Speciation - Geochemistry - Lecture Slides, Slides of Geochemistry

In these Lecture Slides, the Lecturer has put emphasis on following key points : Speciation, Element Exists, Molecules, Exist in Solution, Species, Gases, Minerals, Complex, Based On Complexation, Measure

Typology: Slides

2012/2013

Uploaded on 07/25/2013

rajdulari
rajdulari 🇮🇳

4

(6)

68 documents

1 / 6

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Speciation
Any element exists in a solution, solid, or
gas as 1 to n ions, molecules, or solids
Example: Ca2+ can exist in solution as:
Ca++ CaCl+ CaNO3+
Ca(H3SiO4)2 CaF+ CaOH+
Ca(O-phth) CaH2SiO4 CaPO4-
CaB(OH)4+ CaH3SiO4+ CaSO4
CaCH3COO+ CaHCO3+ CaHPO40
CaCO30
Plus more species gases and
minerals!!
Docsity.com
pf3
pf4
pf5

Partial preview of the text

Download Speciation - Geochemistry - Lecture Slides and more Slides Geochemistry in PDF only on Docsity!

Speciation

  • Any element exists in a solution, solid, or

gas as 1 to n ions, molecules, or solids

  • Example: Ca

2+

can exist in solution as:

Ca

++^

CaCl

+^

CaNO

+ 3

Ca(H

SiO 3

)^42

CaF

+^

CaOH

+

Ca(O-phth)

CaH

SiO 2

4

CaPO

- 4

CaB(OH)

+^4

CaH

SiO 3

+^4

CaSO

4

CaCH

COO 3

+^

CaHCO

+^3

CaHPO

(^04)

CaCO

(^0 )

-^

Plus more species

gases and

minerals!!

How do we know about all those

species??

  • Based on complexation

how any ion

interacts with another ion to form amolecule, or complex (many of these arestill in solution)

  • Yet we do not measure how much

CaNO

  • 3

, CaF

+^ , or CaPO

-^4

there is in a

particular water sample

  • We measure Ca

2+

But is that Ca

2+

really

how the Ca exists in a water??

Defining Complexes

  • Use equilibrium expressions: •^

cC + l

H

L

CL + l

H

  • Where B is just like K

eq

l

c

n

c

i^

HL C

H

CL

] [ ] [

] [ ] [^

 

Mass Action & Mass Balance

•^

mCa

2+

=mCa

2+ +MCaCl

+^ + mCaCl

(^02)

  • CaCL

-^3

CaHCO

  • 3
  • CaCO

(^03)

  • CaF

+^ + CaSO

(^04)

CaHSO

  • 4
  • CaOH

+^ +…

•^

Final equation to solve the problem sees themass action for each complex substituted intothe mass balance equation

l

c

n

c

i^

HL C

H

CL

] [ ] [

] [ ] [^

 

This image cannot currently be display ed.

^

n x

L

mCa

mCa

2

2

Docsity.com