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Sample Identification Codes and Labeling

Algal samples are assigned a unique 16-character identification code that is entered on sample labels (fig. 3) and on field data sheets (figs. 5 and 6). This sample ID number provides information for the (1) name of the study unit, (2) month and year of sample collection, (3) sample type and subtype, (4) sample number, and (5) sample element code as follows (fig. 7):

Figure 7.--Example of the 16-character sample identification code used by the National Water-Quality Assessment Program.