1. METHODOLOGY
   1. Field
      1. Orange Peel grab
         1. Surficial sediment
   2. Laboratory
      1. Teflon bomb digestion
         1. ICP-MS
2. ECOLOGICAL RISK ASSESSMENT
   1. Sediment quality guidelines
      1. Not polluted
   2. ERL/TEL & ERM/PEL guidelines
      1. < ERM/PEL
         1. Not toxic to organism
   3. m-ERM-Q
      1. m-ERM-Q < 0.5
         1. < 21% probability of toxicity to organism
3. SEDIMENT QUALITY ASSESSMENT
   1. Direct comparison
      1. N1-N2 classification
         1. <N1 value
            1. Further action not required
      2. UCC
         1. >UCC value
            1. Co, Cu, As, Cd, Pb
         2. <UCC value
            1. Cr, Mn, Fe, Zn, Hg
   2. Normalization
      1. EF
         1. EF<2
            1. Minimal enrichment
            2. All MTEs except Pb
         2. 2<EF<5
            1. Moderate enrichment
            2. Pb
      2. Igeo
         1. Igeo<0
            1. Practically uncontaminated
            2. All MTEs except Pb
         2. 0<Igeo<1
            1. Slightly contaminated
            2. Pb
      3. PLI
         1. PLI<1
            1. Low contamination
            2. Quiberon bay
         2. 1<PLI<3
            1. Moderate contamination
            2. Gulf of Morbihan
4. SOURCE OF CONTAMINATION
   1. Natural
      1. Soils & rocks erosion
      2. Weathering process
   2. Anthropogenic
      1. Shipping activities
      2. Municipal run-off
      3. Mariculture activities
      4. Agriculture activities
      5. Surface run-off
5. STUDY AREA
   1. Quiberon bay
      1. Dec 2009 93 samples
         1. Oct 2010 103 samples
   2. Gulf of Morbihan
      1. Dec 2009 101 samples
         1. Oct 2010 121 samples
6. GENERAL FACTOR CONTROLLING MTE
   1. Geomorphology
   2. Types of sediment
   3. TOC contents
   4. Hydrodynamic process
   5. Bathymetry
7. Why MTE levels is low?
   1. Open environment
      1. Quiberon bay
   2. Sandy type sediment
   3. Shell rich sediment
   4. Low TOC contents
   5. Quiberon bay
      1. Weak hydrodynamic
      2. Shallow water
   6. Gulf of Morbihan
      1. Strong hydrodynamic
      2. Deep water
8. Why MTE levels is high?
   1. Closed environment
      1. Gulf of Morbihan
   2. Sheltered zone
      1. Trinité-sur-Mer
      2. Innermost of the gulf
      3. Rivers zone (Auray, Marle & Noyalo)
   3. Muddy type sediment
   4. High TOC contents
   5. Quiberon bay
      1. Strong hydrodynamic
      2. Deep water
   6. Gulf of Morbihan
      1. Weak hydrodynamic
      2. Shallow water