By Jacques Guertin, Visit Amazon's James A. Jacobs Page, search results, Learn about Author Central, James A. Jacobs, , Cynthia P. Avakian
Prepare through a crew of scientists, engineers, regulators, and attorneys, the Chromium(VI) guide consolidates the newest literature in this subject. The large scope of this e-book fills the necessity for a complete source on chromium(VI), enhancing the information of this contaminant at a time while the level and measure of the matter remains to be being assessed. It addresses clearly happening and anthropogenic assets, geology and geochemistry, toxicity, therapy, regulatory concerns and felony circumstances, and proposals. The guide is a well timed and useful reference for environmental scientists, engineers, urban planners, and extra.
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Extra resources for Chromium(VI) Handbook
California Air Resources Board (2001b); 21. Winter: WebElements (2001); 22. Firestone (2002). Chemistry, Geochemistry, and Geology of Chromium 45 Efforts have been made to deÀne what is meant by the terms “natural,” “normal,” and “background” and why such distinctions are important. Fergusson (1990) notes the following: An important reason for knowing the natural concentrations of the heavy elements is that they provide a true reference point for estimating the extent of pollution from the elements.
2 Elemental/Metallic Chromium Characteristics Chromium (atomic number 24) is a transition element occurring in Group 6B of the periodic table. 1d. 2). In the periodic table, transition elements (all metals) (Groups 1B to 8B) occur between the main group elements (Groups 1A to 2A and Groups 3A to 7A and the inert gases—Group 8A) (Drew, 1972; Timberlake, 2003). The atoms of transition elements have electrons Àlling d subshells consisting of Àve d orbitals. The transition elements are noteworthy because Àve d orbitals: 1.
Dash (—) indicates no available data. Values in parenthesis are tentative. 61 Cr Cr 62Cr 63Cr 64Cr 65Cr 66Cr 67Cr 60 Chemistry, Geochemistry, and Geology of Chromium 33 Radioactive isotopes of Cr have been artiÀcially produced. Most have very short half-lives (t1/2). 5 shows that the t1/2 for isotopes from 42Cr to 47Cr and from 57Cr to 64Cr are much less than 1 s. , 2002). 6). 6). More common are Cr(III) compounds such as chromium tribromide (insoluble), chromium nitrate (soluble), chromic hydroxide (insoluble), and chromic oxide (insoluble).
Chromium(VI) Handbook by Jacques Guertin, Visit Amazon's James A. Jacobs Page, search results, Learn about Author Central, James A. Jacobs, , Cynthia P. Avakian