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• Due Monday Due Monday 3-28-103-28-10• Follow the guidelineFollow the guideline
Term paper Term paper
Elemental classification Lewis acid/base Pearson’s hard/soft metals Ionic and covalent index Ionic potentials
Earth Scientist's Periodic Table of the Elements and Their Ions
Common minerals and aqueous species in soils
Familiar with equilibrium reactions Use log activity-pH graphs
Trace metals reviewTrace metals review
Ionic potential and solubility Ionic potential and solubility IP = ionic charge (Z)/ionic radius (r)
• Low IP high solubility
JCB lecture
Ionic potential and solubility Ionic potential and solubility IP = ionic charge (Z)/ionic radius (r)
• Low IP high solubility IP and metal solubility
• IP <2.5 (low): H-O > O-Me Remain in solution Ba, Li, Rb, & Sr
JCB lecture
O2-
H+
H+M+
Ionic potential and solubility Ionic potential and solubility IP = ionic charge (Z)/ionic radius (r)
• Low IP high solubility IP and metal solubility
• IP <2.5 (low): H-O > O-Me Remain in solution Ba, Li, Rb, & Sr
• 2.5 < IP < 9.5 (medium): H-O ~ O-Me Tend to precipitate Cu, Ni, Pb, U, Zn, Cr, & Co
JCB lecture
M+O2-
H+
Ionic potential and solubility Ionic potential and solubility IP = ionic charge (Z)/ionic radius (r)
• Low IP high solubility IP and metal solubility
• IP <2.5 (low): H-O > O-Me Remain in solution Ba, Li, Rb, & Sr
• 2.5 < IP < 9.5 (medium): H-O ~ O-Me Tend to precipitate Cu, Ni, Pb, U, Zn, Cr, & Co
• >9.5 (high): H-O < O-Me Form oxyanions As, B, Mo, and Se
JCB lecture
M+ O2-
http://www.gly.uga.edu/railsback/PTTalk/PTTalk060.html
Elemental classification Lewis acid/base Pearson’s hard/soft metals Ionic and covalent index Ionic potentials
Earth Scientist's Periodic Table of the Elements and Their Ions
Common minerals and aqueous species in soils
Familiar with equilibrium reactions Use log activity-pH graphs
Trace metals reviewTrace metals review
Overviewhttp://www.gly.uga.edu/railsback/PT.html
Slides’ presentation
http://www.gly.uga.edu/railsback/PTTalk/PTTalk002.html
Online table with popup text
http://www.gly.uga.edu/railsback/PTPopups2.html
Charges Multiple times Cation-elemental-anion-gas
Hard/soft cations Ionic potential
http://www.gly.uga.edu/railsback/PTTalk/PTTalk122.html
Classification based on IP Medium IPMedium IP (2.5-9.5)
Strong bond w/ O: enter early in igneous rocks Make oxides-insoluble Concentrated in soils Not nutrients Least depleted from the mantle
Fig. 6 Solubility of oxides of hard cations
Classification based on IP Medium IPMedium IP (2.5-9.5)
Strong bond w/ O: enter early in igneous rocks Make oxides-insoluble Concentrated in soils Not nutrients Least depleted from the mantle
LowLow IPIP (<2.5) Weak bond w/ O: enter late in igneous rocks Make fluoride minerals-soluble Abundant in rivers and seawaters Serves as nutrients