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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Chocolate Bay (Barge MGM 3030)


USA - Texas

Rest of the world


HNS Spilt

Sulphuric acidLiquid


Amount Spilt (T)2000

CAS Number7664-93-9


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

Chocolate Bay is a natural reserve area of marshlands in Texas. Leaks of 1,300 m3 of the cargo resulted in a strong decrease in pH (as low as pH 2) around the barge but the environmental impact was short-lived.

Material Safety Data Sheets (MSDS)