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Title: A Simple Stopped-flow System for Kinetic Study of Arsenate-molybdenum Blue Reaction
Authors: Pipoon Bunpeng
Ponlayuth Sooksamiti
Somchai Lapanantnoppakhun
Jaroon Jakmunee
Keywords: arsenate
molybdenum blue
stopped flow injection
kinetic study
initial rate
Issue Date: 2020
Publisher: Faculty of Science, Chiang Mai University
Citation: Chiang Mai Journal of Science 47,5 (Sep 2020), p.1044-1054
Abstract: A low-cost stopped-flow spectrophotometric system was fabricated in the laboratory for a kinetic study on the reaction of molybdenum blue with arsenate. The influence of the concentration of the reagents on the rate of reaction has been studied. Arsenate and reagent solutions were flowed to mix together in-line, and the mixed zone was stopped at a flow cell where the absorbance at 880nm was continuously recorded. The initial slope of the stopped-flow profile was evaluated as an initial rate of the reaction, and then the order of reaction and rate law equation were derived. The following reaction rate equation: Rate = k[As(V)]2 [Mo]3 [PAT]1 [AA]1[H2SO4]-7 was obtained. This kinetic data could be used to suggest on the influencing of reactants to the reaction rate. The proposed system provided reproducible and accurate kinetic profile, convenient and fast operation, and low chemical consumption. The developed method is a suitable platform for the kinetic study of the reaction.
Description: The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.
ISSN: 2465-3845
Appears in Collections:CMUL: Journal Articles

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