ch 10 Flashcards
sidephores
bact secreted ligands that move iron across membranes
light in iron transfer
moves iron bw oxidized and reduced forms
iron complexes
if iron is not dissolved, its gone for the surface and sinks
complexation is a good way to make it accessable
iron and CO2
inversely related
iron being available is used by algae, they use up CO2 and decrease it from air and give ice age conditions
iron 2+ is what complexes
what trace metal is important in anoxic enviroments
SO3-
organic complexation trends
the conc of ligand is much higher than metal so metal specificity is imporant
kf is important - higher kf is better
complexed cu and hg and fe
complexed cu less availabe- less toxic
hg more available- more toxic
iron more availabe- good for algae- dec cO2
free ion complexation imporatnt for
Mn
Co
Ni
Ag
Cd
organic complexation important for
Cu
Zn
Fe
Pb
Hg
complexing agents for free ion complexation
OH-
Cl-
SO42-
CO32-
DOM
DOM in complexes
acts as ligand- negative- multipe binding sites- chelating- more thermodynamically stable- higher kf
metals are lewis_
acids
accept electrons
most transition metals can bind _ ligand atoms
6
weak acids do what
act as buffers and stabilize pH changes in ocean
how can we estimate the djistribution of H2CO3, HCO3- and CO32- at differnt ph values
using pH and the two kas of carbonic acid
what changes that k values for the different carbonic acid forms
strongly increase w temp and weakely decrease w salinity
pX =
-log [x]
log a (b) = c means
a ^ c = b
bronsted lowry acid is a _
proton donor
minor anions are _ paired
highly
mostly w na+ and mg++
chloride is _ paired
major anion
almost entirely free
SO42- is _ paired
major anion
only 1/3 free
major cations in seawater are _ paired
mostly present as free and if apired w SO42-
what are the major cations in water
H+
Na+
Mg2+
K+
Ca2+
Sr2+
why must we use activity
bc of non specific efects in non ideal non dilute conditions
how do we account for non specific effects
use activity
use equilibrium constant defined at T,S, P
what kind of interaction is chemical bond and ion interaction
bond- specific
ion- non specific
when solution contains higher conc of salts, solution
is no longer specific even tho in ideal solution, hydrated ions dont interact w each other and only have specific effects
ion hydration- organization
diff degrees of organization depending on distance from primary solvation shell
what effects can be described using equilibrium coefficient
specific effects
short distance interactions
formation or dissolutino of solid- usually invoves hydration
percipitation/ dissolution
inc of water molecule into or bw mol wo chem recation
hydratino
movement of a molecule from one phase to another
partitioning
chemical intecration bw chemical and surface
adsorption/ desorption
eqm
thermo state of min energy
