. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 12 ANALYTICAL METHODS IN OCEANOGRAPHY Table I. Comparison of Pump and Phosphate Nitrate Nitrite Silicate (n(l at/l) (W at/l) (m at/l) (ixg at/l) 'ation Pump Niskin Pump Niskin Pump Niskin Pump Niskin S 6 < < 8 12 < 13 < < 22 25 »
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 12 ANALYTICAL METHODS IN OCEANOGRAPHY Table I. Comparison of Pump and Phosphate Nitrate Nitrite Silicate (n(l at/l) (W at/l) (m at/l) (ixg at/l) 'ation Pump Niskin Pump Niskin Pump Niskin Pump Niskin S 6 < < 8 12 < 13 < < 22 25 » Niskin bottle with internal closures ketone (9). The results of these analyses are shown in Table I. It is readily apparent either that no nutrient contamination or loss occurs with either sampling system or that any contamination or loss is identical in each system. This second possibility is unlikely because of the consider- able differences in the two systems. The same conclusion—that neither sampler contaminates the sample—may be reached for manganese. How- ever, for copper, to a lesser extent for nickel, and possibly for iron, the pump system contaminated the sample. In light of the above data, use of the pump system was discontinued, and a Niskin Rosette sampler (Figure 3) was used to perform a com-. Figure 3. Rosette sampler with 10-1. top drop bottles 697. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic Laboratories; United States. Environmental Science Services Administration. Research Laboratories; Environmental Research Laboratories (U. S. ). Washington, D. C. : U. S. Dept. of Commerce, Environmental Science Services Administration, Research Laboratories : For sale by Supt. of Docs. U. S. G. P. O.
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