The sample extraction and concentration steps in this method are essentially the same
as in Methods 606, 608, 609, and 612. Thus, a single sample may be extracted to
measure the parameters included in the scope of each of these methods. When
cleanup is required, the concentration levels must be high enough to permit selecting
aliquots, as necessary, to apply appropriate cleanup procedures. The analyst is
allowed the latitude, under Section 12, to select chromatographic conditions
appropriate for the simultaneous measurement of combinations of these parameters....