Reaction mass of 4,4'-isopropylidenediphenol and phenol

Adsorption / desorption

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 121 (Estimation of the Adsorption Coefficient (Koc) on Soil and on Sewage Sludge using High Performance Liquid Chromatography (HPLC))

Qualifier:

according to guideline

Guideline:

OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)

GLP compliance:

not specified

Type of method:

other: Comparison of OECD 121 and OECD 106

Media:

soil

Type:

Koc

Value:

> 14 - < 73

Details on results (HPLC method):

using HPLC method the Koc values were between 38 and 72 L/kg

Adsorption and desorption constants:

using batch equilibrium method the Koc values were between 14 and 26 L/kg

Determination of the soil sorption coefficient in 4 soils
with a phenol concentration of 4.91 mg/l

soil type       Borstel      Euro-      Euro-      Euro-   
                             soil 2     soil 3     soil 4
sand (%)          73         13.4       46.4       4.1
silt (%)          22         64.1       36.8      75.7
clay (%)           7.2       22.6       17.0      20.3
pH value           5.7        7.5        5.2       6.5
Corg (%)           1.6        3.7        3.5       1.6
CEC                1.6       28.3       18.3      17.5
(Mval/100 g)

Koc               22         26          21       14

    

Koc values calculated via capacity factor, capacity factor
determined via HPLC on 
a. cyanopropyl column
log Koc=1.67, Koc=46.8 (log Koc= 2.3 log k' + 2.72;
regression equation derived from test set A consisting of
substances of different chemical classes without
pesticides),
log Koc=1.58, Koc=38 (log Koc= 2.16 log k' + 2.57;
regression equation derived from test set A and pesticides),
k' (capacity factor)= 0.35

b. RP 18 columns
log Koc=1.86, Koc=72 (log Koc= 0.9 log k' + 2.08; regression
equation derived from test set A),
k' (capacity factor)= 0.57

Conclusions:

batch: very low sorption
HPLC: very low to low sorption
calculated: low sorption

Executive summary:

The soil sorption coefficient (Koc values) for phenol was measured in four different soils. The soils cover a big variability with respect to sand (4% to 73%), silt (22% to 76%), clay (7% to 23%), organic carbon (1.6% to 3.7%), and pH (5.2 to 7.5). The soil sorption coefficients (Koc values) for phenol which are described in this study are located within the range 14.0 L/kg to 26 L/kg. In addition to the batch equilibrium studies the Koc was determined using the HPLC-method resulting in Koc values between 38 L/kg and 73 L/kg.

On the basis of the logPow value (measured logPow value for phenol (1.47), in accordance with the TGD, the Koc value is calculated as 82.8 l/kg. The calculated Koc value is located within the range of the experimentally determined values and is taken into account in the further considerations.

Reference 2

Endpoint:

adsorption / desorption: screening

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)

GLP compliance:

not specified

Type of method:

batch equilibrium method

Media:

soil

Test temperature:

25 °C

Duration:

24 h

Initial conc. measured:

> 0.009 - < 94 other: ng/kg

pH:

5.4

Temp.:

25

Type:

Koc

Value:

39 - < 91

Conclusions:

The soil sorption coefficients (Koc values) for phenol which are described in this study are located within the range 39.0 L/kg to 91 L/kg.
On the basis of the logPow value (measured logPow value for phenol (1.47), in accordance with the TGD, the Koc value is calculated as 82.8 l/kg indicating moderately sorption to soil.

Executive summary:

The soil sorption coefficients (Koc values) for phenol was measured in two soils with contents of sand of 17% and 33%, silt of 55% and 59%, clay of 12% to 24%, organic matter of 1.1% and 3.6%, and pH of 5.4. The soil sorption coefficients (Koc values) for phenol which are described in this study are located within the range of 39 L/kg to 91 L/kg. On the basis of the logPow value (measured log Pow value for phenol (1.47), in accordance with the TGD, the Koc value is calculated as 82.8 l/kg. The calculated Koc value is located within the range of the experimentally determined values and is taken into account in the further considerations.

Description of key information

Data on the sorption of phenol in soil is presented in the EU-RAR (2006) in Section 3.1.2.1.2.

It is stated that a value of 82.8 L/kg can be considered for the Koc.

 

The soil sorption coefficient (Koc values) for phenol was measured in four different soils. The soils cover a big variability with respect to sand (4% to 73%), silt (22% to 76%), clay (7% to 23%), organic carbon (1.6% to 3.7%), and pH (5.2 to 7.5). The soil sorption coefficients (Koc values) for phenol which are described in this study are located within the range 14.0 L/kg to 26 L/kg. In addition to the batch equilibrium studies the Koc was determined using the HPLC-method resulting in Koc values between 38 L/kg and 73 L/kg. On the basis of the log Pow value (measured log Pow value for phenol: 1.47), in accordance with the TGD, the Koc value is calculated as 82.8 l/kg. The calculated Koc value is located within the range of the experimentally determined values and is taken into account in the further considerations.

Key value for chemical safety assessment

Koc at 20 °C:

82.8

Additional information

The environmental properties of the reaction mass of phenol and 4,4’-isopropylidenediphenol was assessed by examination of the properties of the constituents and impurities of the mixture and using this information in a read across approach as described in section 13.