Hazardous and Noxious Substances Spill Incidents

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On this database it is collected information on the fate and weathering of hazardous and noxious substances (HNS) accidentally spilt at the sea around the world. It gathers and systematizes existing information to assist stakeholders involved in spill preparedness and response, and builds return of experience datasheets for the chemicals involved. It will facilitate the incorporation of lessons from past incidents on the decision process to improve preparedness.

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HNS Spilt

Phosphoric acidSolid


Amount Spilt (T)10000

CAS Number7664-38-2


Physical Behaviour (SEBC code)


Pollution Category (MARPOL Annex 2)


Class according to IMDG code


Subsidiary Risk Class according to IMDG code

Classification as Marine Pollutant

ii, iii

HNS Classification (2010 HNS Convention)

Fate and weathering facts observed/reported

The vessel sunk 70 m deep in international waters. Phosphoric acid was released under controlled conditions. Phosphoric acid is a corrosive liquid. The main risk for marine life is essentially irritation and burns in case of contact. The environmental impact would have been much localized: phosphoric acid leaking would have acidified the immediate surroundings of the wreck and be quickly neutralized around.

Material Safety Data Sheets (MSDS)