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Determination of Tributyltin in Tissues and Sediments by Graphite Furnace Atomic Absorption Spectrometry 696 Recoveries of spiked samples range from 72% to 111%. The sample detection limit (twice the standard deviation of the sample blank) is 0.0025 μ% of tributyltin per gram. Mark D. Stephenson* and Donald R. Smith, Moss Landing Ma rine Laboratories, California Department of Fish and Game, Moss Landing, Calif. 95039 Anal. Chem., 60 (1988) In Situ Fluorescence Detection of Polycyclic Aromatic Hydrocarbons following Preconcentration on Alkylated Silica Adsorbents 698 Preconcentration factors can be predicted from chromato graphic retention theory. Detection limits for pyrene are lowered by factors of 200 relative to solution-phase measure ments to sub-parts-per-trillion levels. J. W. Carr and J. M. Harris*, Department of Chemistry, Universi ty of Utah, Salt Lake City, Utah 84112 Anal. Chem., 60 (1988) Effects of Helium Addition to an Argon Glow Discharge Plasma on Emission Lines of Sputtered Particles 702 Intensity enhancement of emission lines from the sputtered particles is reported when an Ar-He gas mixture is used in Grimm-type glow discharge spectrometry. Kazuaki Wagatsuma* and Kichinosuke Hirokawa, Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980, Japan Anal. Chem., 60 (1988) Factors Affecting the Sampling of Poly(ethylenimines) by Electrohydrodynamic Mass Spectrometry
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430 A · ANALYTICAL CHEMISTRY, VOL. 60, NO. 7, APRIL 1, 1988
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The effects of adding acid and transition metal ions indicate that sampling bias in EHMS is attributable to both strong solvent-ion interactions resulting from poor shielding of charge sites in multiply charged adducts and hydrogen bonding interactions between polymer and solvent. In creases in apparent average molecular weight when PEIs are sampled from mixed glycerol-water matrices result from changes in hydrogen bonding, ion pairing, or mass transport. Kelsey D. Cook*, John H. Callahan, and Victor F. Man, Depart ment of Chemistry, University of Tennessee, Knoxville, Tenn. 37996-1600 Anal. Chem., 60 (1988) Glycerol-lnduced Reduction in Electrohydrodynamic Mass Spectrometry 714 Glycerol can chemically reduce transition metals and a diquaternary ammonium salt. E° is near 0.1 V (vs. NHE). This may account for some reduction reported in matrix-assisted bombardment ionization mass spectrometry. John H. Callahan, Kevin Hool, Johnny D. Reynolds, and Kelsey D. Cook*, Department of Chemistry, University of Tennessee, Knoxville, Tenn. 37996-1600 Anal. Chem., 60 (1988)
