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EC number: 205-443-5 | CAS number: 140-93-2
Endpoint summary
Administrative data
Description of key information
Additional information
Expert Judgement
When water is added to Sodium Isopropyl Xanthate (SIPX) it reacts with water to form the others substances: alcohol, sodium carbonate, trithiocarbonate and carbon disulphide.
Carbon disulphide (CAS number 75–15–0) it is the major decomposition product, which is liquid and have to be considered.
The biodegradation of CS2 was >80 % after 28 days of exposure, therefore CS2 is readily biodegradable. Sodium Isopropyl Xanthate (SIPX) readily decomposes to carbon disulphide, especially in the presence of moisture/water.
Therefore, the Biodegradation in water of carbon disulphide (CS2) need to be considered in the assessment of Sodium Isopropyl Xanthate (SIPX).
A BOD5/COD ratio ≥ 0.5 is for Isopropyl Alcohol and it is considered as indicative of rapid degradation. Thus, a substance which passes this screening test is considered likely to biodegrade 'rapidly' in the aquatic environment, and is thus unlikely to be persistent.
Sodium Isopropyl Xanthate (SIPX) readily decomposes to Isopropyl Alcohol, especially in the presence of moisture/water. Isopropyl Alcohol is both reagents used in the manufacture, as well as decomposition products.
Therefore, the Biodegradation in water of Isopropyl Alcohol need to be considered in the assessment of Sodium Isopropyl Xanthate (SIPX).
Based on the results of the study of Chen 2010, Sodium Isopropyl Xanthate (SIPX) is readily biodegradable: 63.37 % was degraded in 8 days (at initial pH 7.4 and 25 oC). The calculated half-life (t1/2) was 4.6 d.
The biodegradation extent of several alkyl xanthate collectors has been determined according to ISO 7827 and the kinetic model of biodegradation has been discussed.
The results indicated that the biodegradation extent of ethyl xanthate, n-butyl xanthate, n-amyl xanthate, isopropyl xanthate and iso-butyl xanthate can attain 96.36%, 81.76%, 73.74%, 63.37% and 60.30%, respectively in 8d. The rate constants (k) follows the order of: kethyl>kn-butyl>kn-amyl>kisopropyl>kisobutyl
These results suggest that Sodium Isopropyl Xanthate (SIPX) will be readily biodegradable and it is not expected to persist in the environment.
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