A Fast, Simple Calibration Method for Organic Carbon Isotope Analysis Using Continuous-flow Elemental Analyzer Interfaced with an Isotope Ratio Mass

A Fast, Simple Calibration Method for Organic Carbon Isotope Analysis Using Continuous-flow Elemental Analyzer Interfaced with an Isotope Ratio Mass Spectrometer

Yeon-Sik BONG1) and Kwang-Sik LEE1)

1) Division of Isotope Geoscience, Korea Basic Science Institute

(Received July 9, 2007) (Accepted October 5, 2007)

Continuous flow analysis using an elemental analyzer interfaced with an isotope ratio mass spectrometer (EA-IRMS) is faster and requires much less material than conventional analytical methods. Although using an EA-IRMS is simple and fast, accurate calibration strongly depends on matching sample and reference peak heights by adjusting the sample weight. This paper describes a new modification for calibration using only the major ion beam intensity (nA) without weighing each sample or increasing the number of reference materials.

Anal. Sci., Vol. 23, p.1447, (2007)

A Rapid Sample Pretreatment Protocol: Improved Sensitivity in the Detection of a Low-abundant Serum Biomarker for Prostate Cancer

Mun'delanji VESTERGAARD1) and Eiichi TAMIYA2)

1) School of Material Science, Japan Advanced Institute of Science and Technology 2) Department of Applied Physics, Osaka University

(Received August 1, 2007) (Accepted October 23, 2007)

We have developed a rapid immunoglobulin G (IgG) and a human serum albumin (HSA) depletion protocol. We depleted both HSA and IgG (> 97%) separately, and in a single procedure. The method is specific and reproducible (RSD <>

Anal. Sci., Vol. 23, p.1443, (2007)

Analysis of a Quasi-Elastic Laser Scattering Spectrum Using the Maximum Entropy Method

Isao TSUYUMOTO1)

1) Department of Environmental Chemistry, Kanazawa Institute of Technology

(Received August 20, 2007) (Accepted October 15, 2007)

We have applied the maximum entropy method (MEM) to the analysis of quasi-elastic laser scattering (QELS) spectra and have established a technique for determining capillary wave frequencies with a higher time resolution than that of the conventional procedure. Although the QELS method has an advantage in time resolution over mechanical methods, it requires the averaging of at least 20 - 100 power spectra for determining capillary wave frequencies. We find that the MEM analysis markedly improves the S/N ratio of the power spectra, and that averaging the spectra is not necessary for determining the capillary wave frequency, i.e., it can be estimated from one power spectrum. The time resolution of the QELS attains the theoretical limit by using MEM analysis.

Anal. Sci., Vol. 23, p.1439, (2007)

Determination of Tin by Resin-Suspension Electrothermal Atomic Absorption Spectrometry after Enrichment as the Complex with Ammonium Pyrrolidinedithio

Determination of Tin by Resin-Suspension Electrothermal Atomic Absorption Spectrometry after Enrichment as the Complex with Ammonium Pyrrolidinedithiocarbamate

Masanori TARUKI1), Takeshi WAKUI1), Isoshi NUKATSUKA1) and Kunio OHZEKI1)

1) Department of Materials Science and Technology, Faculty of Science and Technology, Hirosaki University

(Received June 22, 2007) (Accepted October 4, 2007)

A resin-phase extraction method has been optimized for the trace determination of tin(II) by ETAAS. Tin(II) was extracted on a finely divided anion exchange resin as the complex with ammonium pyrrolidinedithiocarbamate (APDC). The resin was collected on a membrane filter and then dispersed in 1.00 ml of 1 mol l-1 nitric acid containing 100 µg of Pd(II) and 60 µg of Ni(II). The resulting resin suspension was subjected to GFAAS. The proposed method was applied to the determination of tin(II) in hydrochloric acid.

Anal. Sci., Vol. 23, p.1435, (2007)

Adsorption Behavior of Cationic and Anionic Species on Chitosan Resins Possessing Amino Acid Moieties

Koji OSHITA1), Toshio TAKAYANAGI2), Mitsuko OSHIMA2) and Shoji MOTOMIZU2)

1) Department of International Conservation Studies for Cultural Properties, Faculty of Cultural Properties, Kibi International University 2) Department of Chemistry, Faculty of Science, Okayama University

(Received August 27, 2007) (Accepted October 11, 2007)

Chitosan resins modified with amino acids, such as glycine, valine, leucine, and serine, were synthesized for investigating the adsorption behavior of cationic and anionic species, and showed good abilities for the adsorption of trace elements in aquatic media as follows: glycine for lanthanoids at pH 7, leucine for molybdenum at pH 1 - 5, serine for uranium at pH 2 - 7, and amino acids for bismuth at pH 1 - 7. Cationic and anionic species could be adsorbed by a chelating mechanism and an anion-exchange mechanism.

Anal. Sci., Vol. 23, p.1431, (2007)

Extraction Behavior and Separation of Lanthanides with a Diglycol Amic Acid Derivative and a Nitrogen-donor Ligand

Kojiro SHIMOJO1), Hirochika NAGANAWA1), Junji NORO2), Fukiko KUBOTA3) and Masahiro GOTO3)

1) Division of Environment and Radiation Sciences, Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency 2) Research Department, NISSAN ARC, LTD. 3) Department of Applied Chemistry, Graduate School of Engineering and Center for Future Chemistry, Kyushu University

(Received September 3, 2007) (Accepted October 24, 2007)

The extraction and separation of lanthanides have been investigated using CHON-type extractants, which are composed of only C, H, O, and N atoms. N,N-Dioctyldiglycol amic acid (DODGAA) showed high extraction and separation performances for heavier lanthanides compared with typical CHON-type extractants. On the other hand, N,N,N′,N′-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) provided an unprecedentedly high selectivity for lighter lanthanides. Furthermore, it was found that the combination of DODGAA and TPEN under suitable conditions enabled the mutual separation of light, middle, and heavy lanthanides.

Anal. Sci., Vol. 23, p.1427, (2007)

Electrochemical Determination of Nitrite Using a Gold Nanoparticles-modified Glassy Carbon Electrode Prepared by the Seed-mediated Growth Technique

Yanping CUI1), Changzhu YANG1), Wei ZENG1), Munetaka OYAMA2), Wenhong PU1) and Jingdong ZHANG1)

1) College of Environmental Science and Engineering, Huazhong University of Science and Technology 2) Division of Research Initiatives, International Innovation Center, Kyoto University

(Received May 15, 2007) (Accepted July 17, 2007)

Seed-mediated growth of gold nanoparticles on glassy carbon (GC) surfaces was developed. The field emission scanning electron microscopy (FE-SEM) and electrochemical characterization confirmed the effective attachment of gold nanoparticles on GC surface with such a wet-chemical method. The as-prepared gold nanoparticles attached glassy carbon electrode (Au/GCE) presented excellent catalytic ability toward the oxidation of nitrite. Compared with bare GCE and planar gold electrode, the Au/GCE obviously decreased the overpotential of nitrite oxidation and improved the peak current. The catalytic current was found to be linearly proportional to the nitrite concentration in the range of 1 × 10-5 - 5 × 10-3 M, with a detection limit of 2.4 × 10-6 M. The Au/GCE was successfully applied to the electrochemical determination of nitrite in a real wastewater sample, showing excellent stability and anti-interference ability.

Anal. Sci., Vol. 23, p.1421, (2007)