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Saturday, November 22, 2014
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METHOD DEVELOPMENT FOR THE SIMULTANEOUS DETERMINATION OF METHYLMERCURY AND INORGANIC MERCURY IN SEAFOOD
Sergio Carneado, Ariane V. Zmozinski, Carmen Ibáñez-Palomino, Àngels Sahuquillo, José Fermín López-Sánchez, Márcia M. da Silva

This work reports the method development for the simultaneous determination of methylmercury (MeHg+) and inorganic mercury (iHg) species in seafood. The study focused on the extraction and quantification of MeHg+ by liquid chromatography coupled to on-line UV irradiation and cold vapour atomic fluorescence spectroscopy (LC-UV-HG-AFS), using HCl 4 mol L-1 as extractant agent.

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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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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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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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Automated, Rapid And Reliable Determination Of Dissolved Gases In Water By Static Headspace – Gas Chromatography
A. Caruso, M. Santoro, F. Bedini, P. Magni, S. Pelagatti

Purpose: Exploring the possibility to perform a quantitative determination of dissolved gases in water in a reliable and accurate way. Methods: The quantification of dissolved gases is performed by building a calibration curve spiking blank water samples with increasing quantities of saturated water followed by headspace sampling and GC/ FID analysis. Results: The results show good correlation factors and limit of quantification lower than 10ppb for the four gas analyzed.

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GC-MS Comparison of Lavindin Grosso Oil Obtained by Steam Distillation and SFE
Claudia Worley, Lisa Zona, Susan Sonchik Marine

Oil was extracted from Lavindin Grosso using steam distillation and using supercritical fluid extraction (SFE). Multiple analyses of the same extract demonstrated repeatability of the analytical method. The variability between batches of distillate bracketed the composition obtained by SFE. The differences among the oils could be attributed more to where the lavender was grown than to the extraction method.

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Cloud Point Extraction of Metal Oxide Nanoparticles in Water Samples Identified by Raman Spectroscopy and Quantified by Atomic Absorption Spectroscopy
Yanxiao Ma, Dr. Andrew F. Callender

Nanoparticles that are widely used in commercial products pose a threat to human health and the environment. This project proposes a cheaper and more effective method to identify and quantify metal oxide nanoparticles in water samples.

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Cloud Point Extraction of Metal Oxide Nanoparticles in Water Samples Identified by Raman Spectroscopy and Quantified by Atomic Absorption Spectroscopy
Yanxiao Ma, Dr. Andrew F. Callender

Nanoparticles that are widely used in commercial products pose a threat to human health and the environment. This project proposes a cheaper and more effective method to identify and quantify metal oxide nanoparticles in water samples.

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Showing Results 1 - 10 of 30
Scientific News
Stanford Engineers Discover How to Record the Forensic History of Chemical Contaminations in Water
An invention called a time capsule is a tiny chemistry lab designed to take a fingerprint of contamination and also disclose when it occurred.
New Process Transforms Wood, Crop Waste into Valuable Chemicals
Scientists disclosed a new method to convert lignin, a biomass waste product, into simple chemicals.
Mass Spec Sample Prep Cut From Days to Minutes
The method, developed by Livermore scientists, accommodates liquid samples and bypasses the graphitization process, enabling sample preparation and analysis in minutes.
Pilot Study Reveals New Findings About Microplastics in Wastewater
The findings demonstrate that treatment plants cannot keep microplastics out of wastewater by conventional means.
Drinking Water Odors, Chemicals Above Health Standards Caused by 'Green Building' Plumbing
Several types of plastic pipes in eco-friendly green buildings in the United States have been found to leach chemicals into drinking water that can cause odors and sometimes exist at levels that may exceed health standards.
Unique Catalysts for Hydrogen Fuel Cells Synthesized in Ordinary Kitchen Microwave Oven
Researchers show how a unique nano-alloy creates a new type of catalysts for highly efficient oxygen reduction.
Nanoparticles Accumulate Quickly in Wetland Sediment
Aquatic food chains might be harmed by molecules "piggybacking" on carbon nanoparticles.
Detecting Pharmaceutical and Personal Care Products in Water
A simple, more convenient method than conventional guidelines.
How to Make Stronger, “Greener” Cement
Analysis of material’s molecular structure leads to a new formula that could cut greenhouse-gas emissions.
Mass Spectrometry in Your Hand
Electrospray arrays can dramatically downsize systems and costs for onsite chemical analysis and many other applications.
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