Sodium (S)-lactate

Viscosity

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

viscosity

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

1941-11

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Justification for type of information:

For justification of read-across please refer to the read-across report attached to IUCLID section 13.

Reason / purpose for cross-reference:

read-across source

Key result

Temp.:

other: 25 °C

Parameter:

dynamic viscosity (in mPa s)

Value:

379.8

Remarks on result:

other: Dynamic viscosity for 70 % (w/w) aqueous solution.

The following aqueous solutions of sodium lactate were investigated:

% (w/w) Na - lactate	dynamic viscosity [mPa*s]
1%	0.93
2%	0.96
5%	1.06
10%	1.24
20%	2.04
30%	3.64
40%	7.29
50%	17.98
60%	55.06
70%	379.9

Conclusions:

The dynamic viscosities of different concentrated aqueous solutions of potassium lactate were determined by the capillary method. The highest tested concentration which is 70% w/w sodium lactate in water showed a dynamic viscosity of η = 379.9 mPa × s.

Executive summary:

In an experimental study, comparable to an OECD 114, the dynamic viscosities of different aqueous solutions of soidum lactate were determined using the capillary method. Crystalline sodium lactate is hygroscopic and extremely difficult to isolate, thus it only manufactured and marketed as a concentrated aqueous solution.

The dynamic viscosities for the different sodium lactate concentrations in water were determined at 25°C. The highest tested concentration, which is 70% w/w sodium lactate in water showed a dynamic viscosity of η = 379.9 mPa × s. 

 

This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.

 

Reference 2

Endpoint:

viscosity

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is a solid

Description of key information

In an experimental study conducted comparable to an OECD 114, the dynamic viscosities of different aqueous solutions of Sodium lactate were determined using the capillary method. Crystalline Sodium lactate is hygroscopic and extremely difficult to isolate, thus it only manufactured and marketed as a concentrated aqueous solution.

The dynamic viscosities for the different sodium lactate concentrations in water were determined at 25 °C. The highest tested concentration of 70% w/w Sodium lactate in water showed a dynamic viscosity of η = 379.9 mPa × s. 

Sodium (S)-lactate is marketed as concentrated aqueous solution. Based on the test item's solubility in water (see IUCLID section 4.8)  the read-across results of aqueous Sodium lactate solutions (70 % (w/w)) can be considered representative. By extrapolating the existing data, it can be assumed that higher concentrations lead to higher dynamic viscosities.

Key value for chemical safety assessment

Viscosity:

379.9 mPa · s (dynamic)

at the temperature of:

25 °C