Methoxyammonium chloride

Partition coefficient

Administrative data

Endpoint:

partition coefficient

Type of information:

(Q)SAR

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with limited documentation / justification

Data source

Reference

Reference 1

Reference Type:

other: Estimation software

Title:

Estimation Programs Interface (EPI) Suite for Microsoft Windows, v4.11

Author:

US-EPA

Year:

2021

Bibliographic source:

United States Environmental Protection Agency, Washington, DC, USA. Copyright 2000-2012

Reference 2

Reference Type:

other company data

Title:

Unnamed

Year:

2023

Report date:

2023

Materials and methods

Test guideline

Qualifier:

no guideline required

Principles of method if other than guideline:

Estimation of log Kow using KOWWIN v1.68

GLP compliance:

no

Type of method:

calculation method (fragments)

Partition coefficient type:

octanol-water

Test material

Test material information

Constituent 1

Reference substance name:

Methoxyammonium chloride

EC Number:

209-798-7

EC Name:

Methoxyammonium chloride

Cas Number:

593-56-6

Molecular formula:

CH5NO.ClH

IUPAC Name:

methoxyammonium chloride

Constituent 2

Test material form:

solid: crystalline

Details on test material:

- Name of test material (as cited in study report): Hydroxylamine, o-methyl-, hydrochloride

Results and discussion

Partition coefficient

Type:

log Pow

Partition coefficient:

-1.84

Temp.:

25 °C

Remarks on result:

other: The substance is within the applicability domain of the model.

Any other information on results incl. tables

TYPE | NUM |       LOGKOW FRAGMENT DESCRIPTION        | COEFF | VALUE

-------+-------+-----------------------------------------------------------+----------+--------

Frag  | 1  | -CH3   [aliphatic carbon]                | 0.5473  | 0.5473

Frag  | 1  | -O-N [oxygen, nitrogen attach]         | 0.2352  | 0.2352

Frag  | 1  | Halogen {-CL,-Br,-F,-I} [Nitrogen attach] | 0.0001  | 0.0001

Frag  | 1  | >N< [+5 valence; single bonds; H attach]  |-4.6000  | -4.6000

Frag  | 1  | {-O- or -S-} to nitrogen (+5 valence)]    | 1.7500**| 1.7500

Const|     | Equation Constant                         |         | 0.2290

NOTE |    | An estimated coefficient (**) used                 |

-------+-----+--------------------------------------------+---------+--------

Log Kow  = -1.8384

Applicant's summary and conclusion

Executive summary:

QPRF: KOWWIN v1.68 (01 Nov. 2013)

 

1.	Substance	See “Test material identity”
2.	General information
2.1	Date of QPRF	See “Data Source (Reference)”
2.2	QPRF author and contact details	See “Data Source (Reference)”
3.	Prediction
3.1	Endpoint (OECD Principle 1)	Endpoint	Octanol-water partition coefficient (log Kow)
		Dependent variable	Octanol-water partition coefficient (log Kow)
3.2	Algorithm (OECD Principle 2)	Model or submodel name	KOWWIN
		Model version	v. 1.68
		Reference to QMRF	QMRF: Estimation of Octanol-Water Partition Coefficient using KOWWIN v1.68 (EPI Suite v4.11)
		Predicted value (model result)	See “Results and discussion”
		Input for prediction	Chemical structure via CAS number or SMILES
		Descriptor values	- Chemical structure - Fragments - Correction factors
3.3	Applicability domain (OECD principle 3)	Domains:
		1) Molecular weight (range of test data set: 18.02 to 719.92 g/mol; On-Line KOWWIN User’s Guide, Ch. 6.2.3 Estimation Domain)	Substance (not) within range (83.52 g/mol)
		2) Fragments: Number of instances of the identified fragments does not exceed the maximum number as listed in Appendix D (On-Line KOWWIN User’s Guide)	fulfilled
		3) Fragments: Substance has a functional group(s) or other structural features not represented in the training set, and for which no fragment coefficient was developed (Appendix D, On-Line KOWWIN User’s Guide)	applicable
		4) Correction factors: Number of instances of the identified correction factor does not exceed the maximum number as listed in Appendix D (On-Line KOWWIN User’s Guide)	fulfilled
3.4	The uncertainty of the prediction (OECD principle 4)	According to REACH Guidance Document R.7a, (Nov. 2012), solubility in water is difficult to model accurately. For this reason, as well as the fact that the experimental error on solubility measurements can be quite high (generally reckoned to be about 0.5 log unit), the prediction of aqueous solubility is not as accurate as is the prediction of octanol/water partitioning.
3.5	The chemical mechanisms according to the model underpinning the predicted result (OECD principle 5)	The water solubility of a substance depends on its affinity for water as well as its affinity for its own crystal structure. In general, substances with high melting points have poor solubility in any solvent.

 

References

- US EPA (2012). On-Line KOWWIN User’s Guide.