University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Water

Classification: Water -> atmospheric

Citations 2

"Membrane-based Flow Injection System For Determination Of Sulfur(IV) In Atmospheric Water"
Environ. Sci. Technol. 1986 Volume 20, Issue 5 Pages 524-526
Purnendu K. Dasgupta and Vinay K. Gupta

Abstract: Atmospheric water was collected in buffered formaldehyde absorber solution (pH 4.8) and subjected to flow injection analysis. The sample was mixed with aqueous 50% NaOH in a passive cation-exchange membrane reactor and then mixed with pararosaniline - H2SO4 solution in a pressurized porous membrane reactor before determination by photometric detection at 580 nm. The limit of detection was 0.16 µM-S and up to 31 µM could be determined; the coefficient of variation was 2.5%.
Sulfur Ion exchange Spectrophotometry Membrane Reactor

"Fast Fluorimetric Flow Injection Analysis Of Formaldehyde In Atmospheric Water"
Environ. Sci. Technol. 1987 Volume 21, Issue 6 Pages 581-588
Shen Dong and Purnendu K. Dasgupta

Abstract: Atmospheric water was mixed with 0.1 M H2O2 (10 µL mL-1 of sample) and 10 µL of 1 M EDTA - 2 M NaOH was added. This carrier solution was then mixed with the fluorogenic reagent solution (2 M ammonium acetate, 0.25 M acetic acid and 0.1 M pentane-2,4-dione) in the flow injection analysis apparatus (details given). The solution was heated at 95°C for ~25 s and formaldehyde was determined fluorimetrically as 3,5-diacetyl-1,4-dihydrolutidine. The detection limit was 10 pmol of formaldehyde and response was rectilinear up to 100 µg l-1. The addition of H2O2 completely removed interference from S(IV). Various commonly occurring metal ions and anions did not interfere. The method was applied to the analysis of fogwater.
Formaldehyde Fluorescence Heated reaction Interferences