Guanidinium nitrate

Partition coefficient

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1988-09-15 to 1988-09-16

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)

GLP compliance:

yes

Type of method:

flask method

Partition coefficient type:

octanol-water

Analytical method:

photometric method

Key result

Type:

log Pow

Partition coefficient:

< -1.7

Temp.:

20 °C

pH:

ca. 7.4

Details on results:

The analytic procedure as outlined in section 3.4 was found to be linear between 120 µg/ml and 10 µg/ml and its detection limit was found to be 5 µg/ml (see RCC NOTOX study 0917/C608).
Concentrations of test substance in buffer and n-octanol samples were calculated using the absorbance coefficient at 480 nm in Milli-Q

An overall partition coefficient of < 0.02 was calculated. Expressed as its logarithm (base 10), the mean partition coefficient is <-1.70; individual values fall within the range of ± 0.3 log units and therefore meet the quality criterion. Temperature of measurement was 20 ± 1°C.

Conclusions:

In the study performed according to OECD107, adopted May 12, 1981 the partition coefficient (n-octanol/water) for Guanidine Nitrate was determined to be < 0.02 (log Pow: < -1.70) at 20 ± 1°C.

Executive summary:

In the study performed according to OECD107, adopted May 12, 1981 the partition coefficient (n-octanol/water) for Guanidine Nitrate was determined to be <0.02 (log Pow: <-1.70) at 20 ± 1°C.

Reference 2

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

1. September1988 - 15. September 1988

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Justification for type of information:

Supporting information for read-across, structural analogue approach.

Qualifier:

according to guideline

Guideline:

OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)

Version / remarks:

adopted May 12, 1981

GLP compliance:

yes

Type of method:

shake-flask method to: flask method

Partition coefficient type:

octanol-water

Analytical method:

photometric method

Key result

Type:

Pow

Partition coefficient:

< 0.02

Temp.:

20 °C

pH:

7.4

Key result

Type:

log Pow

Partition coefficient:

< -1.7

Temp.:

20 °C

pH:

7.4

From the preliminary test a partition coefficient of 0.07 was calculated (test substance concentrations of 5 microg/ml (detection limit) and 69 microg/ml were calculated for the n-octanol and buffer phase, respectively).

The analytical procedure as outlined in section 3.4 was found to be linear between 120 microg/ml and 10 microg/ml and its detection limit was found to be 5 microg/ml The test substance was determined to be stable for at least 4 hours in Milli-Q water (results not shown).

Concentrations of test substance in buffer and n-octanol samples were calculated using the absorbance coefficient at 480 nm in Milli-Q.

An overall partition coefficient of < 0.02 was calculated. Expressed as its logarithm (base 10), the mean partition coefficient is < -1.70; individual values fall within the range of ± 0.3 log units and therefore meet the quality criterion. Temperature of measurement was 20 ± 1°C. pH values of the water phases are shown in Table 1; pH of the buffer solution was 7.4.
 In conclusion, the partition coefficient (n-octanol/water) for Guanidine Hydrochloride was determined to be < 0.02 (log pow: < -1.70) at 20 ± 1°C.

Conclusions:

In a test according to OECD 107, Guanidine hydrochloride showed a log Kow < -1.70 (20 °C, pH 7.4).

Executive summary:

In a test according to OECD 107, Guanidine hydrochloride showed a log Kow < -1.70 (20 °C, pH 7.4).

Description of key information

The partition coefficient (n-octanol/water) of Guanidine Nitrate was determined to be <0.02 (log Pow: <-1.70) at 20 ± 1°C

Key value for chemical safety assessment

Log Kow (Log Pow):

-1.7

at the temperature of:

20 °C

Additional information

In the study performed by RCC NOTOX (1988) the partition coefficient (n-octanol/water) for Guanidine Nitrate was determined to be <0.02 (log Pow: <-1.70) at 20 ± 1°C. The study was performed according to OECD107, adopted May 12, 1981. To enable functionalities within Chesar v.1.2, the partition coefficient (here being out of range with a value of logKow of -1.7) was set to the minimum value of the range advised by the implemented EUSES program, i.e. to >-1.

Additional supporting data from the read-across substance guanidine chloride were included to demonstrate the similar physico-chemical profile of both substances, used to substantiate the justification for read-across, outlined in chapter 13 of technical dossier.