. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography t2 ANALYTICAL METHODS IN OCEANOGRAPHY floor of the graphite tube, which is not uniformly heated. Atomization does not take place simultaneously at all points in the tube, which leads to a broader, smaller, output signal. In seawater, the curvature is much greater, and the large quantity of salt must have an additional effect at larger injection volumes. Similar calibrations were obtained for other elements. Figures 13 and 14 show the corresponding c
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography t2 ANALYTICAL METHODS IN OCEANOGRAPHY floor of the graphite tube, which is not uniformly heated. Atomization does not take place simultaneously at all points in the tube, which leads to a broader, smaller, output signal. In seawater, the curvature is much greater, and the large quantity of salt must have an additional effect at larger injection volumes. Similar calibrations were obtained for other elements. Figures 13 and 14 show the corresponding calibration for the volatile element cadmium. In order to show the effect of total salt quantity in the atomizer, a series of injections were made for cadmium and manganese analysis with different volumes of solution but with the same total quantity of the analysis metal present per injection. Three series of injections were made—in distilled water, in seawater, and in seawater diluted to main- tain the total salt quantity per injection constant. The results are shown in Figures 15 and 16 for manganese and cadmium, respectively. It is o z < m o (n m < 40 ppb. x Sea water 350 fig sea water salts per injection o Distilled water "T~ 10 -1- 20 -I- 30 -T- 40 INJECTION VOLUME (/il) Figure 15. Effect of injection volume on the ab- sorbance of ng of manganese in distilled water with 350 ng of seawater dissolved salts per injection and in seawater of 35%0 salinity apparent that the injection volume alone has only a small effect on the sensitivity, although some sensitivity loss occurs with increasing volume of distilled water. The effect of increased total salt content in the atomizer is to reduce the sensitivity in each case, presumably because of a sup- pression of dissociation or similar phenomenon. The effect of maintaining 684. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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