Figure 4.

Accumulation of Al within subcellular fractions (total and nonexchangeable cell wall [A] and total protoplasm [B]) of single cells of C. corallina as measured by GFAAS and ²⁶Al-AMS in response to changes in pH of exposure solutions. Single cells were mounted in each of 18, three-compartment chambers, with the center compartment containing 110 mL of 50 μm AlCl₃ in 0.4 mm CaCl₂ spiked with 50 pCi of ²⁶Al (pH 3.7–5.2). Total soluble Al in solution (C) was measured using the PCV method. Predicted activities of monomeric species of Al in solution (D) were independently calculated using GEOCHEM-PC, version 2.0. Values represent the means ± se of three replicates. Note difference in axes scales between A (μg m⁻² min⁻¹) and B (ng m⁻² min⁻¹).