4. bahan organik sedimen - universitas...

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Accumulated Organic Content

Sinking velocity and travel time for spherical particles in

nonturbulent freshwater (after von Engelhardt

1973, Littke et al. 1997a)

Correlation between

marine organic

carbon

content and

sedimentation rate

sediments

deposited in normal open-

ocean environments (field A),

upwelling high-productivity

areas (field A’) and anoxic

environments (field B)

Allochthonous Organic Matter

Autochtonous

Alochthonous

Organic Matter

accumulate organic matter from

the (mainly planktonic) productivity in the

overlying water column

• redeposition of marine sediments after

erosion

• turbidity current by which sediment is

suspended in the near-bottom water

column and then settles again

Turbidity currents may expose the organic

matter to an oxygen rich water mass causing

further degradation during resettling

The redeposited allochthonous sediment will

differ only very little in age from the underlying

autochthonous sediment

Organic Carbon

pore-water DOC

concentrations generally

increase with depth

In anoxic sediments :

sulfate reduction

dominates and benthic

macrofaunal processes

(i.e., bioturbation

and/or bioirrigation)

are insignificant

Pore-water DOC concentrations versus depth in bioturbated

and/or bioirigated

Organic Nitrogen

Organic Phosphorus

Dissolved Transport Index (DTI)

Rasio antara konsentrasi materi teruspensi dengan

transport totalnya

Makin tinggi DTI makin besar komposisi elemen terlarut

%100

x

partikeliteradsorpskimiaelementerlarutkimiaelemen

terlarutkimiaelemenDTI

Kapasitas Adsorbsi

Banyaknya zat terlarut yang teradsorpsi oleh setiap gram

adsorben pada keadaan jenuh

%100

partikeliteradsorpskimiaelementerlarutkimiaelemen

partikeliteradsorpskimiaelemenadsorpsiKapasitas

• Jelaskan fate bahan organik C, N, P di sedimen (lengkapi dengan diagram/skema bila perlu)

• Bila ada data sbb, hitung nilai DTI dan kapasitas adsorpsi. Jelaskan maknanya

TUGAS

St1 St2 St3 St4 St1 St2 St3 St4

Silikat N Kjendhal

saring 17.96 14.425 5.595 5.391 saring 1.024 1.118 0.605 0.733

tdk

saring17.874 15.417 7.098 5.888

tdk

saring2.033 1.343 0.775 0.541

PO4 Total P

saring 0.157 0.188 0.097 0.081 saring 0.42 0.188 0.446 0.171

tdk

saring0.02 0.853 0.109 0.026

tdk

saring 0.134 0.108 0.167 0.19