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The use of paper‐based devices in combination with noninstrumental detection systems is becoming increasingly important in the analytical field due to its simplicity, rapidity, and low cost. However, their use for determination of volatile analyte derivatives is still relatively scarce. The present work reports on the assessment of a paper‐based gas‐sensing approach for the simultaneous noninstrumental...
This work reports on the development of a novel methodology for bromide determination by combining headspace single-drop microextraction with microvolume fluorospectrometry. The method lies in the in situ generation of bromine, transfer of the volatile to the headspace and trapping/reaction onto a fluorescein-containing aqueous drop exposed to the gas phase. The decrease in the fluorescence intensity...
The combination of liquid-phase microextraction and microvolume UV–vis spectrophotometry has been applied to the determination of iodate in natural water samples. The method is based on the reduction of iodate into vapor iodine and extraction of this volatile onto a single drop of N,N′-dimethylformamide.The following derivatization reaction was employed:IO 3− +5I − +6H + ...
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