负载型纳米二氧化钛分离富集ICP-AES测定痕量稀土元素
作者：
梁沛;刘蕊
作者机构：
华中师范大学,化学学院,湖北,武汉,430079
会议名称：
中国化学会第九届分析化学年会暨全国原子光谱学术会议
会议时间：
2006-10-10
会议地点：
南昌
会议论文集名称：
南昌大学学报理科版
关键词：
负载型纳米二氧化钛;分离富集;稀土元素
摘要：
采用溶胶-凝胶法制备二氧化钛溶胶,将其浸渍在硅胶上,合成了负载型纳米二氧化钛材料.以ICPAES为检测手段,系统地研究了负载型纳米二氧化钛材料对稀土元素La,Y,Yb和Eu的吸附性能.结果表明,在pH 5～9范围内,所研究的稀土离子均可被定量富集,吸附的稀土离子可用1.0 mol/L的HNO3完全解脱.负载型纳米二氧化钛对La,Y,Yb和Eu的静态吸附容量分别为9.7,8.5,13.6和12.1 mg/g,与未负载的纳米二氧化钛相近.将其应用于环境标准样品中稀土元素的分离富集与测定,结果满意.
语种：
中文
展开
Dynamic liquid-phase microextraction with HPLC for the determination of phoxim in water samples
作者：
Liang, P* ;Xu, J;Guo, L;Song, F
期刊：
JOURNAL OF SEPARATION SCIENCE ,2006年29(3):366-370 ISSN：1615-9306
通讯作者：
Liang, P
作者机构：
[Song, F; Liang, P; Xu, J; Guo, L] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
关键词：
Dynamic liquid‐phase microextraction;HPLC;Phoxim
摘要：
A new method, which involves dynamic liquid-phase microextraction followed by HPLC with variable wavelength detection, was developed to determine phoxim in water samples. Experimental parameters affecting the extraction efficiency, such as extraction solvent, solvent volume, sampling volume, dwell time, number of samplings, and salt concentration were investigated. Under the optimal extraction conditions, phoxim was found to yield a good linear calibration curve in the concentration range from 0.01 to 10 μg/mL. The LOD is 2 ng/mL, and RSD at the 100 ng/ mL levels is 8.9%. Lake water and tap water samples were successfully analyzed using the proposed method. ©2006 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim.
语种：
英文
展开
Determination of trace nickel in water samples by cloud point extraction preconcentration coupled with graphite furnace atomic absorption spectrometry
作者：
Sun, Zhimei;Liang, Pei* ;Ding, Qiong;Cao, Jing
期刊：
Journal of Hazardous Materials ,2006年137(2):943-946 ISSN：0304-3894
通讯作者：
Liang, Pei
作者机构：
[Liang, Pei] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.;Huainan Normal Univ, Dept Biol & Chem, Huainan 232001, Peoples R China.
通讯机构：
[Liang, Pei] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
Cloud point extraction;Graphite furnace atomic absorption spectrometry;Nickel
摘要：
A new method based on the cloud point extraction (CPE) preconcentration and graphite furnace atomic absorption spectrometry (GFAAS) detection was proposed for the determination of trace nickel in water samples. When the micelle solution temperature is higher than the cloud point of surfactant p-octylpolyethyleneglycolphenyether (Triton X-100), the complex of Ni<sup>2+</sup> with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) could enter surfactant-rich phase and be concentrated, then determined by GFAAS. The main factors affecting the cloud point extraction were investigated in detail. An enrichment factor of 27 was obtained for the preconcentration of Ni<sup>2+</sup> with 10 mL solution. Under the optimal conditions, the detection limit of Ni<sup>2+</sup> is 0.12 ng mL<sup>-1</sup> with R.S.D. of 4.3% (n = 10, c = 100 ng mL<sup>-1</sup>). The proposed method was applied to determination of trace nickel in water samples with satisfactory results. ©2006 Elsevier B.V. All rights reserved.
语种：
英文
展开
Separation and preconcentration of silver ion using multiwalled carbon nanotubes as solid phase extraction sorbent
作者：
Ding, Qiong;Liang, Pei* ;Song, Feng;Xiang, Aiming
期刊：
Separation Science and Technology ,2006年41(12):2723-2732 ISSN：0149-6395
通讯作者：
Liang, Pei
作者机构：
[Song, Feng; Liang, Pei; Xiang, Aiming; Ding, Qiong] Cent China Normal Univ, Key Lab Pesticide & Chem Biol Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, Pei] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
FAAS;Multiwalled carbon nanotubes;Preconcentration;Silver
摘要：
A new method has been developed for the determination of silver ion based on separation and preconcentration with a microcolumn packed with multiwalled carbon nanotubes (MWNTs) prior to its determination by flame atomic absorption spectrometry (FAAS). The optimum experimental parameters for separation and preconcentration of silver, 'such as sample pH, sample flow rate and volume, elution conditions, and interfering ions, have been investigated. Silver ion can be quantitatively retained by MWNTs in the pH range 79, and then eluted completely with 1.0 M HNO 3 . The detection limit of this method for Ag was 0.60 ng mL -1 , and the relative standard deviation (RSD) was 3.8% at the 10 ng mL -1 Ag level. The method has been successfully applied for the determination of trace silver in geological and water samples.
语种：
英文
展开
动态液相微萃取-高效液相色谱法测定水样中辛硫磷
作者：
梁沛;徐婧
作者机构：
华中师范大学,化学学院,湖北,武汉,430079
会议名称：
中国化学会第九届分析化学年会暨全国原子光谱学术会议
会议时间：
2006-10-10
会议地点：
南昌
会议论文集名称：
南昌大学学报(理科版)
关键词：
液相微萃取;高效液相色谱;水样;辛硫磷;农药残留
摘要：
液相微萃取(LPME)技术是以传统的液-液萃取理论为基础,结合固相微萃取的微型化原理而提出的一种新型的分离富集技术.发展到今天,已出现静态、动态、顶空和空心纤维膜等多种方式的液相微萃取技术.辛硫磷是一种常用的高效、低毒、低残留的广谱性有机磷农药,其对光敏感,高温和光照条件下易光解,而施入土壤中残效期可达1～2个月.针对辛硫磷的热不稳定性,本文应用动态液相微萃取(DLPME)与高效液相色谱联用对环境水样中辛硫磷农药残留进行检测,结果令人满意.
语种：
中文
展开
Determination of Phenolic Compounds in Wastewater by Liquid-Phase Microextraction Coupled with Gas Chromatography
作者：
Zhang, Taozhi* ;Chen, Xinmiao;Liang, Pei;Liu, Cuixia
期刊：
JOURNAL OF CHROMATOGRAPHIC SCIENCE ,2006年44(10):619-624 ISSN：0021-9665
通讯作者：
Zhang, Taozhi
作者机构：
[Liang, Pei; Chen, Xinmiao; Liu, Cuixia; Zhang, Taozhi] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Zhang, Taozhi] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Hubei, Peoples R China.
摘要：
Liquid-phase microextraction (LPME) coupled with gas chromatography-flame ionization detection is applied to the analysis of phenolic compounds (phenol, o-cresol, m-cresol, 2,4-dimethylphenol, 2,3- dimethylphenol, and 3,4-dimethylphenol) in water samples. Experimental parameters affecting the extraction efficiency (including extraction solvent and drop volume, stirring rate, extraction time, temperature, salt concentration, and pH) are investigated and optimized. The developed protocol yields a good linear calibration curve from 5 or 20 to 10000 microg/L for the target analytes. The limits of detection are in the range of 0.94 to 1.97 microg/L, and the relative standard deviation is below 9.37%. The established method is applied to determine the phenolic pollutants in real wastewater samples from a coking plant. The recoveries of the phenolic compounds studied are from 92% to 102%, suggesting the feasibility of the LPME method for the determination of the phenolic compounds in wastewater.
语种：
英文
展开
Cloud point extraction preconcentration of manganese(II) from natural water samples using 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone and triton X-100 and determination by flame atomic absorption spectrometry
作者：
Sun, Zhimei;Liang, Pei* ;Ding, Qiong;Cao, Jing
期刊：
Analytical Sciences ,2006年22(6):911-913 ISSN：0910-6340
通讯作者：
Liang, Pei
作者机构：
[Liang, Pei] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.;Huainan Normal Univ, Dept Biol & Chem, Huainan 232001, Peoples R China.
通讯机构：
[Liang, Pei] C;Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
摘要：
The possibility was investigated by using 1-phenyl-3-methyl-4-benzoyl-5- pyrazolone (PMBP) as the chelating reagent for separation and preconcentration of manganese(II) by cloud point extraction (CPE) and subsequent determination by flame atomic absorption spectrometry (FAAS). The effects of experimental conditions such as pH, concentration of chelating agent and surfactant, equilibration temperature and time on cloud point extraction were studied. Under the optimum conditions, preconcentration of 10 ml of sample solution permitted the detection of 1.45 ng mL-1 of manganese with an enrichment factor of 20. The proposed method was applied to the determination of trace manganese in water samples with satisfactory results. 2006 © The Japan Society for Analytical Chemistry.
语种：
英文
展开
Speciation of chromium by selective separation and preconcentration of Cr(III) on an immobilized nanometer titanium dioxide microcolumn
作者：
Liang, P* ;Ding, Q;Liu, Y
期刊：
JOURNAL OF SEPARATION SCIENCE ,2006年29(2):242-247 ISSN：1615-9306
通讯作者：
Liang, P
作者机构：
[Liu, Y; Liang, P; Ding, Q] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
Chromium;Immobilized nanometer titanium dioxide;Inductively coupled plasma atomic emission spectrometry;Speciation
摘要：
Nanometer titanium dioxide immobilized on silica gel (immobilized nanometerscale TiO<inf>2</inf> particles) was prepared by a sol-gel method and characterized by X-ray diffraction and scanning electron microscopy. The adsorptive behavior of Cr(III) and Cr(VI) on immobilized nanometer TiO<inf>2</inf> was assessed. Cr(III) was selectively sorbed on immobilized nanometer TiO<inf>2</inf> in the pH range of 7-9, while Cr(VI) was found to remain in solution. A sensitive and selective method has been developed for the speciation of chromium in water samples using an immobilized nanometer TiO<inf>2</inf> microcolumn and inductively coupled plasma atomic emission spectrometry. Under optimized conditions (pH 7.0, flow rate 2.0 mL/min), Cr(III) was retained on the column, then eluted with 0.5 mol/L HNO<inf>3</inf> and determined by ICP-AES. Total chromium was determined after the reduction of Cr(VI) to Cr(III) by ascorbic acid. The adsorption capacity of immobilized nanometer TiO<inf>2</inf> for Cr(III) was found to be 7.04 mg/g. The detection limit for Cr(III) was 0.22 ng/mL and the RSD was 3.5% (n = 11, c = 100 ng/mL) with an enrichment factor of 50. The proposed method has been applied to the speciation of chromium in water samples with satisfactory results. ©2006 Wiley-VCH Verlag GmbH &Co. KGaA, Weinheim.
语种：
英文
展开
Application of continuous-flow liquid phase microextraction to the analysis of phenolic compounds in wastewater samples
作者：
Chen, Xinmiao;Zhang, Taozhi* ;Liang, Pei;Li, Yalan
期刊：
Microchimica Acta ,2006年155(3-4):415-420 ISSN：0026-3672
通讯作者：
Zhang, Taozhi
作者机构：
[Liang, Pei; Chen, Xinmiao; Li, Yalan; Zhang, Taozhi] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, Taozhi] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
continuous-flow liquid-phase microextraction;wastewater analysis;phenols
摘要：
A novel method for the determination of phenolic compounds (phenol, o-cresol, m-cresol, 2,4-dimethylphenol, 2,3-dimethylphenol and 3,4-dimethylphenol) in water samples was developed by combined continuous-flow liquid-phase microextraction (CFME) with gas chromatography-flame ionization detection (GC-FID). The effects of extraction solvent type and volume, flow rate of sample solution, extraction time, salt concentration and pH on the extraction performance were investigated and optimized. The calibration curves and analyses of real samples were obtained under the following conditions: 3.0 µL n-Amyl acetate, 1.5 mL min−1 flowing rate, 15 min extracting time and pH 1.5. The developed protocol was found to yield a linear calibration curve in the concentration ranged from 10 to 10000 µg L−1 for the target analytes, and the limits of detection ranged from 2.32 to 2.95 µg L−1. Good repeatabilities of extraction were obtained, with relative standard deviation (R.S.D.) values below 6.89%. The results demonstrated that the CFME followed with GC-FID is a simple and reliable technique for the determination of phenolic compounds in water samples.
语种：
英文
展开
浊点萃取技术在金属离子分离和富集以及形态分析中应用的进展
作者：
梁沛;李静
期刊：
理化检验-化学分册 ,2006年42(7):582-587 ISSN：1001-4020
作者机构：
华中师范大学化学学院;华中师范大学化学学院 武汉430079
关键词：
浊点萃取;金属离子;分离;富集;形态分析;综述
摘要：
介绍了新兴的环保型液液萃取方法———浊点萃取的原理及操作方法,讨论了影响浊点萃取效率的因素,重点回顾了近年来该技术在金属离子分离和富集以及形态分析中应用的进展,探讨了该技术的发展前景。
语种：
中文
展开
反相高效液相色谱法同时测定水样中辛硫磷和氯菊酯
作者：
郭丽;梁沛;刘艳;刘实
期刊：
分析试验室 ,2005年24(5):12-14 ISSN：1000-0720
作者机构：
[郭丽; 梁沛; 刘艳; 刘实] 华中师范大学化学学院;华中师范大学化学学院 武汉430079
关键词：
反相高效液相色谱法;辛硫磷;氯菊酯
摘要：
采用Agilent SB C8 (5 μm, 4.6 mm i.d. ×150 mm)色谱柱,以V(乙腈)∶V(水)=70∶30为流动相进行分离,二极管阵列检测器(PDA)在210 nm波长处检测,建立了反相高效液相色谱法同时测定辛硫磷和氯菊酯的分析方法.辛硫磷和氯菊酯的线性范围分别为0.1～10 μg/mL和0.02～10 μg/mL,检出限分别为0.05和0.01 μg/mL,实际水样的加标回收率为90.3%和95.3%,相对标准偏差为1.3%和3.2% (n=7).
语种：
中文
展开
负载型纳米二氧化钛对重金属离子吸附性能的研究
作者：
Liu, Y* ;Liang, P;Guo, L;Lu, HB
期刊：
化学学报 ,2005年63(4):312-316 ISSN：0567-7351
通讯作者：
Liu, Y
作者机构：
[Liu, Y; Lu, HB; Liang, P; Guo, L] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liu, Y] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
溶胶-凝胶法;负载型纳米二氧化钛;吸附;重金属离子
摘要：
采用溶胶-凝胶法制备二氧化钛溶胶,将其浸渍在硅胶上,合成了负载型纳米二氧化钛材料,以X射线衍射(XRD)、扫描电镜(SEM)等手段对其进行了表征.以ICP-AES为检测手段,系统地研究了负载型纳米TiO2材料对重金属离子Cd2+,Cr3+,Cu2+和Mn2+的吸附性能.结果表明,在pH 8～9范围内,所研究的重金属离子均可被定量富集,吸附的金属离子可用0.5 mol/L的HNO3完全解脱.负载型纳米二氧化钛对Cd2+,Cr3+,Cu2+和Mn2+的静态吸附容量分别为8.3,13.1,12.6和5.1 mg/g,与未负载的纳米二氧化钛相近.将其应用于环境标准样品中Cd2+,Cr3+,Cu2+和Mn2+的分离富集与测定,结果满意.
语种：
中文
展开
纳米二氧化钛分离富集ICP-AES测定镉、钴、锌的研究
作者：
Shi, TQ* ;Liang, P;Li, J;Lu, HB
期刊：
光谱学与光谱分析 ,2005年25(3):444-446 ISSN：1000-0593
通讯作者：
Shi, TQ
作者机构：
[Shi, TQ] Jinggangshan Normol Coll, Jian 343009, Peoples R China.;Cent China Normal Univ, Ctr Anal & Testing, Wuhan 430079, Peoples R China.
通讯机构：
[Shi, TQ] J;Jinggangshan Normol Coll, Jian 343009, Peoples R China.
关键词：
纳米二氧化钛;分离富集;镉;钴;锌
摘要：
建立了纳米二氧化钛分离富集, 电感耦合等离子体原子发射光谱(ICP-AES)测定镉、钴和锌的新方法. 考察了溶液pH值、洗脱条件和干扰离子等因素对分析物分离富集的影响. 结果表明, 在pH 9～10范围内, Cd, Co和Zn可被纳米TiO2定量富集, 吸附于纳米TiO2上的金属离子可用0.1 mol·L-1的硝酸溶液完全解脱. 在优化的实验条件下, 纳米TiO2对Cd, Co和Zn的吸附容量分别为8.1, 6.9和15.1 mg·g-1. 本法对Cd, Co和Zn的检出限(3σ)分别为: 5.1, 3.4和2.9 ng·mL-1, 相对标准偏差(RSD)分别为4.3%, 4.6%和4.9%(n=9, c= 0.1 μg·mL-1). 该方法已成功地应用于环境样品中镉、钴和锌的测定, 分析结果满意.
语种：
中文
展开
Speciation of chromium with cloud point extraction separation and determination by ICP-OES
作者：
Liang, P* ;Li, J
期刊：
ATOMIC SPECTROSCOPY ,2005年26(3):89-93 ISSN：0195-5373
通讯作者：
Liang, P
作者机构：
[Liang, P; Li, J] Cent China Normal Univ, Coll Chem, Wuhan, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan, Peoples R China.
关键词：
ATOMIC-ABSORPTION-SPECTROMETRY;MICELLE-MEDIATED METHODOLOGY;MASS-SPECTROMETRY;NATURAL-WATERS;PRECONCENTRATION;CHROMATOGRAPHY;PLASMA;MATRICES;CR(III);SAMPLES
摘要：
A sensitive and selective method has been developed for the speciation of chromium in natural water, based on cloud point extraction (CPE) and inductively coupled plasma optical emission spectrometry (ICPOES). Cr(III) reacts with 1-phenyl-3-methyl-4-benzoylpyrazol-5-one (PMBP), yielding a hydrophobic complex which is entrapped in the surfactant-rich phase, whereas Cr(VI) remains in the aqueous phase. Thus, separation of Cr(III) and Cr(VI) can be realized. Total chromium was determined after reduction of Cr(VI) to Cr(III) with ascorbic acid, the reducing reagent. The detection limit for Cr(Ill) was 0.81 mu g L-1, with an enrichment factor of 20 and a relative standard deviation (RSD) of 3.2% (n = 11, C = 100 mu g L-1). The proposed method was applied to the speciation of chromium in natural water samples with satisfactory results.
语种：
英文
展开
连续流动液相微萃取-高效液相色谱法测定水样中辛硫磷
作者：
郭丽;梁沛;刘艳
作者机构：
[郭丽; 梁沛; 刘艳] 华中师范大学化学学院分析测试中心,武汉,430079
会议名称：
第十五次全国色谱学术报告会
会议时间：
2005-4-21
会议地点：
郑州
会议主办单位：
中国化学会;中国色谱学会
会议论文集名称：
第十五次全国色谱学术报告会文集
关键词：
辛硫磷;农药残留;环境水样;液相微萃取;高效液相色谱法
摘要：
<正>液相微萃取（LPME）技术是在传统的液-液萃取理论的基础上,结合固相微萃取的微型化原理而提出的一种新型的分离富集技术。发展到今天,已出现静态、动态、顶空和空心纤维膜等多种方式的液相微萃取技术。辛硫磷是一种常用的高效、低毒、低残留的广谱性有机磷农药,其对光敏感,高温和光照条件下易光解,而施入土壤中残效期可达1-2个月。针对辛硫磷的热不稳定性,本文应用连续流动液相微萃取与高效液相色谱联用对环境水样中辛硫磷农药残留进行检测,结果令人满意。
语种：
中文
展开
Cloud point extraction preconcentration of trace cadmium as 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone complex and determination by flame atomic absorption spectrometry
作者：
Liang, P* ;Li, J;Yang, X
期刊：
Microchimica Acta ,2005年152(1-2):47-51 ISSN：0026-3672
通讯作者：
Liang, P
作者机构：
[Liang, P; Li, J; Yang, X] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
Cadmium;Cloud point extraction;FAAS
摘要：
A new method for the determination of trace cadmium in water samples by flame atomic absorption spectrometry (FAAS) after cloud point extraction (CPE) is proposed. The method is based on the complexation of Cd with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) in the presence of non-ionic micelles of Triton X-100. The effect of experimental conditions such as pH, concentration of chelating agent and surfactant, equilibration temperature and time on cloud point extraction was studied. Under the optimum conditions, the detection limits are 0.64 ng mL±1 with relative standard deviations (RSDs) of 2.1% (n = 10). The proposed method was applied to the determination of trace cadmium in water samples with satisfactory results. © Springer-Verlag 2005.
语种：
英文
展开
Application of multiwalled carbon nanotubes as solid phase extraction sorbent for preconcentration of trace copper in water samples
作者：
Liang, P* ;Ding, Q;Song, F
期刊：
JOURNAL OF SEPARATION SCIENCE ,2005年28(17):2339-2343 ISSN：1615-9306
通讯作者：
Liang, P
作者机构：
[Song, F; Liang, P; Ding, Q] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
Copper;FAAS;Multiwalled carbon nanotubes;Solid phase extraction
摘要：
The adsorption behavior of multiwalled carbon nanotubes (MWNTs) toward copper has been investigated systemically, and a new method has been developed for the determination of trace copper in water samples based on preconcentration with a microcolumn packed with MWNTs prior to its determination by flame atomic absorption spectrometry. The optimum experimental parameters for preconcentration of copper, such as pH of the sample, sample flow rate and volume, elution solution and interfering ions, have been investigated. Copper can be quantitatively retained by MWNTs in the pH range 5-8, and then eluted completely with 0.5 M HNO<inf>3</inf>. The detection limit of this method for Cu was 0.42 ng/mL, and the RSD was 3.5% at the 10 ng/mL Cu level. The method was validated using a certified reference material, and has been successfully applied for the determination of trace copper in water samples. ©2005 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim.
语种：
英文
展开
Application of continuous-flow liquid-phase microextraction to the analysis of volatile halohydrocarbons in water
作者：
Li, YL;Zhang, TZ;Liang, P*
期刊：
Analytica Chimica Acta ,2005年536(1-2):245-249 ISSN：0003-2670
通讯作者：
Liang, P
作者机构：
[Liang, P; Li, YL; Zhang, TZ] Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.
关键词：
continuous-flow liquid-phase microextraction;volatile halohydrocarbons;GC-mu ECD
摘要：
A novel method for the determination of four volatile halohydrocarbons (CHCl3, CCl4, C2HCl3 and C 2Cl4) in water is developed by combined continuous-flow liquid-phase microextraction (CFME) with gas chromatography microelectron capture detection (GC-μECD). The effects of extraction solvent type and volume, flow-rate of sample solution, sample volume and salt concentration on the extraction performance were investigated and optimized. The developed protocol was found to yield a linear calibration curve in the concentration range from 0.02 to 20 μg L-1 for the target analytes, and the detection limits were found to be in the low μg L-1 level, between 0.001 and 0.02 μg L-1. Good repeatabilities of extraction were obtained, with the R.S.D. values below 4.3%. The results demonstrated that the CFME followed with GC-μECD was a simple and reliable technique for the determination of volatile halohydrocarbons in water samples. © 2004 Elsevier B.V. All rights reserved.
语种：
英文
展开
Determination of La, Eu and Yb in water samples by inductively coupled plasma atomic emission spectrometry after solid phase extraction of their 1-phenyl-3-methyl-4-benzoylpyrazol-5-one complexes on silica gel column
作者：
Liang, P* ;Fa, WJ
期刊：
Microchimica Acta ,2005年150(1):15-19 ISSN：0026-3672
通讯作者：
Liang, P
作者机构：
[Liang, P; Fa, WJ] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
ICP-AES;Preconcentration;Rare earth elements
摘要：
A simple preconcentration method has been developed for the determination of trace amounts of rare earth elements (La, Eu, and Yb) in natural water samples by inductively coupled plasma atomic emission spectrometry (ICP-AES). Preconcentration of La, Eu, and Yb was achieved by sorption of their 1-phenyl-3-methyl-4-benzoylpyrazol-5-one (PMBP) complexes on a silica gel column at pH 5 and then eluting with 1.0∈mol∈L-1 HNO3. For the preconcentration of 100∈mL of aqueous solution, an enrichment of 100 was obtained for all analytes, and the detection limits for La, Eu and Yb were 82, 34 and 45∈ng∈L-1, respectively. The accuracy of this method was demonstrated by analyzing a standard reference material. The method has been successfully applied to the determination of La, Eu and Yb in lake water and synthetic seawater. © Springer-Verlag/Wien 2005.
语种：
英文
展开
Determination of trace rare earth elements by inductively coupled plasma atomic emission spectrometry after preconcentration with multiwalled carbon nanotubes
作者：
Liang, P* ;Liu, Y;Guo, L
期刊：
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY ,2005年60(1):125-129 ISSN：0584-8547
通讯作者：
Liang, P
作者机构：
[Liu, Y; Liang, P; Guo, L] Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
通讯机构：
[Liang, P] C;Cent China Normal Univ, Coll Chem, Wuhan 430079, Peoples R China.
关键词：
multiwalled carbon nanotubes;preconcentration;rare earth elements;ICP-AES
摘要：
A new method has been developed for the determination of trace rare earth elements (REEs) in water samples based on preconcentration with a microcolumn packed with multiwalled carbon nanotubes (MWNTs) prior to their determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). The optimum experimental parameters for preconcentration of REEs, such as pH of the sample, sample flow rate and volume, elution solution and interfering ions, have been investigated. The studied REEs ions can be quantitatively retained by MWNTs when the pH exceed 3.0, and then eluted completely with 1.0 mol L−1 HNO3. The detection limits of this method for REEs was between 3 and 57 ng L−1, and the relative standard deviations (RSDs) for the determination of REEs at 10 ng mL−1 level were found to be less than 6% when processing 100 mL sample solution. The method was validated using a certified reference material, and has been successfully applied for the determination of trace rare earth elements in lake water and synthetic seawater with satisfactory results.
语种：
英文
展开
