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PBT assessment

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PBT assessment: overall result

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Name:
Potassium cyanide < 0.5% KOH_BC
Type of composition:
boundary composition of the substance
State / form:
solid: bulk
Reference substance:
Composition 1
Name:
Potassium cyanide 0.5%-2% KOH_BC
Type of composition:
boundary composition of the substance
State / form:
solid: bulk
>= 95 - <= 100 % (w/w)
Reference substance:
Composition 1
Reference substance:
Composition 1
This impurity is considered relevant for the classification and labelling of the substance
Name:
Potassium cyanide >2% KOH_BC
Type of composition:
boundary composition of the substance
State / form:
solid: bulk
>= 95 - <= 100 % (w/w)
Reference substance:
Composition 1
Reference substance:
Composition 1
This impurity is considered relevant for the classification and labelling of the substance
PBT status:
the substance is not PBT / vPvB
Justification:

Cyanides are acutely and chronically toxic to aquatic organisms and to mammals. The No Adverse Effect Level is 0.001 mg/L in fish; the same concentration is the No Adverse Effect Concentration in algae. However, the cyanides have been demonstrated to be inherently biodegradable after a period of adaptation by the micro-organisms, and thus do not meet the PBT and vPvB criteria for persistence. Furthermore, cyanides have a log Kow less than 1 and bioconcentration factor (BCF) of approximately 3; therefore, cyanides are not considered to be bioaccumulative.

The cyanides have been carefully reviewed by previous authoritative bodies, and have been listed in Annex 1 of the Dangerous Substances Directive. According to Regulation (EC) No. 1272/2008, Annex VI, Table 3.1, Index No. 006 -007 -00 -5, concerning PBT/vPvB: "All category members, including potassium cyanide and sodium cyanide, are excluded as they are not persistent nor bioaccumulative." Thus, potassium cyanide is not a PBT or a vPvB.