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- W2022752304 abstract "Abstract A highly automated, chemically inert, stopped-flow mixing system for rapid kinetic determinations is described. The reactant solutions are drawn into the drive syringes through novel double check valves, which are an integral part of the syringe block. The prime movers for the flow systems are pneumatic cylinders driven by compressed air; air flow is controlled by electromechanical valves actuated by optically isolated zero-crossing switches. The dead time of the flow system is 2–3 ms, depending on the drive pressure. The spectrophotometric detection system consists fo a high-intensity light source, a wavelength selector and a reference detector that are mechanically isolated from the flow system by a quartz fiber-optic light guide. The transducers are solid-state photodiodes. The sample photodiode is mounted adjacent to the output window of the cell to minimize light losses. The signal-to-noise ratio of the photometric system is from 2×102 to greater than 4×4, depending on wavelength, absorbance level, and amount of signal averaging. The reduction of Fe(CN)63− by ascorbic acid was used as a test reaction. Accuracy and precision better than 0.3% were obtained for routine determination. A detection limit of 4.10×10−7 M Fe(CN)63−, or 134 μg kg−1 K3Fe(CN)6, was found for this system." @default.
- W2022752304 created "2016-06-24" @default.
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- W2022752304 date "1989-01-01" @default.
- W2022752304 modified "2023-09-26" @default.
- W2022752304 title "High-precision stopped-flow mixer for kinetic determinations" @default.
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- W2022752304 doi "https://doi.org/10.1016/s0003-2670(00)86560-5" @default.
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