Anthracene oil

Water solubility

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study based on accepted scientific standards

Reason / purpose for cross-reference:

reference to same study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

yes

Remarks:

open test conditions, only one equilibration time

Principles of method if other than guideline:

Preparation of water-accommodated fractions (WAFs) as part of an aqueous toxicity study (short-term toxicity to aquatic invertebrates).

GLP compliance:

yes

Type of method:

flask method

Specific details on test material used for the study:

- Name of test material (as cited in study report): anthracene oil (< 50 ppm BaP)
- Stability under test conditions: WAF (water accommodated fraction) limited
- Storage condition of test material: room temperature, exclusion of light

Key result

Water solubility:

ca. 5 other: mg TOC/L

Conc. based on:

test mat. (dissolved fraction)

Loading of aqueous phase:

100 mg/L

Incubation duration:

24 h

Temp.:

20 °C

pH:

>= 7.9 - <= 8.1

Remarks on result:

other: the water solubility is obtained as mean of two values (3.5 and 7.0 mg TOC /L, main- and pretest) determined as WAF at a loading of 100 mg test material/L

Key result

Water solubility:

ca. 0.5 - ca. 18 other: mg TOC/L

Conc. based on:

test mat. (dissolved fraction)

Incubation duration:

24 h

Temp.:

20 °C

pH:

>= 7.9 - <= 8.1

Remarks on result:

other: the range of water solubilities (WAFs) obtained with test material loadings from 10 to 1000 mg/L

Details on results:

Solubility data relate to loadings of 10 - 1000 mg oil/L (see Remarks on results below).

Water solubility (as water-accommodated fraction) of anthracene oil at 20 °C in test medium (daphnia) at various loadings:

Based on measured data (see tables below), the oil-related TOC values were about

• 0.5 mg/L (at 10 mg oil/L),
• 3.5 and 7.0 mg/L (main- and pre-test) (at 100 mg oil/L),
• 11.0 mg/L (at 500 mg oil/L), and
• 18.0 mg/L (at 1000 mg oil/L)

A. Main test

	Loading [mg/L]
	Control	10	100	500
	WAF [mg TOC/L]
24 h (stirring)	1.0	1.6	4.3	11.8

Note: Values represent TOC including background.

B. Pre-test

	Loading [mg/L]
	Control	100 mg/L	1000 mg/L
	WAF [mg TOC/L]
24 h (stirring)	1.7	8.9	19.4

Note: Values represent TOC including background.

Conclusions:

The water solubility of anthracen oil was determined as WAF at a loading of 100 mg test material/L (measured as TOC). Mean value of two samples was 5 mg TOC/L. The substance can be graded as slightly soluble.

Reference 2

Endpoint:

water solubility

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study based on accepted scientific standards

Reason / purpose for cross-reference:

reference to same study

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 105 (Water Solubility)

Deviations:

yes

Remarks:

open test conditions, only one equilibration time

Principles of method if other than guideline:

Preparation of water-accommodated fractions (WAFs) as part of an aqueous toxicity study (toxicity to aquatic algae).

GLP compliance:

yes

Type of method:

flask method

Specific details on test material used for the study:

- Name of test material (as cited in study report): anthracene oil (< 50 ppm BaP)
- Stability under test conditions: WAF (water accommodated fraction) limited
- Storage condition of test material: room temperature, exclusion of light

Key result

Water solubility:

ca. 0.2 - ca. 2 other: mg TOC/L

Conc. based on:

test mat. (dissolved fraction)

Incubation duration:

24 h

Temp.:

24 °C

pH:

ca. 7.9

Remarks on result:

other: the range of water solubilities (WAFs) obtained with three test material loadings from 2.5 to 50 mg/L

Details on results:

Solubility data relate to loadings of 2.5 - 50 mg oil/L (see Remarks on results below).

Water solubility (as water-accommodated fraction) of Anthracene oil at 23 - 24 °C in test medium (alga) at various loadings:

Based on measured data (see table below), the oil-related TOC values were about

• 0.2 mg/L (at 2.5 mg oil/L),
• 0.7 mg/L (at 10 mg oil/L),
• 2.0 mg/L (at 50 mg oil/L).

Measured data:

	Loading [mg/L]
	Control	2.5	10	50
	WAF [mg TOC/L]
24 h (stirring)	0.4	0.6	1.1	2.4

Note: Values represent TOC including background.

Conclusions:

The water solubility of anthracene oil was determined as WAF (measured as TOC) at three different loadings (2.5, 10, and 50 mg test material/L). Aqueous concentrations were 0.2, 0.7, and 2 mg TOC/L. The substance can be graded as slightly soluble.

Description of key information

The water-soluble fraction (WSF) of anthracene oil (CCSG composite sample 07) (anthracene oil with < 50 ppm BaP, AOL), measured as TOC, was found to range between 3.5 and 7.0 mg C/L at ambient temperature (at a loading of 100 mg oil/L). The mean water solubility is estimated to be 5 mg C/L.

Key value for chemical safety assessment

Water solubility:

5 mg/L

at the temperature of:

20 °C

Additional information

Loadings of 500 and 1000 mg oil/L were also tested. The WSF, measured as TOC, were ca. 11 mg C/L and 18 mg C/L, respectively. Lower loadings (2.5, 10, and 50 mg oil/L), applied in a different test (algae test), resulted in WAFs of 0.2, 0.7, and 2 mg C/L.

As standard, the WSF of a loading of 100 mg oil/L is selected in order to characterise the water solubility of anthracene oil.