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Thread: Need help finding an expression related to chemical kinetics!

  1. #1
    Sep 2012

    Need help finding an expression related to chemical kinetics!

    Hello everyone,

    As a chemist, I can use some help related to curve fitting.

    Brief description of the problem:

    For the analysis of the kinetics of a particular chemical reaction I have obtained the curve as can be seen in the attachment. In this curve x represents time and y represents the decrease in concentration of a particular compound in solution.

    Now fur a full analysis I need an expression which can describe this behaviour.

    Normally, the behaviour in experiments like these can be described by a combination of exponential factors, for example:

    "f(x) = A exp(x/t1) + B exp(x/t2) + C exp(x/t3) + ..." etc. which fit nicely to the curve.

    In this case however the beginning of the curve behaves lineary and the end of the curve exponentially as if it is a combination of a pure 0th order decay and a 1st order decay.

    Where do I begin to try to find an expression for a curve like this?

    I am able to fit a curve using a standard polynomial expression "f(x) = A + A1*x + A2*x2 + A3*x3 + ..." but the 'oscillating' nature of the curve causes to many distortions when I eventually have to take

    the derivative of it.

    To summarize, is there a standard way where linear behaviour and exponential behaviour are combined in an expression which is able to describe the curvature in the attachment?


    Attached Thumbnails Attached Thumbnails Need help finding an expression related to chemical kinetics!-graph1.png  
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