Abstract
Twenty-two species of bacteria of marine, estuarine, and terrestrial origin were analyzed for cationic content by atomic absorption spectrophotometry after growth in a basal seawater medium. Alcaligenes marinus was analyzed from eight separate but replicate determinations yielding the following cationic concentrations: Na, 5,600 +/- 2,260; Mg 1,580 +/- 740; K, 700 +/- 360; Ca, 790 +/- 390; Mn, 1.7 +/- 0.5; Fe, 256 +/- 57; Ni, 1.7 +/- 0.7; Cu, 14 +/- 4; Zn, 122 +/- 27; Cd, 2.8 +/- 0.7; and Pb, 10 +/- 3 ppm/(dry weight). Washing A. marinus cells before analyses was necessary due to interstitial medium within the cell pellets after centrifugation and loose cationic retention by the cells. The principal source of error in the procedure was ascribed to variability due to washing cells with 0.5 M ammonium formate. The mean cationic concentrations for trace elements in the 22 bacterial cultures grown in the basal seawater medium to constant optical density and washed three times with 0.5 M ammonium formate were: Mn, 2.4 +/- 3.8; Fe, 262 +/- 112; Ni, 2.3 +/- 1.8; Cu, 24 +/- 17; Zn, 146 +/- 72; Cd, 3.8 +/- 2.5; and Pb, 17 +/- 21 ppm (dry weight). Major ions were concentrated only occasionally by the cells after washing, whereas Mn, Fe, Ni, Cu, Zn, Cd, and Pb were concentrated from the medium by the following factors on the average: 180, 1,600, 140, 1,200, 750, 1,900, and 900, respectively.
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