Download PDF by Friend J.N. (ed.): A Textbook of Inorganic Chemistry

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UV–Vis is routinely used for the determination of solutions of transition metals, which are often coloured, and highly conjugated organic compounds. For example, determination of iron by forming a coloured complex with 1,10-phenanthroline can be detected by visible spectrophotometry2,3. The analysis of nitrate nitrogen in water4,5, phosphate in water 6 and soil7 and lead on the surfaces of leaves8 can also be determined colorimetrically. Many pharmaceuticals, dyes and other organic compounds can be detected easily by UV due to their strong chromophores.

The recombined light produces an interference spectrum of all the wavelengths in the beam before passing through the sample. In other words, the sample sees all the wavelengths simultaneously and the interference pattern changes with time as the mirror is continuously scanned at a linear velocity. The result of the sample absorbing radiation is a spectrum in the time domain called an interferogram. Fourier transformation (FT) converts this very complex signal to the frequency domain. Combined FTIR and Raman spectrometers based on the Michelson interferometer are commercially available.

When a temperature difference is experienced at the junction, a potential difference can be measured. A series of thermocouples together is called a thermopile. Thermistors and bolometers are based on a change in resistance with temperature. They have a faster response time than thermocouples. With a Fourier Transform IR (FTIR), where rapid response and improved sensitivity is key, lead sulfide and InGaAs detectors are used as for NIR. Some arrays are also used. g. InGaAs. An extra requirement for the FT–Raman instrument is a notch or edge filter; it is included to reject scattered laser light at the strong Rayleigh line, which could otherwise obscure the FT–Raman spectrum.

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A Textbook of Inorganic Chemistry by Friend J.N. (ed.)

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