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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Classification & Labelling & PBT assessment

PBT assessment

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Administrative data

PBT assessment: overall result

Carbonodithioic acid, O-(2-methylpropyl) ester sodium salt
Type of composition:
legal entity composition of the substance
State / form:
solid: bulk
Reference substance:
Carbonodithioic acid, O-(2-methylpropyl) ester sodium salt
PBT status:
the substance is not PBT / vPvB


Sodium ethyl xanthate (CAS# 140-90-9) is readily biodegradable

Simulating test water, sediment (Analytical Department of Institute of Heavy Organic Synthesis "BLACHOWNIA", 2012, Kędzierzyn-Koźle, Poland; GLP certificate no. 4/2010/DPL).KS;Reliability 1; robust study summary available; Data owner – MINOVA-KSANTE Sp. z o.o.

Method: Dissolved Organic Carbon (DOC) Die-Away,(Regulation EC No 440/2008, method C.4-A)

A measured volume of inoculated mineral medium containing a known cocentration of the test substance (10-40 mg/l) as a source of organic carbon is aerated in the dark or diffused light at 22 +/- 20C. Degradation is followed by DOC analysis at frequent intervals over 28-day period.

After 28 days biodegradation of sodium ethyl xanthate: D28days= 100+/_1.4%

The above results indicate that sodium ethyl xanthate (CAS# 140-90-9) is ready biodegradable - pass level, according to OECD 301:

-          pass value in the 10 day window (form 1 day to 11 day)is 89% removal of DOC,



 Partition coefficient n-octanol/water.

Experimental result.Shake flask method according to A.8, EC No.440/2008 and OECD 107(Institute of Industrial Organic Chemistry, Active Ingredients Synthesis and Technology Department, GLP Compliance No 8/2011/DPL).

Calculated values of sodium ethyl xanthate (CAS# 140-90-9)partition coefficient 1-octanol/water


          Vial number







Volume 1-octanol phase/volume of water phase




Pow= C1-octanol/Cwater







log Pow= log(C1-octanol/Cwater)







Average log Pow+ standard deviation




Average log Pow+ standard deviation



Partition coefficient n-octanol/water of sodium ethyl xanthate (CAS# 190-90-9) is very low.

BCFWIN - Arnold-Gobas BCF&BAF methods (including biotransformation rate estimates for fish)(US EPA. 2011. Estimation Program Interface Suite for Microsoft Windows v 4.10 United States Environment Protection Agency ,Washington ,DC, USA,

 (file://C:\(x86)Common Files\QSAR Toolbox\Ver2.2\config)

BAF =1.397dm3/kg wet-wtupper trophic


PBT Profiler Estimate (

The estimated bio-concentration factors:

sodium ethyl xanthate:                             BCF = 3.2

Very low values of: Experimental result of log Pow, estimated values of BAF (Bio-accumulation Factor) and BCF (Bio-concentration Factor) indicate that bio-accumulation of sodium ethyl xanthate (CAS# 140-90-9) is unlikely.


Predicted no effect concentration – PNEC = 0,001mg/dm3in water.

Canadian Centre for Occupational Health and Safety, 2010 ; Registry for Toxic Effects of Chemical Substances

According to REACH criteria Sodium ethyl xantate (CAS# 140-90-9) should be consider as very toxic for aquatic environment .