Carbon tetrachloride

Distribution modelling

Administrative data

Endpoint:

distribution modelling

Type of information:

calculation (if not (Q)SAR)

Remarks:

Migrated phrase: estimated by calculation

Adequacy of study:

supporting study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: Only abstract and secondary source available

Data source

Reference

Reference 1

Reference Type:

publication

Title:

Behavior Assessment Model for Trace Organics in Soil: III. Application of Screening Model

Author:

Jury WA, Spencer WF, Farmer WJ

Year:

1984

Bibliographic source:

J Environ Qual 13:573-9 http://jeq.scijournals.org/cgi/content/abstract/13/4/573

Reference 2

Reference Type:

publication

Title:

Behavior Assessment Model for Trace Organics in Soil: I. Model Description

Author:

Jury WA, Spencer WF, Farmer WJ

Year:

1983

Bibliographic source:

J Environ Qual 12:558-564 http://jeq.scijournals.org/cgi/content/abstract/12/4/558

Reference 3

Reference Type:

secondary source

Title:

Environmental Health Criteria 208 CARBON TETRACHLORIDE

Author:

de Fouw J

Year:

1999

Bibliographic source:

ISBN 92 4 157208 6, ISSN 0250-863X, self-published WHO, Geneva, Switzerland, 199p http://www.inchem.org/documents/ehc/ehc/ehc208.htm

Materials and methods

Model:

other: according to Jury et al (1983)

Media:

other: soil-air

Test material

Test material information

Constituent 1

Reference substance name:

Carbon tetrachloride

EC Number:

200-262-8

EC Name:

Carbon tetrachloride

Cas Number:

56-23-5

Molecular formula:

CCl4

IUPAC Name:

tetrachloromethane

Applicant's summary and conclusion

Executive summary:

The soil chemical screening model developed in Jury et al. (1983) is applied to a set of 35 chemicals for which benchmark properties(organic C partition coefficient, vapor pressure, solubility,half-life) have been obtained. Environmental screening tests are conducted on the chemicals to determine their relative convective mobility, diffusive mobility, volatility, and persistence with the results presented in a series of classifications ratingthe susceptibility of the chemical to a given loss pathway.

The convective mobility tests estimate the time required fora pulse of chemical to travel a distance of 10 cm through anideal soil of uniform water content and organic C content whilebeing subjected to a water application rate of 1 cm/day. Thediffusive mobility tests determine the time required for a chemicalto diffuse 10 cm through the same ideal soil. In the volatilization screening tests, each chemical is applied at a uniform concentrationof 1 kg/ha to a standard depth in the soil with uniform propertiesand is allowed to volatilize through a stagnant air boundarylayer during a specified time period in the presence or absenceof water evaporation. The resulting volatilization fluxes andcumulative losses for a standard time period are used to categorizethe relative susceptibility of the chemical to loss to the atmosphere.The persistence tests are used to determine the amount of chemical left after a specified time period when it is free not onlyto degrade but also to volatilize.

Jury et al. (1984) predicted that CTC would have a volatilization half-life of 0.2 days at a depth of 1 cm and 0.8 days at a depth of 10 cm in soil, based on volatilization tests and assuming a uniform distribution of the chemical with depth.