Abstract
measurement of the intensity of light, and it includes visual colorimetry, filter photometry, spectrophotometry, flame photometry, turbidimetry, fluorimetry, and other specialized branches. The first three techniques are used extensively in water analysis because of their speed, convenience, and sensitivity. Nevertheless, the application of these methods is not as simple as is sometimes pictured. A discussion of the principles involved and of some of the available techniques may aid the analyst in avoiding pitfalls and in obtaining the maximum accuracy that is possible with the equipment at hand. In recent years, a considerable number of books and papers has been published on the pratical and theoretical aspects of photometric methods of analysis, reflecting an increasing use of, and interest in, such methods throughout the field of chemistry. Annual reviews have been appearing in Analytical Chemistry since 1949 (1-4). In addition to the other references
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