| In recent years, the nonlinear phenomena have more and more been recognizedand the oscillating chemical reactions, as one of the most important nonlinearphenomenon in chemical systems, have also been widely investigated. And themechanisms of the classical chemical oscillating systems seemed to get moreexpressly. Due to some advantages, such as simpleness in set-up, convenience ofoperation, widely linear range and lower detection limit, many analysts also have paidtheir attention to analytical applications of chemical oscillating reactions. In this paper,phenylalanine was determined in an alkaline system catalyzed by Cu（Ⅱ） and thedetermination of INAH by using non-equilibrium stationary state in the B-Zoscillating chemical system was proposed. At the same time, the perturbation ofRhodamine B on a Mn（Ⅱ）-catalyzed system which glucose involved was alsodiscussed.This part reviewed the progress and the conditions of oscillating chemicalreactions. The classifications of chemical oscillating systems were discussed. At thesame time, the application of oscillating systems in analytical determination was alsodiscussed. Finally, the perspective of chemical oscillation reactions was describedsimply.The effects of D-and L-phenylalanine on the Cu（Ⅱ）-catalyzed oscillatingchemical reaction in an alkaline medium is investigated in this paper. The resultsshowed that the changes of amplitude （ΔA） after adding D-and L-phenylalanine weredifferent. The changes of the amplitude were linearly proportional to the negativelogarithm concentration of D-phenylalanine in range of1.80×10-91.40×10-4mol/L（r=0.9963） with detection limit （LOD） of2.69×10-11mol/L, and forL-phenylalanine in range of1.80×10-61.80×10-4mol/L （r=0.9958） with detectionlimit of2.61×10-7mol/L. The proposed method was successfully used fordetermination of L-phenylalanine in beverage and simulating water sample. Thepossible reaction mechanism was also discussed.The effects of INAH on both the regular oscillating state and the non-equilibriumstationary state of the B-Z reaction were investigated in this paper. The results showedthat the non-equilibrium stationary state was more sensitive to INAH than the regular oscillating state, and the detection limit was down to6.76×10-9mol/L. In addition,INAH in tablet was detected by the proposed method and the results was consistentwith which obtained by the method in pharmacopoeia.An approach using a double organic substrate oscillating system ofglucose-acetone-Mn（Ⅱ）-KBrO3-H2SO4to perform the chiral separation anddetermination of Rhodamine B was made. The results showed that when theconcentration of Rhodamine B was in range of8.8×10-87.9×10-5mol/L, the changesof the oscillating amplitude were proportional to the negative logarithm of theirconcentrations. The detection limit was down to9.33×10-9mol/L. It was a newmethod to detect Rhodamine B in food. |
PDF Full Text Request