• 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