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PBT assessment

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PBT assessment: overall result

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Name:
Reaction mass of ethanol and sodium O-ethyl dithiocarbonate and sodium hydroxide
Type of composition:
boundary composition of the substance
State / form:
solid: bulk
Reference substance:
Composition 1
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Composition 1
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Composition 1
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Composition 1
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Composition 1
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Reference substance:
Composition 1
Name:
Reaction mass of ethanol and sodium O-ethyl dithiocarbonate and sodium hydroxide
Type of composition:
legal entity composition of the substance
State / form:
solid: bulk
Related composition:
Composition 2
Reference substance:
Composition 1
Reference substance:
Composition 1
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Composition 1
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Composition 1
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Composition 1
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Composition 1
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Composition 1
Reference substance:
Composition 1
PBT status:
the substance is not PBT / vPvB
Justification:

When water is added to Reaction mass of SEX it reacts with water to form the others substances: alcohol, sodium carbonate, trithiocarbonate and carbon disulphide because of its high water solubility.

Hydrolysis will be a significant factor in determining the environmental fate of Reaction mass of SEX. In neutral or mildly alkaline solutions, Reaction mass of SEX decomposes to the alcohol, carbon disulphide, sodium carbonate and sodium trithiocarbonate, the two salts arising from neutralisation of carbon disulphide with the sodium hydroxide liberated. In more strongly alkaline media, hydrogen sulphide is liberated. However, strongly alkaline conditions are unlikely to be encountered under the conditions of use in the mining industry. The half-life at pH 7 at 25°C is reportedly about 260 hours, increasing to over 500 hours in the pH range 8 to 11.

Reaction mass of SEX is hydrolytically unstable when exposed to acidic conditions, reverting rapidly to ethanol, carbon disulphide and sodium hydroxide, and therefore will not persist in the acidic environment of tailings dams. If discharged to waterways, the chemical would be likely to persist for at least some days, hydrolysing only slowly in this more neutral environment. However, it is not expected to bioaccumulate in view of its ionic character

Reaction mass of SEX does not fulfil the criteria for persistency, bioaccumulation and toxicity as laid down in the TGD (EC, 2003). Therefore, this substance is not consideredon PBT or vPvBsubstance.