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Relationships between Water Quality Constituents in the Delta and the Influence of Different Sources of Water
Richard A. Denton and Paul Hutton

Analysis of detailed grab sample data from San Francisco Bay and Delta and development of regression relationships between EC, TDS and water quality constituents such as chloride, bromide, sodium, calcium, sulfate, alkalinity and hardness. The relationships in the interior Delta vary depending upon the percentage contributions from seawater, agricultural drainage and freshwater inflows.

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Leveraging CI-H Mass Defect Plots for the Identification of Halogenated Organic Contaminants
Jonathan D. Byer, Mehran Alaee, Karl Jobst, Grazina Pacepavicius, Joe Binkley

A number of legacy contaminants and other pesticides, as well as a number of previously unknown compounds were tentatively identified in the pooled sample. Cl-H mass defect plots are a useful tool for filtering through complex data for the identification of halogenated contaminants. This technique functions as a screening tool for the identification of unknowns, and in the future, may be used as a form of fingerprinting to compare samples.

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Flash Pyrolysis Coupled to GCxGC-TOFMS and GC-High Resolution TOFMS for Characterization of Crude Oil and Petroleum Fractions
Clecio F. Klitzke, Joe Binkley, Jeffrey Patrick

The pyrolysis of asphaltenes from discrete crude oil samples shows distinct composition in terms of light and heavy aromatic hydrocarbons and alkyldibenzo-thiophenes. The use of Py–GC×GC–TOFMS is crucial for the determination of isomeric composition, and Py–GC–HRTOFMS with high resolution and high mass accuracy complements the identification by unequivocal chemical formula assignments. The study of the relationships of the crude oil and asphaltene composition are in progress.

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Microextraction techniques combined with X-ray fluorescence spectrometry for determination of different metal ions in water
Karina Kocot (a), Beata Zawisza (a), Eva Marguí (b), Ignasi Queralt (c), Rafal Sitko (a)

In present work new preconcentration procedures combining microextraction techniques and X-ray fluorescence spectroscopy were developed. Proposed methodologies are promising tools for multielemental analysis enabling detection of natural pollutants in different water samples.

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Effects of aquaculture effluents on nitrogen characteristics in two Chinese estuaries
David Kaiser, Lucia S. Herbeck

The poster describes similarities and differences of the effects aquaculture effluents have on the nitrogen composition in estuarine waters of two sites in southern China

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APPLICATION OF LIQUID CHROMATOGRAPHY WITH UV DETECTION FOR DETERMINATION OF PLANT GROWTH REGULATOR IN COMMON PLANT FERTILIZERS
Borowczyk K., Wyszczelska-Rokiel M., Stachniuk J., Chwatko G., Glowacki R.

1. The methodology allows facile and accurate determination of IBA in common plant fertilizer samples.
2. The analytical figures of linearity, precision and recovery shown during the method validation procedure are well within the criteria for biological sample analysis.
3. In temperature -18, 4 and 25 °C the analyte stays stable for 6 h.
4. The assay should help in control of phytohormones concentration in plants and fertilizers.

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Examination of Pesticide Residues in Wine, Beer and Their Constituent Products Using High-Throughput Techniques to Maximize Extraction & Efficiency
Patricia Atkins, Matt Snyder

In this study, commercial red wine and beer samples were examined for their pesticide concentrations.

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MS Data Processing With Full Flexibility Of Universal Processing Software
Frans Schoutsen, Barbara van Cann, Vincent Jespers, Michal Godula

Liquid Chromatography (LC) in combination with triple quadrupole Mass Spectrometry (MS) is more and more a common analysis technique in routine laboratories. Especially when using MS/MS selected reaction monitoring (SRM) for a large number of components data handling can be a bottle neck. This poster will show MS data processing of pesticides in water samples using an already established chromatography data system which is now also capable of processing large quantities of MS data.

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Identifying Unknown Chemicals and Disinfection Byproducts in Swimming Pools and Hot Tubs
Jonathan D. Byer, Susan D. Richardson, Eric J. Daiber, Sridevi Anduri Chowdary, Joe Binkley, Jeff Patrick

DBPs were identified in finished water, tap water, swimming pool water, and hot tub water that were not present in the source water. High Resolution Deconvolution was used effectively to identify a greater number of peaks in the chromatogram than by nominal resolution MS.

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Showing Results 21 - 30 of 62
Scientific News
Battery Component Found to Harm Key Soil Microorganism
The material at the heart of the lithium ion batteries that power electric vehicles, laptop computers and smartphones has been shown to impair a key soil bacterium, according to new research.
Living a “Mixotrophic” Lifestyle
Some tiny plankton may have big effect on ocean’s carbon storage.
Living a “Mixotrophic” Lifestyle
Some tiny plankton may have big effect on ocean’s carbon storage.
Toxic Pollutants Found in Fish Across the World's Oceans
Scripps researchers' analysis shows highly variable pollutant concentrations in fish meat.
Global Nitrogen Footprint Mapped
Four countries cause almost half the world’s emissions, with developing countries tending to suffer local pollution caused by foreign demand.
Environmental Toxin May Increase Risk of Alzheimer's
First time scientists have observed brain tangles in an animal model through exposure to environmental toxin.
Global Ocean Warming has Doubled in Recent Decades
Lawrence Livermore scientists, working with National Oceanic and Atmospheric Administration and university colleagues, have found that half of the global ocean heat content increase since 1865 has occurred over the past two decades.
Single Molecule Detection of Contaminants, Explosives or Diseases
A technique that combines the ultrasensitivity of surface-enhanced Raman scattering (SERS) with a slippery surface invented by Penn State researchers will make it feasible to detect single molecules of a number of chemical and biological species from gaseous, liquid or solid samples.
Super-Fine Solution to Sponge Up Micropollutants
A super-fine form of powdered activated carbon captures micropollutants more rapidly than the conventional kind and could by used in Swiss wastewater treatment plants, say EPFL researchers in a new study.
Cleaning Wastewater with Pond Scum
A blob of algae scooped from a fountain on South Street almost two years ago, has seeded a crop of the green stuff that Drexel University researchers claim is more effective at treating wastewater than many of the processes employed in municipal facilities today.
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