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A reversed-phase ion-pair HPLC with indirect photometric detection for the simultaneous determination of sulfite, sulfate, hydroxymethanesulfonate (HMS), and other inorganic anions in atmospheric water has been developed. Separations were accomplished in less than 10 min in a cetylpyridinium-coated C 18 column with 0.5 mM potassium hydrogen phthalate-0.015% triethanolamine-3% methanol...
A multicommutation-based method has been developed for the on-line direct atomic fluorescence spectrometric (AFS) determination of Hg in waters without any previous sample treatment. The performance of the proposed procedure has been compared with that of a conventional AFS system based on continuous mode measurements. In short, the use of multicommutation, together with a reduction of the size of...
This paper summarizes the most relevant manuscripts issued from 1990 to date referred to water analysis using flowing stream techniques. Concretely, reported flow methods applied to the determination or monitoring of inorganic analytes (viz. carbon, nitrogen, phosphorous and silicon species) together with some related compounds to assess water quality in drinking, rain, underground, marine, river,...
The performance of commercially available microtiter plate enzyme-linked immunosorbent assays (ELISA) kits specific for the determination of triazines (atrazine), chlorpyrifos, and diazinon was evaluated for sensitivity, intra-assay repeatability, and accuracy using samples of known concentration in aqueous solution. Mean percent recovery values were not significantly different among concentrations...
Thermoresponsive polymers, poly(N-isopropylacrylamide) (PNIPAAm), having chelating functionalities were synthesized. PNIPAAm-imidazole (-Im) was precipitated and formed a gum-like aggregate in the neutral pH region at 50 o C, while PNIPAAm-carboxylic acid ( COOH) and PNIPAAm-iminodiacetic acid (-IDA) remained soluble even at pH 7. An addition of a paired ion, dodecyltrimethylammonium ion,...
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