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TERRESTRIAL FATE:

 S-allyl O-pentyl dithiocarbonate is used in the mining industry as flotation agents as a fine collector for metallic copper, molybdenite, and sulfidized base metal oxides. 
The amount of S-allyl O-pentyl dithiocarbonate used is very small relative to the quantity of ore treated, being approximately 2 to 50 g/tonne of ore.

 

The flotation process is fully automated. The process takes place in open tanks. However, the concentration of S-allyl O-pentyl dithiocarbonate in the flotation tank is low and, therefore, the release of Carbon monoxide; carbon dioxide; oxides of nitrogen; oxides of sulphur (includes sulphur di and tri oxides) would be expected to be low.

Air monitoring data, although limited and of poor quality, indicate that the atmospheric levels of carbon dioxide; oxides are below 10 ppm in the flotation areas. The risk to workers during the flotation process is considered to be low.

 

S-allyl O-pentyl dithiocarbonate was hydrolytically stable (half life > 1 year) specified by the OECD Guidelines. This substance has a limited potential to bioaccumulate (based on log Kow used by BCF estimates: 73.06 and predicted bioconcentration factors, log BCF = 1.864 (EPIWIN/BCF Program).

 

S-allyl O-pentyl dithiocarbonate is not expected to contaminate the environment where ore tailings are confined to well constructed tailings dams. Most will be retained on sulphide minerals and destroyed when they are dried after flotation. Minor residues that remain associated with tailings will be destroyed by hydrolysis intailings dams.

 

The log of the adsorption coefficient (KOC) of S-allyl O-pentyl dithiocarbonate was estimated to be log KOC = 2.1858 which is equal to a KOC value of 153.4 using the KOCWIN v2.00 QSARmethod. This value indicates that S-allyl O-pentyl dithiocarbonate will be adsorbed by organic carbon in soil.

S-allyl O-pentyl dithiocarbonate can be classified to be of very high mobility in soil according these results and does not have a high potential for adsorption to soil. S-allyl O-pentyl dithiocarbonate adsorbs strongly to sulphide minerals but has less affinity for surfaces in general. The KOC value of 153.4 also suggest this conclusion.

The estimated Henrys Law Constant (25 deg C) measured by calculation from EPI SuiteTM v4.1, HENRYWIN v3.20 Program was 1.425E-005 atm-m3/mole  (1.444E+000 Pa-m3/mole).

This is Exposure Assessment Tools and Models made from EPA (Environmental Protection Agency).

   

Xanthates and xanthate estershave not been subjected to regulatory action in any country.The chemical is not listed on the Hazardous Substances Information System (HSIS) .No known restrictions have been identified.

 S-allyl O-pentyl dithiocarbonate is used in the mining industry as flotation agents as a fine collector for metallic copper, molybdenite, and sulfidized base metal oxides. 
The amount of S-allyl O-pentyl dithiocarbonate used is very small relative to the quantity of ore treated, being approximately 2 to 50 g/tonne of ore.

 

The flotation process is fully automated. The process takes place in open tanks. However, the concentration of S-allyl O-pentyl dithiocarbonate in the flotation tank is low and, therefore, the release of Carbon monoxide; carbon dioxide; oxides of nitrogen; oxides of sulphur (includes sulphur di and tri oxides) would be expected to be low.

Air monitoring data, although limited and of poor quality, indicate that the atmospheric levels of carbon dioxide; oxides are below 10 ppm in the flotation areas. The risk to workers during the flotation process is considered to be low.

 

 Concentrations of S-allyl O-pentyl dithiocarbonate likely to be found in the tailings slurry may be moderately toxic to aquatic fauna. Such waste streams should therefore not be discharged to waterways.

When suitable precautions are taken to avoid entry of tailings to waterways, the environmental risk of S-allyl O-pentyl dithiocarbonate can be described as minimal in view of the low environmental exposure and limited persistence.

 

 

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