| Part 1. Multiple steady states and oscillating chemical reactionThis paper described multiple steady states, presented the relationship between which and oscillating chemical reaction, and introduced the application of oscillating chemical reaction to analytical chemistry. Then, the research progress was summarized and the future of this method was looked into.Part 2. Determination of trace amounts of mercury ion by using iodide modified B-Z oscillating chemical systemA highly sensitive method for determination of trace amounts of mercury ion by using iodide modified B-Z oscillating chemical system was proposed. The optimum conditions for determination were also discussed. Results showed that the sensitivity and selectivity were improved in modified system. The change in the oscillating period was linearly proportional to the negative logarithm (-logC) concentration of mercury ion in the range of 8.13×10-10-8.13×10-12 mol/L and the correlation coefficients was 0.9985. At the same time, mercury ions came from drinking water and Yellow river were determined, respectively.Part 3. Perturbation of 8-hydroxyquinoline on the modified B-Z oscillating system by iodideIn this part, we described the sensitivity of B-Z oscillating system before and after modified to the environment by using 8-hydroxyquinoline as a detected object. It was found that the sensitivity was improved in modified oscillating system. A well linear relationship was existed between the oscillating period difference and the negative logarithm concentration of 8-hydroxyquinoline in the range of 2.50×10-9-3.16×10-11 mol/L and the correlation coefficients was 0.9980.Part 4. Determination of trace amounts of beryllium ion by B-Z oscillating chemical system using transient chaotic regimeA convenient method for the determination of trace amounts of beryllium ion by transient chaotic regime in the B-Z oscillating system was developed. The optimum conditions for the determination were also examined. Results showed that the product of the largest Lyapunov exponent and induction period was linearly proportional to the negative logarithm of concentration of Beryllium ions from 3.0×10-5 to 3.0×10-11 mol/L and the correlation coefficients was 0.9967. The detection limit of 2.8×10-11 mol/L was also obtained. In addition, the possible mechanism was discussed in brief. |
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