Comparison of methods for the determination of trace elements in seawater

Abstract

1585seen from Table VI, the values for the digested sera obtained by A1F MAS and the ISE show fairly good agreement, while the values for the digested sera are slightly larger than those for the nondigested sera obtained by AlF MAS. There may be a possibility that the differences of analytical results for nondigested and digested sera originate from contamination during the complicated procedures of dry ashing or from the existence of another form of fluorine; e.g., volatile organic fluorine compounds which may not be detected by AlF MAS.However, since A1F MAS has less chance of contamination because of its simplicity and rapidity, the present results may strongly support the existence of fluorine bound to protein, which was suggested by Taves (2, 3 ) .ACKNOWLEDGMENT T h e authors thank to S. Kamei for providing the blood serum samdes. We also exmess our thanks to S. Fuiiwara Taves, D. R. Nature (London) 1968, 220, 582-583. Taves, D. R. Talanta 1966, 75, 969-974.

Quinoline-8-ol-immobilized Amberlite XAD-4: Synthesis, characterization, and uranyl ion uptake properties suitable for analytical applications

“…Chelex-100, which has iminodiacetic acid functionality on the polystyrene matrix, is the most widely used resin [19]. However, it lacks selectivity [20]. Amberlite XAD series resins have shown promise for designing chelating resins [21,22,23,24,25].…”

The determination of copper, cadmium, and lead in sea water by anodic stripping voltammetry with a thin film mercury electrode

“…The sample had been filtered through a 0.45 pm filter, acidified to pH 1.6 and stored in a PE bottle. The sample was also analyzed by the Analytical Section Laboratories of the National Research Council in Ottawa, Ontario using graphite furnace atomic absorption spectrometry after a preconcentration of the trace metals (30). The comparative results are given in Table 2 and the agreement is good.…”

“…The results are summarized in Table 4 In order to integrate the ASV procedures described into a total system of analysis a sampling excursion was undertaken to Sandy Cove, Nova Scotia. Water from this site has been analyzed in other studies (30,32) and it is considered to be representative of relatively unpolluted but near shore SW. The samples were collected on June 7, 1979 at a distance of 0.8 km from shore (44" 28' N, 63" 34' W) and at a depth of 20 m. The SW had a salinity of 30.9%, a p H of 8.06, and a temperature of 9.5"C.…”

Ultra-Trace Determination of Lead(II) in Water Using Electrothermal Atomic Absorption Spectrometry after Preconcentration by Solid-Phase Extraction to a Small Piece of Cellulose Acetate Type Membrane Filter

“…The determination of lead(II) at parts per trillion levels in natural water samples using ETAAS requires a preliminary separation and preconcentration step to eliminate the matrix components, and to improve the detection limits. Several preconcentration methods have been used for trace lead(II) determinations; these include co-precipitation, 2,3 liquid-liquid extraction, [4][5][6][7] solid-phase extraction (SPE), [8][9][10][11][12][13][14][15][16][17] combination of co-precipitation and SPE, 18 combination of liquid-liquid extraction and SPE, 19 and cloud point extraction. 20 Research in this area has recently been reviewed; several different techniques have been outlined.…”