Appendix B: Contaminant analysis - disposal to land

Contaminant Analysis Required for Dredging Operations in the Thames

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 See notes	Initial screen, if hydrocarbon contamination present further analysis would be necessary for individual PAHs.
PCBs – ICES 7 Congeners	<0.02	If PCB contamination identified further analysis for individual congeners may be necessary.
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