Qinghai Province Product Quality Supervision and Inspection, Xining 810008, China;Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China;Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China;Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China;Henan University of Science and Technology, Luoyang 471003, China |
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| Abstract: | The traditional solid phase extraction sorbent contains certain deficiencies in the progress of processing heavy metals in environmental samples, such as pH instability and co-extraction difficulty. Therefore, it is particularly important to find more efficient sorbents. A solid-phase extraction method using multi-walled carbon nanotube as absorbent materials for Pb, Cd, Cu and Fe in water has been determined. The effects of solution pH, elution solution, sample volume and matrix effects were investigated. Pb and Cd were determined by Graphite Furnace Atomic Absorption Spectrometry; alternatively, Cu and Fe were determined by inductively coupled plasma atomic emission spectrometry. Experimental results show that the extraction of the metal elements is most efficient when the pH value is 9.0 and flow rate is 2 mL/min with 1 mol/L HNO3 as the elution solution by using the unmodified multi-walled carbon nanotube (outer diameter <8 nm). The maximum adsorption capacities of multi-walled carbon nanotube for Pb, Cd, Cu and Fe are 44.91, 42.31, 54.68 and 49.07 mg/g, respectively. K+, Na+, Ca2+, Mg2+, benzene and toluene have little effect on Pb, Cd, Cu and Fe extraction. The recoveries of Pb, Cd, Cu and Fe were 95.3%-99.5%, and RSD values (n=7) were 1.2%-3.2%, respectively. Compared with the traditional extraction method, this new method not only has high recovery and enrichment effect, but also is simple and accurate, which can be used in the detection of Cd, Cu, Fe and Pb in environmental water samples. |
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| Keywords: | water samples Pb Cd Cu Fe solid phase extraction multi-walled carbon nanotubes |
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