Monterey concentrations

Kenneth Johnson is a Senior Scientist at the Monterey Bay Aquarium Research Institute. His research interests are focused on the development of new analytical methods for chemicals in seawater and application of these tools to studies of chemical cycling throughout the ocean. His group has developed a variety of analytical methods for analyzing metals present at ultratrace concentrations in seawater. His expertise lies in trace metal analysis and instrumentation. The creation of reference materials to calibrate these instruments is important for the production of long-term, high-precision datasets. Dr. Johnson has participated on the NRC Committee on Marine Environmental Monitoring and the Marine Chemistry Study Panel. 

Whitfieid, M. (2001). Advances in Man ne Biology 41, 3-128 and Bruiand, K. W. (1983). Chemical Oceangraphy, Academic Press, pp. 157-220. Concentrations from MBARi Chemicai Sensor Program, Monterey Bay Aquarium Research institute. Periodic Tabie of Eiements in the Ocean, (http //www.mbari.org/chemsensor/summary.htmi) accessed Juiy 2008. 

Separation methods. Extraction and fractionation (Figure 1) methods have been described elsewhere (16). The kerogen from Jurf ed Darawish-156 was concentrated by decarbonating the extracted whole rock followed by reextraction. The kerogen from the Monterey-25 was fully isolated using standard HC1/HF techniques. Asphaltene fractions were obtained and purified from bitumens by repeated precipitations with n-heptane. 

Broyles, B.S., Jacobson, S.C., Ramsey, J.M., Sample concentration and separation on microchips. Micro Total Analysis Systems, Proceedings 5th ytTAS Symposium, Monterey, CA, Oct. 21-25, 2001, 537-538. 

Comparison of analyses of heptane insolubles from the liquefaction of Monterey bituminous and Wyodak subbituminous coals in the hydrogen-enriched solvent shows that carbon, hydrogen and oxygen concentrations converge with increasing reaction severity to form a product with similar elemental analyses. The same convergence is seen when the hydrogen-depleted solvent is used. 

A series of four fuels were burned in the Charleston boiler including the RSFO that was being used as the boiler fuel, and three fuels from the ECLP pilot plant. These EDS fuels were derived from the operation on Monterey No. 6 mine coal and included the solvent, a blend of 22 wt. % VG0/78 wt. % solvent, and a blend of 35 wt. % VG0/65 wt. % solvent. The three EDS fuels were chosen to span a range of PNA concentrations. 

Representative and spectra are presented in Figures 5, 6, 7, and 8 for the Amax and Monterey samples. The quantitative reference (peak at 0.0 ppm) in each spectrum is hexamethyldisiloxane ((CH3)3-Si-0-Si(0113)3). A paramagnetic relaxation reagent (the paramagnetic relaxation reagents used were either tris(acetylacetonato) iron (III), Fe(acac)3, or tris(acetylacetonato) chromium (III), Cr(acac)3 at concentrations of 2-6 X lO M). was added to decrease spin lattice relaxation times (Ti s) and suppress nuclear Overhauser effects (5). In addition,... 

Figure 4 Correlations of with (a) surfactant concentration, (b) in situ chlorophyll fluorescence, (c) dissolved organic carbon (DOC), and (d) colored dissolved organic matter (CDOM) for seawater samples collected from Monterey Bay, USA ( ) and on a transect from Narragansett USA to Bermuda ( ) (Frew, 1997) (reproduced by permission of Cambridge University Press from The Sea Surface and Global Change, 1997, pp. 121-172).

The reductive step of the Sternberg procedure actually produces a resonance with a g value higher than that of the starting coal, suggesting possible increased influence of oxygen in the resultant radical ensemble. The top absorption spectrum is of an aliquot removed during reduction and shows the presence of the naphthalene anion. The middle spectrum is of a filtered, reduced Monterey coal (spin density of 7 X 20 spins g). The bottom spectrum was obtained following butyl iodide addition. Spectra are 40 G in width but not concentric in g value. (Potassium was used in these examples.)... 

Santos FJ, Galceran MT (2002) Trends Anal Chem 21 672 Morvan M, Talon T, Beziau J-F (2003) Sens Actuators B 95 212 Li YY, Wu P-C, Su H-J, Chou P-C, Chiang CM (2002) Effects of HVAC ventilation efficiency on the concentrations of formaldehyde and total volatile organic compounds in office buildings. Proceedings of the 9th international conference on indoor air quality and climate. Monterey, CA, USA, p 376... 

To this end, loop-based injection is preferred and the sample aspiration tube (Fig. 6.9) behaves as a sampling probe, as demonstrated in the landmark work of Thomsen et al. who determined reactive silicate in coastal waters during a cruise from Monterey Bay to San Francisco Bay in the USA [3]. The sample was continuously aspirated from a water layer about 2 m below the sea surface and a situation of "infinite sample volume" was attained in the main channel of a shipboard reagent injection (reversed flow) flow injection system. A reagent aliquot was injected into the flowing sample every 45 s and the resulting coloured zone was quantified by spectrophotometry. The height of the recorded peak was directly related to the reactive silicate concentration at the specified location and depth. 

FIGURE 17.17 CCN closure study carried out during July 2003 in the Pacific Ocean marine boundary layer off the coast of Monterey, California. A CCN counter on board an aircraft measured activation of the boundary layer aerosol at 3 supersaturations data for 0.1% supersaturation are shown here. Panels (a) and (b) show data when the airmasses sampled were of marine and continental origins, respectively. The predicted CCN concentrations are based on the assumption that the aerosol was pure ammonium sulfate. Source California Institute of Technology... 

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