Appendix
Contaminant Analysis Required for Dredging Operations in the Thames
Water Injection Dredging/Plough Dredging/Bed Levelling
Determinand
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Detection Limit
(mgkg-1 dry weight)
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Analytical Technique/Notes
Note all fractions of a sample should be analysed
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Organics
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PAH Screen by HPLC
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Total hydrocarbons
<100
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Individual PAHS:
Naphthalene
Acenaphthylene
Acenaphthene
Fluorene
Phenanthrene
Anthracene
Fluroanthene
Pyrene
Benzo (a) anthracene
Chrysene
Benzo (b) fluroanthene
Benzo (k) fluoranthene
Benzo (a) pyrene
Indeno (1,2,3-cd) pyrene
Dibenzo (a,h) anthracene
Benzo (g,h,i) perylene
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<0.1
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PCBs – ICES 7 Congeners
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<0.02
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If PCB contamination identified further analysis for individual congeners may be necessary.
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Heavy Metals
Total metals should be analysed unless stated
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Arsenic
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<7
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Cadmium
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<0.4
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Chromium
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<40
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Lead
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<30
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Mercury
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<0.1
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Copper
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<18
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Nickel
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<20
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Zinc
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<124
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Organo-metallic Compounds
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Tri-butyl Tin & Di-butyl Tin
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<0.1
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Physical Properties
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PSD (particle size)
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Gravel, sand, silt fractions
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