Abstract
Several qualitative microprobe studies have been focused on the distribution of essential and non-essential metals between the various types of metal-rich invertebrate spherites (Brown, 1982; Morgan, 1984; Morgan and Winters, 1987). The conclusion drawn from these observations is that, in general and despite the competitive tendancy extant in multimetal and multi-ligand situations in vivo, the metals are preferentially bound to cellular ligands according to their equilibrium constants for metal-ligand complexes (Nieboer and Richardson, 1980): Class A (‘hard acid’) metals such as Ca, Mg, Mn, Sr and Pb show a preference for oxygen donating ligands according to the sequence O>N>S; Class B (’soft acid’) metals such as Cd, Cu, Hg conform to the ligand sequence S>N>O (Simkiss, 1981; Simkiss and Taylor, 1981; Simkiss et al., 1982; Morgan and Winters, 1987).
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© 1989 Springer-Verlag Berlin Heidelberg
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Morgan, A.J., Roos, N., Morgan, J.E., Winters, C. (1989). The Subcellular Accumulation of Toxic Heavy Metals: Qualitative and Quantitative X-Ray Microanalysis. In: Zierold, K., Hagler, H.K. (eds) Electron Probe Microanalysis. Springer Series in Biophysics, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74477-8_5
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DOI: https://doi.org/10.1007/978-3-642-74477-8_5
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