Chlorine dioxide

Density

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

relative density

Type of information:

other: secondary source

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

The information does not come from a test report, and the minimum fields required cannot be filled in. The reference cites only endpoint value as a secondary source, and therefore cannot be assigned as reliable. (details on the identity/composition of the substance not provided)

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

No data.

Type:

relative density

Density:

2.3

Remarks on result:

other: gas density to air

Executive summary:

This publication cites, as a secondary source, some physico-chemical properties for the substance chlorine dioxide, including a density for the gas state to air of 2.3. Details on the composition of the substance are not specified.

Reference 2

Endpoint:

density

Type of information:

other: secondary source

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

The information does not come from a test report, and the minimum fields required cannot be filled in. The reference cites only endpoint value as a secondary source and details on composition not specified. Therefore it cannot be assigned as reliable.

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

No data.

Type:

density

Density:

1.62

Temp.:

11 °C

Remarks on result:

other: at the boiling point

Type:

density

Density:

1.765

Temp.:

-56 °C

Remarks on result:

other: liquid

Executive summary:

This publication cites, as a secondary source, some physico-chemical properties for the substance chlorine dioxide, including densities of the liquid form, from 1.62 at the b.p. to 1.765 at the m.p.. However, details on composition are not specified. 

Reference 3

Endpoint:

density

Type of information:

other: handbook data

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

The information does not come from a test report, and the minimum fields required cannot be filled in (raw data, no experimental details, no details on the composition of the substance). Data comes from a handbook, and therefore cannot be considered as reliable. However, please note that the data source is cited among "reference books containing peer reviewed physico-chemical data" in the ECHA guidance document on information requirements (R7a).

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

No data.

Type:

density

Density:

2.757 g/L

Temp.:

25 °C

Executive summary:

The peer-reviewed CRC Handbook of Chemistry and Physics provides a density of 2.757 g/L (at 25°C) for the substance Chlorine dioxide. Details on the composition of the substance not specified.

Reference 4

Endpoint:

density

Type of information:

other: secondary source

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

The information does not come from a test report, and the minimum fields required cannot be filled in. Data comes from a toxicological profile citing other data sources, and therefore cannot be assigned as reliable. However, please note that the secondary source is considered as peer reviewed.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

No data.

Type:

density

Density:

1.64 g/cm³

Temp.:

0 °C

Remarks on result:

other: liquid

Type:

density

Density:

1.614 g/cm³

Temp.:

10 °C

Remarks on result:

other: liquid

Executive summary:

The peer reviewed ATSDR profile provides density values of 1.640 and 1.614 g/mL, respectively at 0 and 10°C, for the substance Chlorine dioxide, as liquid. However, details on the composition of the substance are not provided.

Reference 5

Endpoint:

relative density

Remarks:

Other density types indicated (relative vapour density)

Type of information:

other: secondary source

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

Data from handbook or collection of data,. They come from a sheet with no reference to data sources, and therefore cannot be assigned as reliable (Details on identity/composition of the substance not provided).

Reason / purpose for cross-reference:

reference to same study

Principles of method if other than guideline:

No data.

Type:

relative density

Density:

1.6

Temp.:

0 °C

Remarks on result:

other: (liquid) (water =1)

Type:

other: relative vapour density

Density:

2.3

Remarks on result:

other: (air = 1)

Executive summary:

The ICSC provides a relative density of 1.6 for the substance Chlorine dioxide, as liquid at 0°C, and a vapour density of 2.3, compared to air. Details on composition of the substance not specified.

Reference 6

Endpoint:

relative density

Remarks:

Density types indicated (density)

Type of information:

other: secondary source

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

The information does not come from a test report, and the minimum fields required cannot be filled in, such as details on the identity/composition of the test substance. Data comes from a book dedicated to chlorine dioxide, compiling very numerous literature references, but few experimental details are provided. Therefore it cannot be assigned as reliable.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

No data.

Type:

density

Density:

2.4

Remarks on result:

other: times heavier than air (gas)

Type:

relative density

Density:

1.64

Temp.:

0 °C

Remarks on result:

other: liquid [Kaczur and Cawlfield 1992]

The gaseous chlorine dioxide can collect in low-lying areas.

Executive summary:

The Simpson's book, dedicated to chlorine dioxide, provides a density of 2.4 as a gas, and 1.64 as a liquid at 0°C but details on composition of the substance are not specified.

Reference 7

Endpoint:

relative density

Remarks:

Other density types indicated (vapour density)

Type of information:

other: secondary source

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

documentation insufficient for assessment

Remarks:

The information does not come from a test report, and the minimum fields required cannot be filled in. Data comes from an online compilation and reviews using secondary data sources, and therefore cannot be assigned as reliable. However, please note that one of the data sources is cited among "reference books containing peer reviewed physico-chemical data" in the ECHA guidance document on information requirements (R7a), and that the endpoint is cited in the HSDB database as peer reviewed, as well as the IRIS review.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Principles of method if other than guideline:

No data.

Type:

relative density

Density:

1.642

Temp.:

0 °C

Remarks on result:

other: (liquid) [1, 4]

Type:

relative density

Density:

1.642

Remarks on result:

other: [2]

Type:

relative density

Density:

1.642

Remarks on result:

other: [3]

Type:

other: vapour density

Density:

2.34

Remarks on result:

other: (air = 1)

Executive summary:

The HSDB database, the international CICAD review, the EPA IRIS review and the OECD SIDS report provide a peer-reviewed relative density of 1.642 for the substance Chlorine dioxide, under its liquid form at 0°C, cited from the Merck Index handbook, and a vapour density of 2.34, compared to air. However, atmospheric pressure and details on composition of the substance are not specified.

Reference 8

Endpoint:

relative density

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is only stable in solution in a particular solvent and the solution density is similar to that of the solvent

Justification for type of information:

The substance as registered is always generated in situ as a gas dissolved in water, with concentration not exceeding 2%. The density of this solution will be, essentially, the same as that of pure water (i.e. d=1). Therefore, a further assessment of the density is scientifically unjustified.

Description of key information

Solution of chlorine dioxine generated in-situ at less than 2% in water (as registered): d = 1 (close to the relative density of water)

Key value for chemical safety assessment

Relative density at 20C:

1

Additional information

The substance as registered is always generated in situ as a gas dissolved in water, with concentration not exceeding 2%. No study was conducted to determine the relative density of the substance considering the relative density of the substance as very close to that of pure water, i.e. d=1. Therefore, a further assessment of the relative density is scientifically unjustified and this data is considered as key data for CSA purpose.

Note that a theoretical relative density of the solution was calculated to be 1.008, based on the data compiled from secondary sources on the pure substance (1.64 g/cm3 for pure ClO2_liq) and considering a 20 g/L solution.

Other information : Several literature sources provide consistent data for the pure chlorine dioxide: a consensus value of 1.64 for Chlorine dioxide liquid at 0°C, and a mean value of 2.35 for the gas, can be retained.