Abstract
Some recent analytical sensors based on electrochemical and optical detectioncoupled with different flow techniques have been chosen in this overview. A briefdescription of fundamental concepts and applications of each flow technique, such as flowinjection analysis (FIA), sequential injection analysis (SIA), all injection analysis (AIA),batch injection analysis (BIA), multicommutated FIA (MCFIA), multisyringe FIA(MSFIA), and multipumped FIA (MPFIA) were reviewed.
Highlights
Microprocessorcontrolled electronic pipettors can be used as liquid propulsion devices instead of conventional oversized peristaltic pumps. This system can be operated in three different modes similar to flow injection analysis (FIA), sequential injection analysis (SIA), and direct injection analysis (DIA)
Spectrophotometry is widely used as the detection technique for the flow injection, sequential injection, multicommutated FIA (MCFIA), multisyringe FIA (MSFIA), and SI-LOV for the on-line determination of either inorganic or organic species in a wide range of applications
This study focused on the influence of surfactants on the native fluorescence of asulam, as an effect of ultraviolet irradiation on the fluorescence of asulam by forming photo-fragments with high intensities
Summary
Chemical flow-based analysis was first introduced in the middle of 20th century [1]. This technique has been developed from an attempt to collect the fractions eluted in the chromatographic separation process in an industrial plant. The great advantage of this technique is an important saving in the samples and reagents, whereas a low analysis rate and complicated software, including an expensive instrument setup are the main drawbacks Another approach, BIA, is conceptually similar to FIA in that the injected sample zone is transported toward the detector. A small liquid sample is injected toward the nearby flat sensor surface resulting in a transient signal similar to those in the FIA readout This technique is considered a “non-flow injection-based technique” from the fact that no transport of either sample or reagents takes place within the tubing, it has been demonstrated to be a very attractive approach for automation analysis. In the two sections, we will briefly review flow-based electrochemical detection and flowbased optical detection
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