Hazardous and Noxious Substances Spill Incidents

Advanced Search

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.

Read Documents

Frank Michael


Baltic Sea



HNS Spilt

Ammonium dihydrogen phosphateSolid


Amount Spilt (T)1100

CAS Number7722-76-1


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


HNS Classification (2010 HNS Convention)

Fate and weathering facts observed/reported

This non-toxic solid fertilizer started to escape and dissolve in the surrounding water. It is a nutrient for algae and thus a severe oxygen consumer. A discussion started among responsible Swedish agencies regarding the need for actions to salve the cargo. The total yearly emission of similar chemicals into the Baltic Sea amounts to millions of tons, compared to the ship’s cargo content of 1,100 tons. The cargo escaped into the sea over the weeks following that accident, has weather got worse. The time of the year and favourable water turnover in the area reduced the risk for the environment and no mitigation action was taken.

Material Safety Data Sheets (MSDS)