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Rank Annihilation Factor Analysis for Kinetics Spectrophotometric Mixture Analysis.

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Presentation on theme: "Rank Annihilation Factor Analysis for Kinetics Spectrophotometric Mixture Analysis."— Presentation transcript:

1 Rank Annihilation Factor Analysis for Kinetics Spectrophotometric Mixture Analysis

2 A P 1 k1k1 B P 2 k2k2 [A]=[A] 0 exp(-k 1 t) [P 1 ]=[A] 0 (1-exp(-k 1 t)) [B]=[B] 0 exp(-k 2 t) [P 2 ]=[B] 0 (1-exp(-k 2 t))

3 Rank Annihilation Factor Analysis for Kinetics Spectrophotometric Mixture Analysis

4 Spectrophotometric monitoring of pH-metric titration of mixture of metal ions and an acidic ligand Rank=3 [A] 0 =1 [B] 0’ =1.4 Rank=2 Unknown sample A P 1 k1k1 B P 2 k1k1 Standard sample A P 1 k1k1 [A] 0 =1 [B] 0’ =0

5 Rank=3Rank=2 - Rank Annihilation Factor Analysis

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11 ? Use RAFA for a mixture analysis based on kinetic spectrophotometric measurements

12 Simulation of two parallel first order reaction

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19 Three are some problems in using RAFA for mixture analysis based on kinetic measurements

20 A + R P k k= 0.1 Second order reactions

21 Rank Analysis

22 Product concentration ratio A + R P k [A] 0 =1 [R] 0 =2 [A] 0 =0.5 [R] 0 =2 Analyte concentration ratio

23 Rank Annihilation Factor Analysis for Kinetics and Equilibria Study

24 [A] =[A] 0 exp(-k 1 t) [B] = [ exp(-k 1 t) - exp(-k 2 t) ] k 2 – k 1 [A] 0 k 1 [C] =[A] 0 - [B] - [A] A B C k1k1 k2k2 Consecutive Reaction:

25 D = (X A + X B + X C ) + E = (c A s A T + c B s B T + c C s C T ) + E DXAXA XBXB XCXC = ++ = ++ cAcA sATsAT cBcB sBTsBT cCcC sCTsCT D = C STST

26 R = D - X A = D - c A s A T The aim of RAFA is to find a suitable k 1 so that the rank of matrix F can be reduced by 1 from that of matrix Y through introduction of kinetic spectrum of species A DR C -A S -A T =- = XAXA cAcA sATsAT

27 Determination of rate constants of a consecutive reaction with known spectrum of reactant sAsA D R = D - X A = D - c A s A T c A =f (k 1 )

28 rafa_k.m Determination of rate constants of a consecutive reaction with known spectrum of reactant

29 Calling function rafa_k

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32 k1k1 k2k2

33 Free study Why both rate constants can be calculated by removing only the reactant component Anal. Chim. Acta 454, 21-30, 2002

34 ? Use rafa_k function for determination of rate constants for a consecutive reaction

35 consecutive.m file Creating the consecutive reaction kinetic model

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40 Determination of rate constants of a consecutive reaction with known spectrum of product sCsC D R = D - X C = D - c C s C T c C =f (k 1,k 2 )

41 rafa_k2.m Determination of rate constants of a consecutive reaction with known spectrum of product

42 Calling function rafa_k2

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48 ? Use rafa_k2 function for determination of rate constants for a consecutive reaction with spectral rank deficiency

49 Second order kinetics and RAFA

50 A + B C k [A] + [C] = [A] 0 [B] + [C] = [B] 0 [B] 0 =  [A] 0 [B] + [C] =  [A] +  [C]  [A] - [B] + (  [C] = 0 Rank deficiency in concentration profiles Linear dependency

51 D = (X A + X B + X C ) + E = (c A s A T + c B s B T + c C s C T ) + E DXAXA XBXB XCXC = ++ = ++ cAcA sATsAT cBcB sBTsBT cCcC sCTsCT D = C STST

52 R = D - X A = D - c A s A T For correct k value DR C -A S -A T =- = XAXA cAcA sATsAT Rank® = 2 For incorrect k value DR C -A S -A T =- = XAXA cAcA sATsAT Rank® = 3Rank® = 2

53 Determination of rate constants of a second-order reaction with known spectrum of reactant sAsA D R = D - X A = D - c A s A T c A =f (k)

54 rafa_ks.m Determination of rate constants of a second-order reaction with known spectrum of reactant

55 Calling function rafa_ks

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59 ? Is it possible full resolving the second-order kinetic systems with RAFA?

60 ? Use rafa_ks.m file and investigate in which rank deficient cases the k value of second-order reaction can be calculated with RAFA. i) s A = s B ii) s A = s C iii) s B = s C

61 second.m file Creating the second-order reaction kinetic model

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