Use of extraction disks for tracer enrichment of various pesticides from river water and simulated seawater samples followed by liquid chromatography-rapid scanning UV-visible and thermospray-mass spectrometry detection

Article Abstract:

A preconcentration method based on physicochemical principles for the identification and quantitation of pesticides in water matrices is discussed. Several pesticides, atrazine metabolites, organophosphorous, phenylurea, propioanilide and carbamate were isolated from river water and simulated seawater and trace enriched. Liquid chromatography with rapid-scanning UV-visible spectrometry was used to determine the recoveries of pesticides and atrazine metabolites. The advantages of the combination of the extraction disks with the spectrometry technique used were demonstrated.

Methods, Evaluation, Pesticides, Water analysis, Trace pollutants, Extraction apparatus

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Similarities in the chemical composition fo carbonate groundwaters and seawater

Article Abstract:

An analysis of chemical elements in spring water flowing through carbonate rock in Ash Meadows in southern Nevada and Death Valley, California showed that the chemical concentrations of trace elements followed the similar concentrations in seawater, both ancient and present. One possible explanation for the similarity in chemical concentration between spring water and ancient seawater is the rainfall theory, where rainfall deposited the trace elements on the carbonate rock, providing a record of ancient seawater chemical composition.

Water, Underground, Groundwater, Sea-water, Seawater

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Characterization of individual particles in the North Sea surface microlayer and underlying seawater: comparison with atmospheric particles

Article Abstract:

The chemical characterization and specific particle type specification of analyzed particles in the microlayer and the underlying bulk water are discussed. Electron probe x-ray microanalysis and laser microprobe mass analysis were used on five pairs of North Sea bulk waters and their corresponding surface microlayer samples. Results were compared with atmospheric and riverine particle data. Data from both environments exhibited similar particle abundances.

Research, Usage, Ocean-atmosphere interaction, Ocean, Oceans, North Sea

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