Acids and Bases Group

Information sheet

Acids and Bases Group

These substances were identified for action under the Chemicals Management Plan (CMP). The assessment focused on 22 substances referred to collectively in the assessment as the Acids and Bases Group.

Summary of publications
Timelines
Background

**Summary of publications**
Substance group	Subgroup	CAS RN	Common name	DSL name	Final assessment	Conclusion on section 64 criteria	Follow-up activities
Acids and Bases Group	Ammonia	5470-11-1^{Table 1 Footnote a}	Hydroxylammonium chloride	Hydroxylamine, hydrochloride	HTML	Does not meet section 64 (c) ^{Table 1 Footnote b}	None planned at this time from a human health perspective ^{Table 1 Footnote b}
	Free available chlorine, chlorate and chlorite	10049-04-4^{Table 1 Footnote a}	Chlorine dioxide	Chlorine dioxide
		7681-52-9^{Table 1 Footnote a}	Sodium hypochlorite	Hypochlorous acid, sodium salt
		7775-09-9^{Table 1 Footnote a}	Sodium chlorate	Chloric acid, sodium salt
		7778-54-3^{Table 1 Footnote a}	Calcium hypochlorite	Hypochlorous acid, calcium salt
		7782-50-5^{Table 1 Footnote a}	Chlorine	Chlorine
	Hydrogen and hydroxide	12136-45-7	Potassium oxide	Potassium oxide		Does not meet	None planned at this time
		1310-58-3	Potassium hydroxide	Potassium hydroxide
		1310-73-2	Sodium hydroxide	Sodium hydroxide
		1312-76-1	Potassium silicate	Silicic acid, potassium salt
		1344-09-8	Sodium silicate	Silicic acid, sodium salt
		7647-01-0	Hydrochloric acid	Hydrochloric acid
		7664-93-9	Sulphuric acid	Sulphuric acid
	Nitrate and nitrite	10124-37-5	Calcium nitrate	Nitric acid, calcium salt
		7631-99-4	Sodium nitrate	Nitric acid sodium salt
		7632-00-0	Sodium nitrite	Nitrous acid, sodium salt
		7697-37-2	Nitric acid	Nitric acid
		7757-79-1	Potassium nitrate	Nitric acid potassium salt
	Phosphate	1314-56-3	Diphosphorus pentoxide	Phosphorus oxide
	Phosphate	7664-38-2	Phosphoric acid	Phosphoric acid
	Sulphite	7631-90-5	Sodium bisulfite	Sulfurous acid, monosodium salt
	Sulphite	7681-57-4	Sodium metabisulfite	Disulphurous acid, disodium salt
Table 1 Footnote a This substance was not identified under subsection 73(1) of the Canadian Environmental Protection Act, 1999 but was included in this assessment as it was considered a priority on the basis of other human health concerns. Return to table 1 footnote a referrer Table 1 Footnote b These substances were considered only from a human health perspective in this assessment. Return to table 1 footnote b referrer

**Timelines**
Date	Activity
April 27, 2024	Publication of the final assessment. The related notice was published in the Canada Gazette, Part I: Vol. 158, No. 17.
December 4, 2021	Publication and start of 60-day public comment period on the draft screening assessment. The related notice was published in the Canada Gazette, Part I: Vol. 155, No. 49.

Background

Six of the substances in the Acids and Bases Group (hydroxylammonium chloride, sodium hypochlorite, sodium chlorate, calcium hypochlorite, chlorine, and chlorine dioxide) were previously addressed for ecological concerns by Environment Canada under the Priority Substances Assessment Program and a Proposed Risk Management Strategy addressing Ammonia, Inorganic Chloramines and Chlorinated Wastewater Effluents was published. These 6 substances are considered to have been addressed previously for ecological concerns and have not been re-assessed for their potential risk to the environment.

Two other substances (CAS RNs 18917-89-0 and 68442-82-0) were identified as being a part of the Acids and Bases Group at the outset of the third phase of the CMP. These substances were subsequently determined to be of low concern to both human health and the environment, through other approaches. Conclusions for CAS RNs 18917-89-0 and 68442-82-0 are provided in the Final Screening Assessment for the Rapid Screening of Substances with Limited General Population Exposure.

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Date modified:: 2024-04-26

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Acids and Bases Group

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Background

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