UPCOMING RESEARCH Application of Scanning Electrochemical Microscopy to Studies of Charge Propagation within Polyelectrolyte Coatings on Electrodes
Determination of Boron and Phosphorus in Borophosphosilicate Thin Films on Silicon Substrates by Capillary Electrophoresis
Protonated poly(4-vinylpyridine) coatings exhibit time dependency of redox conductivities with Fe(CN)|~ or IrCl§~ as counterions incorporated into the coatings. In contrast, responses obtained from Nafion coatings in which Os(bpy)i + is incorporated show no comparable time dependence. Π Cheol Jeon and Fred C. Anson*, Division of Chemistry and Chemical Engineering, Arthur Amos Noyes Laboratories, Cali fornia Institute of Technology, Pasadena, CA 91125
Results for boron with a n RSD of 0.6% and phosphorus with an RSD of 1.6% are attainable even though aqueous HF solutions are used in bare fused-silica capillaries. The advantages of this technique over ion chromatogra phy are demonstrated for analysis of the boron compo nent. Ronald A. Carpio* and Rene Mariscal, Sematech, 2706 Montopolis Drive, Austin, TX 78741 and John Welch, Waters, 2626 South Loop West, Houston, TX 77054
Mass Transfer in the Mobile and Stationary Phases in Micellar Liquid Chromatography
Fourier Analysis of Multicomponent Chromatograms. Recognition of Retention Patterns
Results with a series of solutes show that improvements in column efficiency when alcohols are added are attrib utable to mass transfer effects in the mobile phase. Renata Bailey and R. M. Cassidy*, Department of Chemistry, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 0W0
A procedure based on fitting t h e experimentally com puted autovariance function of multicomponent chro matograms to theoretical models is introduced. The sin gle-component interdistance model of retention times is tested, and t h e statistical attributes of the multicompo nent chromatogram are determined. Attila Felinger, Department of Analytical Chemistry, Univer sity of Veszprém, P.O. Box 158, H-8201 Veszprém, Hungary and Luisa Pasti and Francesco Dondi*, Department of Chemistry, University of Ferrara, via Luigi Borsari, 46, 1-44100 Ferrara, Italy
Increased Response of the Reversal Electron Attachment Detector and Modeling of Ion Space-Charge Effects The detection limit of the READ is lowered by a factor of 25 using a spherical electron emitter. Its response is ex plained in terms of negative ion-space charge. S. Boumsellek and A. Chutjian*, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 Time-of-Flight Mass Spectrometry with an Electrospray Ion Beam An electrospray ionization source is coupled to a reflectron TOF mass spectrometer. By orienting the ion source perpendicular to the field-free drift region, the longitudi nal energy spread of the ion packet is reduced, allowing a mass resolving power of more than 1000 to be achieved for low mass and high mass ions. James G. Boyle* and Craig M. Whitehouse, Analytica of Branford, Inc., 29 Business Park Drive, Branford, CT 06405 Near-Optimal Smoothing Using a Maximum Entropy Criterion A digital filter optimized by maximization of entropy, when applied to noisy, unknown data, yields signals equivalent to those obtained from t h e application of an optimal filter with prior knowledge of the true signal. Robert J. Larivee and Steven D. Brown*, Department of Chemistry, University of Delaware, Newark, DE 19716
Axial Introduction of Laser-Desorbed Ions into a Quadrupole Ion Trap Mass Spectrometer A fiber-optic interface allows laser desorption/ionization and axial introduction of biological molecules into a quadrupole ion trap mass spectrometer. Aubrey Mcintosh, Tracy Donovan, and Jennifer Brodbelt*, Department of Chemistry and Biochemistry, University of Texas, Austin, TX 78712-1167 Analysis of Antibodies and Other Large Glycoproteins in the Mass Range of 150,000-200,000 Da by Electrospray Ionization Mass Spectrometry Multiply charged ions (up to 150+) of macrosized glycoproteins are generated by pneumatically assisted electrospray (ionspray) a n d analyzed on a quadrupole mass spectrometer with a m/z range of 2400. Rong Feng* and Yasuo Konishi, National Research Council of Canada, Biotechnology Research Institute, 6100 Royalmount Avenue, Montreal, Quebec H4P 2R2, Canada
These articles are scheduled to appear in AC RESEARCH in the near future. C o r r e s p o n d i n g author ANALYTICAL CHEMISTRY, VOL. 64, NO. 17, SEPTEMBER 1, 1992 · 815 A
UPCOMING RESEARCH Determination of Boron in Light- and Heavy-Water Samples by Flow Injection Analysis with Indirect UV-Visible Spectrophotometric Detection
Emission Characteristics of a Pulsed, Radio-Frequency Glow Discharge Atomic Emission Device
An FIA method involving indirect UV detection of boron complexes formed between boric and chromotropic acids is developed. Precision is better than 3% over the 4 0 1 0 0 ^ g / L r a n g e a n d 1% for c o n c e n t r a t i o n s u p to 10,000 μg/L with a relative accuracy of 6%. The detection limit is 8 μg/L (SIN = 2), and t h e sample throughput is 15 samples per hour. Thérèse Lussier* and Roland Gilbert, Institut de Recherche d'Hydro-Québec, 1800 montée Sainte-Julie, Varennes, Québec, Canada J3X 1S1 and Joseph Hubert, Department de Chimie, Université de Montréal, P.O. Box 6128, Montréal, Québec, Canada H3C 3J7 Contribution to the Isolation and Characterization of Buckminsterfullerenes The carbon clusters C 6 0 , C 7 0 , and C 8 4 are extracted from soot samples and purified by LC. The mass spectra (laser desorption FT-MS) and UV-vis spectra of the fractions are discussed. Moustapha Diack, R. L. Hettich, R. N. Compton, and Georges Guiochon*, Department of Chemistry, The University of Tennessee, Knoxville, TN 37996-1501, Division of Analytical Chemistry, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6120, and Chemical Physics Section, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6125 Separation and Identification of Carotenoids and Their Oxidation Products in the Extracts of Human Plasma The separation and identification of 11 new carotenoids, as well as seven previously known carotenoids, from extracts of h u m a n plasma by HPLC are described. Several oxidation products of naturally occurring carotenoids are isolated a n d characterized among new plasma carotenoids. Frederick Khachik*, Gary R. Beecher, and Mudlagiri B. Goli, Nutrient Composition Laboratory, Beltsville Human Nutrition Center, Building 161 BARC-East, U.S. Department of Agriculture, ARS, Beltsville, MD 20705, William R. Lusby, Insect Neurobiology and Hormone Laboratory, Building 307 BARC-East, U.S. Department of Agriculture, ARS, Beltsville, MD 20705, and James C. Smith, Jr., Vitamin and Mineral Nutrition Laboratory, Beltsville Human Nutrition Research Laboratory, Building 307 BARC-East, U.S. Department of Agriculture, ARS, Beltsville, MD 20705 Characterization of Glucose Microsensors for Intracellular Measurements Glucose sensors with a 2-μπι structural tip diameter are developed by immobilization of glucose oxidase on plati nized carbon ring electrodes. These sensors have subsec ond response times and are used to monitor glucose tran sients in single cells. Takayuki Abe, Yau Yi Lau, and Andrew G. Ewing*, Depart ment of Chemistry, 152 Davey Laboratory, Penn State Univer sity, University Park, PA 16802
I n s t r u m e n t a t i o n , initial observations, and operating characteristics of a pulsed, rf glow discharge atomic emis sion source are described. Selective, gated detection of temporal emission intensity waveforms observed for some analyte transitions suggest possible analytical ad vantages in terms of instantaneous emission intensities. Michael R. Winchester and R. Kenneth Marcus*, Depart ment of Chemistry, Howard L. Hunter Chemical Laboratories, Clemson University, Clemson, SC 29634-1905 Determination of Inorganic Halogen Species by Liquid Chromatography with Inductively Coupled Argon Plasma Mass Spectrometry A method is developed for determining IO3, BrOâ, Cl~, CIO3 , Br", and Γ in drinking water, soup, and urine. De tection limits are 25 pg for I species, 0.8 ng for Br species, and 35 ng for CI species. Valeri V. Salov, Jun Yoshinaga, Yasuyuki Shibata, and Masatoshi Morita*, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305, Japan Temperature-Induced Phase Separation of Nonionic Polyoxyethylated Surfactant and Application to Extraction of Metal Thiocyanates Polyoxyethylene nonylphenyl ether facilitates the t r a n s fer of a countercation in the ion-pair extraction of thiocyanato complexes of transition metal ions into the pseudoorganic phase. Tetsuo Okada, Faculty of Liberal Arts, Shizuoka University, Shizuoka 422, Japan Water Monitoring System Based on Gas Extraction with a Single Hollow Fiber Membrane and Gas Chromatographic Cryotrapping A single hollow fiber membrane is used to quantitatively isolate volatile organic compounds from water in a sol vent-free extraction process. These compounds are di rectly introduced into the injector of a gas chromatograph, where they are cryofocused and analyzed. Katherine F. Pratt and Janusz Pawliszyn*, The GuelphWaterloo Center for Graduate Work in Chemistry and The Wa terloo Center for Groundwater Research, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1 Gas Extraction Kinetics of Volatile Organic Species from Water with a Hollow Fiber Membrane Mathematical descriptions of t h e solvent-free extraction process occurring in a hollow fiber membrane system are discussed and compared with experimental data. Condi tions required for exhaustive extractions and quantita tive analysis can be determined using the relationships developed in this work. Katherine F. Pratt and Janusz Pawliszyn*, The GuelphWaterloo Center for Graduate Work in Chemistry and The Wa terloo Center for Groundwater Research, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1
ANALYTICAL CHEMISTRY, VOL. 64, NO. 17, SEPTEMBER 1, 1992 · 817 A
