Organoselenium Compounds in the Environment

A coupled natural immobilisation mechanism for mercury and selenium in deep-sea sediments

“…Mercury has three valency states (I, II, and 0), and the ready interconversion of inorganic and organic forms, including the possibility of disproportionation reactions, means that the environmental behavior of Hg is complex (Jonasson and Boyle, 1972;Craig, 1986b;Rasmussen, 1994). Continuing Hg loss from sediments decades after contaminating Hg inputs had ceased has been demonstrated by following the Hg levels in sediments (Bothner et al 1980;Gagnon et al 1997) and biota (Locarnini and Presley, 1996) over time.…”

“…Huerta-Diaz and Morse (1992) demonstrated that Hg develops a higher content in pyrite than in precursor early diagenetic Fe sulfides, an uptake which probably involves solution transfer of Hg. A consensus of recent investigations is that anoxic sedimentary environments with low sulfide concentrations are conducive to Hg(II) methylation and loss of Hg from sediments (Craig, 1986b;Gagnon et al 1996). This paper demonstrates that an efficient natural immobilisation mechanism for Hg exists immediately below the oxic/ post-oxic boundary in certain deep-sea sediments.…”

A Novel Field of Research: Bioorganometallic Chemistry, Origins, and Founding Principles

“…This book will not deal in detail with the toxicological and environmental problems associated with the use of organometallics since these subjects have been covered extensively in books by Thayer [44] and Craig [74], respectively. However, it is worth noting that the toxicity of organometallic compounds, e.g.…”

Mercury Contaminated Material Decontamination Methods: Investigation and Assessment

“…The commercial uses of organomercury compounds are given in Table 2-10. Note that many uses have been regulated (Craig 1986, USEPA 1997. …”