TRACE ELEMENTS AND COMPOUNDS IN WATERS
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operator is concerned, and which are significant from a health viewpoint, are not easily determined. Indeed the sophistication of the procedures and instrumentation now used for chemical analysis of water is terribly impressive when one remembers the relatively simple procedures that were spelled out in the early issues of Standard Methods. At one time, that publication was about 100 pages in length, and it didn't take an expert to follow the directions. Now, with gas chromatography, atomic absorption, and emission spectroscopy, few people other than an experienced chemist would attempt a water analysis. Yet this capability and precision is needed because of the vast number of chemicals that are in use in the environment some of which, in both tiny and large amounts, find their way into drinking-water sourccs. It is the author's purpose to examine the situation with regard to the chemical constituents of drinking water. The first thing to be considered is the evolution of drinking-water standards with respect to chemical limits.