. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 7. segar and cantillo Flameless Atomic Absorption 67 salts and the consequent inability of the deuterium arc background cor- rector to compensate precisely for nonspecific absorption will reduce the reproducibility. Too high an ashing temperature will lead to significant loss of analyte metal from the atomizer before atomization and conse- quently a loss of analytical sensitivity. The effect of ashing time on man- ganese analysis in seawater is illu
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 7. segar and cantillo Flameless Atomic Absorption 67 salts and the consequent inability of the deuterium arc background cor- rector to compensate precisely for nonspecific absorption will reduce the reproducibility. Too high an ashing temperature will lead to significant loss of analyte metal from the atomizer before atomization and conse- quently a loss of analytical sensitivity. The effect of ashing time on man- ganese analysis in seawater is illustrated in Figures 6 and 7. At an ashing temperature of 600°C, little loss of manganese from the atomizer occurs even for long ashing times. However, the reproducibility of the analysis for seawater is extremely poor even at long ashing times (Figure 6). At an ashing temperature of 1100°C, although significant loss of manganese occurs from a distilled water matrix, the reproducibility of the analysis in seawater is much improved while the sensitivity is reduced by only about 25% (Figure 7). Optimum ashing times required at each tem- perature are similar. Little change in either reproducibility or sensitivity occurs with increasing time above 25 sec. The effect of ashing temperature upon the analysis of iron, man- ganese, and copper is illustrated in Figures 8, 9, and 10, respectively. .20 .15 10 .05 • 40 ppb IN DISTILLED WATER X 40 ppb IN SEAWATER A SEAWATER. 500° 1000° 1500° ASHING TEMPERATURE (°C) 2000° Figure 8. Effect of ashing temperature on the absorbance of 20-fil. injections of a 40-ppb spike of iron in distilled water and seawater and of un- spiked seawater (Fe < ppb) 679. 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
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