吕弋
分子发光分析;纳米传感分析;环境分析。
个性化签名
- 姓名:吕弋
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
- 职称:-
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学科领域:
勘查地质学
- 研究兴趣:分子发光分析;纳米传感分析;环境分析。
吕弋,1974年生,博士,教授,博士生导师。1993年至2003年在西南师范大学化学化工学院学习,先后获理学学士(1997)、工学硕士(2000)和理学博士学位(2003)。2003年至2005年在清华大学分析中心从事博士后研究工作。2005年进入四川大学化学学院工作,任教授,2006年获博士生导师资格,2007年入选教育部“新世纪优秀人才”支持计划。
主要研究兴趣:分子发光分析;纳米传感分析;环境分析。
目前,主持国家自然科学基金面上项目、国家自然科学基金青年基金项目、教育部“新世纪优秀人才”支持计划项目、教育部博士点专项基金各1 项,参与国家自然科学基金重点项目1 项。
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525
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成果数
10
吕弋, Zhenli Zhu, Sichun Zhang, Yi Lv, and Xinrong Zhang*
Anal. Chem. 2006, 78, 865-872,-0001,():
-1年11月30日
This paper describes a novel hydride atomizer based on atmospheric pressure dielectric barrier discharge (DBD) plasma. The plasma was generated with a 3700-V, 20.3-kHz, and 5-W electrical power supply and easily sustained with inert gases (He or Ar) at a flow rate of 250 mLâmin-1 after optimization. However, it cannot be sustained with N2. This atomizer offers the advantages of low operation temperature and low power consumption in comparison with the currently used electrothermal quartz atomization operated at 900℃ with a power supply of several hundred watts. To confirm the utility of the proposed atomizer, four arsenic species (As(Ⅲ), As(Ⅴ), monomethylarsonic acid (MMA), dimethylarsinic acid (DMA)) were determined by the present atomization technique. A hyphenation of HPLC coupled to hydride generation AAS with the optimized DBD atomizer has been successfully used for the speciation of arsenic in order to demonstrate the potential of this atomizer in the present study. The characteristics of the DBD atomizer and the effects of different parameters (discharge gas, gas flow rate, voltage, HCl concentration, KBH4 concentration) are discussed in the paper. Compared with other hydride atomization techniques, the proposed method shows the following features: (1) small size (70 mm×15 mm×5 mm), which is preferable for the miniaturization of the total analytical system; (2) low power consumption (≤5W), which indicates the possibility of the development of portable, fieldable analytical instrumentation for in situ detection using battery as power supply; (3) low atomizer temperature (70℃), which is in favor of the compactness of the total instruments; (4) avoidance of residue moisture removal in comparison with the existed GD system, which leads to the facility of the system. The analytical figures of the present technique were evaluated. The detection limits of As (Ⅲ), As (Ⅴ), MMA, and DMA obtained with HG-DBD-AAS were 1.0, 11.8, 2.0, and 18.0 μg·L-1, respectively. The accuracy of the system was verified by the determination of arsenic in reference material of orchard leaves SRM 1571. The concentration of As determined by the present method agreed well with the reference values. The speciation of arsenic in the freeze-dried urine SRM 2670 were carried out, and the results obtained were in agreement with the results of HPLC-ICPMS and the reported values by other laboratories.
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吕弋, Guangming Huang, Yi Lv, Sichun Zhang, Chengdui Yang, and Xinrong Zhang*
Anal. Chem. 2005, 77, 7356-7365,-0001,():
-1年11月30日
A novel aerosol chemiluminescent (CL) detector coupling to capillary electrophoresis (CE) for the detection of saccharides is reported. This CL detector is composed of a postcapillary nebulizer and porous alumina as catalyzer in quartz tube. The CL emission could be generated due to the catalyzing oxidization of saccharides on the surface of porous alumina. The saccharides such as sucrose, r-lactose, maltose, raffinose, galactose, xylose, and glucose with only weak UV absorbance can be successfully detected. The linear ranges of those saccharides are from 30-2000 to 50-2000 mg/L; relative standard deviations range from 2.1 to 3.7% (200mg/L, n=11). Compared with the traditional UV detector currently used in CE, this novel detector shows the advantage of high sensitivity to the compounds with only weak UV absorption. Thus, it could be an important supplement of CE detectors for Uvlacking compounds.
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吕弋, Yi Lv, † Sichun Zhang, † Guohong Liu, † Minwen Huang, ‡ and Xinrong Zhang*, †
Anal. Chem. 2005, 77, 1518-1525,-0001,():
-1年11月30日
This paper describes a novel aerosol chemiluminescencebased detector, which can be coupled to liquid chromatography for the determination of the chemicals with weak optical absorbance in the UV-visible region. This aerosol chemiluminescence (CL)-based detector, in which HPLC effluent is converted to aerosol and then generated CL emission on the surface of porous alumina, is composed of three main processes: nebuliztion of HPLC effluent, CL emission on surface of porous alumina material, and optical detection. To demonstrate the utility of the aerosol chemiluminescence detector, some compounds such saccharides, poly(ethylene glycol)s, amino acids, and steroid pharmaceuticals are determined by the present aerosol chemiluminescence detection method. Compared with an evaporative light scattering detector, the proposed detector shows the following features: (a) extensive CL emissions on porous alumina by many compounds tested, which leads to the potential application for the determination of volatile and nonvolatile chemicals with or without UV-visible absorbance; (b) a CL mechanism based on the catalytic oxidation of analytes, not on the light scattering, which suggests the present detector be free from the interference of the inorganic and nonvolatile mobile-phase modifiers. The CL characteristics and effect of different parameters, such as temperature and nebulizer gas flow rate, were also discussed in this paper. Furthermore, this aerosol chemiluminescence-based detector was successfully applied to the determination of raffinose, glucose, sucrose, maltose, and r-lactose.
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吕弋, Yaming Li a, Jing Hu a, Li Tang a, Yihua He a, Xi Wu a, b, Xiandeng Hou a, Yi Lv a, ∗
Journal of Chromatography A, 1192 (2008) 194-197,-0001,():
-1年11月30日
A new analytical method was proposed for the detection of volatile chlorinated hydrocarbons (VCHCs) including dichloromethane, 1, 2-dichloroethane, chloroform, tetrachloromethane, perfluoromethane and bromoform after gas chromatographic (GC) separation. Atmospheric pressure dielectric barrier discharge (DBD) was miniaturized and used as a GC detector by using chemiluminescence (CL) emission from the reaction of DBD-split VCHCs with luminol solution. The miniaturized DBD-CL detector possessed the advantages of simple construction, very low power consumption, and high sensitivity to many volatile halocarbons, especially VCHCs. The parameters of the detectorwere optimized by using dichloromethane as a typical analyte. Under the optimized experimental conditions, the limit of detection (LOD) down to sub-nmol can be achieved.
Volatile chlorinated hydrocarbons, Miniaturized dielectric barrier discharge, Chemiluminescence, Gas chromatography
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吕弋, Yingying Su a, b, He Chen b, Ying Gao b, Xiaohong Li b, Xiandeng Hou a, Yi Lv b, ∗
Journal of Chromatography B, 870 (2008) 216-221,-0001,():
-1年11月30日
Active oxygen species from the photocatalytic reaction in aqueous solution react with luminol to emit strong chemiluminescence (CL), and this can be inhibited by the UV decomposed-products of selenocystine (SeCys) or selenomethionine (SeMet). Based on this phenomenon, a novel hyphenated technique, HPLC-UV/nano-TiO2-CL, was established for the determination of SeCys and SeMet. The effects of pH, the UV irradiation time, the TiO2 coated on the inner surface of the reaction tubing, and the Co2+ catalyst concentration on the CL intensity and/or chromatographic resolution were systematically investigated. Under these optimized conditions, the inhibited CL intensity has a good linear relationship with the concentration of SeCys in the range of. 04-10.6µgmL-1 or SeMet in the range of 0.05-12.4μgmL-1, with a limit of detection (S/N=3) of 6.4μgL-1 for SeCys or 12μgL-1 for SeMet. As an example, the method was preliminarily applied to the determination of the selenoamino acids in garlic and rabbit serum, with a recovery of 88-104%.
Liquid chromatography, Photocatalytic, Chemiluminescence, Selenoamino acids
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【期刊论文】Sensitive and selective acetone sensor based on its cataluminescence from nano-La2O3 surface
吕弋, Li Tang a, Yaming Li a, Kailai Xu a, Xiandeng Hou a, b, Yi Lv a, ∗
Sensors and Actuators B 132 (2008) 243-249,-0001,():
-1年11月30日
In the present paper, a highly sensitive and selective sensor for acetone was demonstrated, which was based on intensive cataluminescence (CTL) emission on the surface of nano-sized La2O3. The CTL characteristics and the optimum conditions for the sensor, including La2O3 morphology, wavelength, working temperature, and airflow rate, were investigated in detail. Under the optimized conditions, the CTL intensity versus concentration of acetone was linear in the range of 0.19–140 gmL-1, with a correlation coefficient (r) of 0.9981 and a detection limit (signal-to-noise ratio is 3; and noise is the width of baseline) of 0.08 gmL-1. The relative standard deviation (R.S.D.) for 9.3 gmL-1 acetone (n=5) was 1.4%. There was no or weak response to common foreign substances, such as ammonia, toluene, benzene, formaldehyde, ethanol, methanol, ethyl acetate, and acetaldehyde. The gas sensor also exhibited good stability and durability for continuously introducing 19 gmL-1 acetone for 80 h over 8 days, with a long-term R.S.D. less than 5%.
La2O3, Cataluminescence, Acetone, Gas sensor
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吕弋, Rui Liu a, Peng Wu b, Kailai Xu a, Yi Lv a, *, Xiandeng Hou a, b
Spectrochimica Acta Part B 63 (2008) 704-709,-0001,():
-1年11月30日
Bismuthine was on-line trapped on tungsten coil and subsequently electrothermally vaporized for the determination by atomic fluorescence spectrometry (AFS). Several noble metals, including Pd, Rh, Pt, and Ir, were explored as permanent chemical modifier for tungsten coil on-line trapping. Investigation showed that Ir gave the best performance, in which bismuthine was on-line trapped on Ir-coated tungsten coil at 560℃, and then released at 1550℃ for subsequent transfer to AFS by a mixture of Ar and H2. Under optimum instrumental conditions, the trapping efficiency was found to be 73±3%. With 120s (12mL sample volume) trapping time, a limit of detection (LOD) of 4 ng L-1was obtained, compared to conventional hydride generation AFS (0.09μg L-1); the LOD can be lowered down to 1 ng L-1 by increasing the trapping time to 480s. The LODwas found to be better or at least comparable to literature levels involving on-line trapping and some other sophisticated instrumental methods such as ICP-MS and GF-AAS. A comprehensive interference study involving conventional hydrideforming elements and some transition metals was carried out, and the result showed that the gas phase interference fromother hydride-forming elementswas largely reduced, thanks to the use of on-line tungsten coil trapping. Finally, the proposed method was applied to the determination of bismuth in several biological and environmental standard reference materials, and a t-test shows that the analytical results by the proposed method have no significant difference from the certified values at the confidence level of 95%.
On-line trapping, Atomic fluorescence spectrometry, Tungsten coil, Iridium permanent chemical modifier, Bismuth, Hydride generation
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【期刊论文】An ethanol sensor based on cataluminescence on ZnO nanoparticles
吕弋, Huarong Tang a, Yaming Li a, Chengbin Zheng a, Jun Ye a, Xiandeng Hou a, b, Yi Lv a, ∗
Talanta 72 (2007) 1593-1597,-0001,():
-1年11月30日
A novel gas sensor for the determination of ethanol was proposed in the present work, which was based on the generated cataluminescence emission from catalytic oxidation of ethanol on the surface of ZnO nanoparticles. The cataluminescence characteristics and the effect of different parameters on the signal intensity, such as morphology of synthesized ZnO, temperature and flow rate, were discussed in detail. Under the optimized experimental conditions, the calibration curve of cataluminescence intensity versus ethanol vapor concentration was linear in the range 1.0-100 ppm, and with a detection limit of 0.7 ppm (S/N=3). Compared with the traditional electrical conductivity-based ZnO gas sensor for the determination of ethanol, the proposed ethanol sensor showed the advantages of high sensitivity, high selectivity and low working temperature.
Cataluminescence, ZnO, Nanomaterials, Ethanol, Sensor
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吕弋, Xiaohong Li a, Yingying Su a, Kailai Xu a, Xiandeng Hou a, b, Yi Lv a, ∗
Talanta 72 (2007) 1728-1732,-0001,():
-1年11月30日
A simple, sensitive and interference-free method was proposed for the determination of arsenic, based on the generation of volatile arsenic trichloride coupled with atomic fluorescence spectrometry. Thiourea, together with l-ascorbic acid, was used to reduce As(Ⅴ) to As(Ⅲ), and the chloride generation was based on the reaction between As(Ⅲ) and hydrochloric acid. Under the optimized experimental conditions, the present procedure allows for the quantification of arsenic in the concentration range of 0.01-4.0mg L-1, with a limit of detection (3σ) of 6.0 gL-1. The relative standard deviation (R.S.D.) is 4.0% for 0.1 mg L-1 arsenic (n=7). Finally, the proposed method was successfully applied to the determination of arsenic in several certified reference samples (stainless steel, alloy steel, copper alloy and water sample) and real samples (brass material and spiked cobalt material), with analytical results well-agreed with those by ICP-MS.
Arsenic, Chloride generation, Atomic fluorescence spectrometry, Alloy, Water sample
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吕弋, Chunfang Han, Chengbin Zheng, Jun Wang, Guanglei Cheng, Yi Lv, Xiandeng Hou
Anal Bioanal Chem (2007) 388: 825-830,-0001,():
-1年11月30日
With UV irradiation, Hg2+ in aqueous solution can be converted into Hg0 cold vapor by low molecular weight alcohols, aldehydes, or carboxylic acids, e.g., methanol, formaldehyde, acetaldehyde, glycol, 1,2-propanediol, glycerol, acetic acid, oxalic acid, or malonic acid. It was found that the presence of nano-TiO2 more or less improved the efficiency of the photo-induced chemical/cold vapor generation (photo-CVG) with most of the organic reductants. The nano-TiO2-enhanced photo-CVG systems an be coupled to various analytical atomic spectrometric techniques for the determination of ultratrace mercury. In this work, we evaluated the application of this method to the atomic fluorescence spectrometric (AFS) determination of mercury in cold vapor mode. Under the optimized experimental conditions, the instrumental limits of detection (based on three times the standard deviation of 11 measurements of a blank solution) were around 0.02-0.04μg L-1, with linear dynamic ranges up to 15μgL-1. The interference of transition metals and the mechanism of the photo-CVG are briefly discussed. Real sample analysis using the photo-CVG-AFS method revealed that it was promising for water and geological analysis of ultralow levels of mercury.
Cold vapor generation, Mercury, Alcohol, Aldehyde, Carboxylic acid
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