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ANALYSIS OF METAL FINISHING BATHS
A key to Quality, Productivity, Cost-Savings and a Cleaner Environment
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2. Optical Methods * or **
Under the term "Optical Methods" are grouped a range of techniques which differ in their underlying principles and the analytes to which they are suited. These are discussed below. Excluded from "Optical Methods", all of which normally use either white light or monochromatic light, are "Spectroscopic Methods" (Section 5) in which radiation over a complete wavelength range is used. In certain cases, which will be evident, there is unavoidably a degree of overlap between these two concepts.
The diagram above, illustrates the basis of the main optical methods. It shows light (which will usually be monochromatic) from a light source, entering the sample cell, which will usually contain a clear liquid (but see below), then being captured by a detector (I or II).
2.1 Colorimetry
2.2 Turbidimetry
2.3 Refractive index
2.4 Optical rotation