Chitosan modified ordered mesoporous silica as micro-column packing materials for on-line flow injection-inductively coupled plasma optical emission spectrometry determination of trace heavy metals in environmental water samples
Chitosan modified ordered mesoporous silica as micro-column packing materials for on-line flow injection-inductively coupled plasma optical emission spectrometry determination of trace heavy metals in environmental water samples
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DOI：
10.1016/j.talanta.2008.11.046
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发表时间：
2009-04-30
期刊：
影响因子：
6.1
通讯作者：
Huang, Chaozhang
中科院分区：
文献类型：
--
作者：
Chen, Dahui;Hu, Bin;Huang, Chaozhang
合成了一种壳聚糖修饰的有序介孔二氧化硅吸附剂，并将其作为固相萃取材料，用于流动注射（FI）微柱预富集在线电感耦合等离子体发射光谱（ICP-OES）测定环境水样中痕量重金属V、Cu、Pb、Cd和Hg。考察了pH值、上样流速、上样体积、洗脱液浓度、洗脱液体积、干扰离子等因素对目标重金属分离富集的影响。在优化的实验条件下，富集倍数为20，采样频率为10 h（-1）。V、Cu、Pb、Cd和Hg的检出限分别为0.33、0.30、0.96、0.05和0.93 ng mL（-1），相对标准偏差分别为2.8%、6.7%、1.8%、4.0%和5.3%（n = 7，C = 10 ng mL（-1））。分别研究了壳聚糖改性有序介孔二氧化硅对钒、铜、铅、镉的吸附性能。汞含量分别为16.3、21.7、22.9、12.2和13.5 mg g（-1）。为验证所建立的方法，对GSBZ 50009 -88环境水样标准物质进行了分析，测定值与标准值吻合较好。方法用于天然水样中痕量重金属的测定，结果满意。(c)2008 Elsevier B，V.保留所有权利。
A novel adsorbent of chitosan chemically modified ordered mesoporous silica was synthesized and employed as a solid phase extraction (SPE) material for flow injection (FI) micro-column preconcentration on-line coupled with inductively coupled plasma optical emission spectrometry (ICP-OES) determination of trace heavy metals V, Cu, Pb, Cd and Hg in environmental water samples. The factors affecting separation and preconcentration of target heavy metals such as pH, sample flow rate and volume, eluent concentration and volume, interfering ions were investigated. Under the optimized experimental conditions, an enrichment factor of 20 and sampling frequency of 10 h(-1) were obtained. The detection limits of the method for V, Cu, Pb, Cd and Hg were 0.33, 0.30, 0.96, 0.05 and 0.93 ng mL(-1), and the relative standard deviations (RSDs) were 2.8%, 6.7%, 1.8%, 4.0% and 5.3% (n = 7, C = 10 ng mL(-1)). respectively. The adsorption capacities of chitosan modified ordered mesoporous silica for V, Cu, Pb, Cd. and Hg were found to be 16.3, 21.7, 22.9, 12.2 and 13.5 mg g(-1) respectively. In order to validate the developed method, a certified reference material of GSBZ50009-88 environmental water sample was analyzed and the determined values were in good agreement with the certified values. The proposed method has also been applied to the determination of trace heavy metals in natural water samples with satisfactory results. (c) 2008 Elsevier B,V. All rights reserved.