Appendix B: Contaminant analysis - disposal to land

Contaminant Analysis Required for Dredging Operations in the Thames

Disposal to Land

 

Determinand
Detection Limit
(mgkg-1 dry weight)
Analytical Technique/Notes
Note all fractions of a sample should be analysed
General
PH Value
-
-
Total Sulphate
<2000
 
Sulphide
<10
 
Elemental Sulphur
<100
 
Monohydric Phenols
<2
 
Cyanides
 
 
Total Cyanide
<5
Further cyanide analysis may be necessary if levels exceed 20 mgkg-1.
Free Cyanide
See notes
 
Complex Cyanide
See notes
 
Thiocyanate
See notes
 
Organics
PAH Screen by HPLC
Total hydrocarbons <100
 
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
<0.1
 
Heavy Metals
Arsenic (total)
<7
 
Cadmium (total)
<0.4
 
Chromium (total)
<40
 
Lead (total)
<30
 
Mercury (total)
<0.1
 
Selenium (total)
<1
 
Copper (total)
<18
 
Nickel (total)
<20
 
Zinc (total)
<124
 
Available Lead
<200
 
Available Nickel
<20
 
Available Copper
<100
 
Available Zinc
<250
 
Zinc Equivalent
<250
 
Trace Metals/metalloids
Total parameters should be analysed unless stated
Barium
<500
 
Available Boron
<2
 
Magnesium
<500
 
Manganese
<500
 
Beryllium
<5
 
Vanadium
<100
 
Organo-metallic Compounds
Tri-butyl Tin & Di-butyl Tin
<0.1
 
Physical Properties
 
 
PSD (particle size)
Gravel, sand, silt fractions
 

 
 
 

 

 

 

 
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