. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 14 ANALYTICAL METHODS IN OCEANOGRAPHY taminates the sample with iron. Possibly, this iron is in the form of very fine particles which pass through the Nuclepore filter. This hypothesis is supported by the much larger drop in iron concentration with time in this than in both of the other bottles. This drop in "dissolved" iron con- centrations is probably caused by agglomeration of colloids which become large enough to be retained by the fil
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 14 ANALYTICAL METHODS IN OCEANOGRAPHY taminates the sample with iron. Possibly, this iron is in the form of very fine particles which pass through the Nuclepore filter. This hypothesis is supported by the much larger drop in iron concentration with time in this than in both of the other bottles. This drop in "dissolved" iron con- centrations is probably caused by agglomeration of colloids which become large enough to be retained by the filter. Newly formed colloidal-sized iron-containing particles generated from the rubber springs would be expected to agglomerate at a faster rate than the already aged material present naturally. The use of a coil spring, whose new Teflon coat was not visibly damaged, contaminates the sample with small but significant amounts of both dissolved iron and zinc. Of particular interest, is the increase in zinc concentrations with time in all but the top drop bottle. Apparently, zinc continues to "dissolve" from the coil spring and possibly the rubber after closure, suggesting that deep ocean samples may be more contami-. Figure 4. Top drop Niskin bottle with snap-on pressure fittings for filtration 699. 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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