Canadian Sediment Quality Guidelines for the Protection of Aquatic Life

The Canadian Sediment quality guidelines were developed by the Canadian Council of Ministers of the Environment as broadly protective tools to support the functioning of healthy aquatic ecosystems (CCME, 2001). They are based on field research programmes that have demonstrated associations between chemicals and biological effects by establishing cause and effect relationships in particular organisms.

Comparison of measured concentrations of various contaminants within the sediments with these guideline values will, therefore, provide a basic indication on the degree of contamination and likely impact on ecology.

The guidelines consist of threshold effect levels (TELs) and probable effect levels (PELs). The TELs and PELs are used to identify the following three ranges of chemical concentrations with regard to biological effects. It is likely that the TELs will be adopted as the ISQGs (CCME, 2001):

Below the TEL; the minimal effect range within which adverse effects rarely occur.
Between the TEL and PEL; the possible effect range within which adverse effects occasionally occur.
Above the PEL; the probable effect range within which adverse effects frequently occur.

The table below lists the existing sediment quality guidelines for some of the parameters that have been monitored. This shows the interim marine sediment quality guidelines (ISQGs)/threshold effect levels (TELs), probable effect levels (PELs)(dry weights) and incidence (%) of adverse biological effects in concentration ranges defined by these values.

Substance	Units	ISQG/TEL	PEL	Incidence (%£ISQG)	Incidence (ISQG<%<PEL)	Incidence (%³PEL)
Metals
Arsenic	mg.kg-1	7.24	41.6	3	13	47
Cadmium	mg.kg-1	0.7	4.2	6	20	71
Chromium	mg.kg-1	52.3	160	4	15	53
Copper	mg.kg-1	18.7	108	9	22	56
Lead	mg.kg-1	30.2	112	6	26	58
Mercury	mg.kg-1	0.13	0.7	8	24	37
Zinc	mg.kg-1	124	271	4	27	65
Polychlorinated byphenyls (PCB)
PCBs: total PCBs	mg.kg-1	21.5	189	16	37	55
Polyaromatic hydrocarbons (PAH)
Acenaphthene	µg.kg-1	6.71	88.9	8	29	57
Acenaphthylene	µg.kg-1	5.87	128	7	14	51
Anthracene	µg.kg-1	46.9	245	9	20	75
Benz(a)anthracene	µg.kg-1	74.8	693	9	16	78
Benzo(a)pyrene	µg.kg-1	88.8	763	8	22	71
Chrysene	µg.kg-1	108	846	9	19	72
Dibenz(a,h)anthracene	µg.kg-1	6.22	135	16	12	65
Fluoranthene	µg.kg-1	113	1494	10	20	80
Fluorene	µg.kg-1	21.2	144	12	20	70
2-Methylnaphthalene	µg.kg-1	20.2	201	0	23	82
Naphthalene	µg.kg-1	34.6	391	3	19	71
Phenanthrene	µg.kg-1	86.7	544	8	23	78
Pyrene	mg.kg-1	153	1398	7	19	83

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