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Exercise 8.

a)Put the words into the gaps: need, organic, trace, use, offer, sensitivity, for,

examples, by, utility, applications, modified, samples, reports.

Utility of chemically modified electrodes

Today there is a great …. . For the development of analytical methods for the selective and quantitative determination of metal ions and …. contaminants at … level, particularly, in the light of new challenges posed by environmental … One field that offers great potential in this respect is that comprised by chemically … electrodes. Chemically modified electrodes are very suitable … electroanalytical … since they … high … . There have been some … on the …. of chemically modified electrodes for electroanalysis. One of the first … of the analytical … of these modified interfaces was represented … Lane and Hubbard.

b)Finish the sentences:

1. Price and Baldwin reported on the use of …

2. Chemically-modified electrodes offer …

3. Chemically modified electrodes are very suitable for …

4. These studies point to the feasibility of …

5. This method is based on …

6. They complexed Fe (III) ions from …

c)Grammar quiz: correct the mistakes:

1. Cox and Majda incorporated Fe(II) from a platinum electrode.

2. They furthermore hintes on the possibility of modulating the coordinative properties.

3. There has been some reports for the use of chemically modified electrodes for electroanalysis.

4. These studies points in the feasibility of use not only metal/ligand intaraction but electrostatic effects for performing electroanalysis.

d)Reading check: Are these sentences true or false?:

1. Today there is no need for the development of analytical methods for the selective and quantitative determination of metal ions and organic contaminants at trace level.

2. Hunter reported on the use of hydrogen for the determination of aromatic amines absorbed on the surface of a platinum electrode.

3. Cheek and Nelson reported on the determination of Fe (I) from the solution.

4. Chemically modified electrodes are very suitable for electroanalytical applications since they don’t offer high sensitivity.

Texts for educational purposes

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