L-(+)-lactic acid

Viscosity

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

viscosity

Type of information:

other: expert statement

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Principles of method if other than guideline:

Overview of different determinations

GLP compliance:

no

Type of method:

other: Übbelohde viscosimeter (dynamic) compared to handbook data

Standard covering the apparatus used:

In this expert statement the results of the experimental study conducted by Korevaar (1996) and the data presented in the handbook by Holten, 1971 are summarized. The viscosity was measured by Korevaar by using a Übbelohde viscosimeter.

Specific details on test material used for the study:

DIfferent concentrations of aqueous solutions of lactic acid

Temp.:

other: 25.0°C

Parameter:

other: cP

Value:

18.4

Remarks on result:

other: 80 % w/w solution of lactic acid

Result: Concentration: 88.6 %. Result: 36.9 mP s at 25 °C

Conclusions:

The value found by PURAC at 80 % and 25 °C matches with the values reported in Holten (75.33 % lactic acid at 25 °C, 13.03 cP and 85.32 % at 25 °C, 28.5 cP). The values of 18.4 cP at 80 % and 25 °C and 36.9 cP at 88.6 % and 25 °C are relevant.

Executive summary:

In a PURAC internal report the viscosity of lactic acid at various concentrations and temperatures is given. Measurement is done by Übbelohde viscosimeter. Temperatures varied between 25 °C and 80 °C, concentrations between 20 and 80 %. An 80 % solution has a viscosity of 18.4 cP at 25 °C.

Reference 2

Endpoint:

viscosity

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

1996

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

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

Principles of method if other than guideline:

Method: Übbelohde viscosimeter

GLP compliance:

no

Type of method:

other: Übbelohde viscosimeter

Specific details on test material used for the study:

Several aqueous solutions of lactic acid in varying concentrations

Key result

Temp.:

other: 25.0°C

Parameter:

other: cP

Value:

18.4

Remarks on result:

other: 80 % aqueous solution

Temp.:

other: 40.0

Parameter:

other: cP

Value:

9.4

Remarks on result:

other: 80 % aqueous solution

Temp.:

other: 60.0

Parameter:

other: cP

Value:

4.8

Remarks on result:

other: 80 % aqueous solution

Temp.:

other: 80.0

Parameter:

other: cP

Value:

2.9

Remarks on result:

other: 80 % aqueous solution

Conclusions:

The viscosity of lactic acid 80 % solution is in line with expectations and literature data.

Executive summary:

Viscosity was determined with an Übbelohde viscosimeter. An 80 % aqueous solution of lactic acid has a viscosity of 18.4 cP (= 18.4 mPa × s) at 25 °C.

Reference 3

Endpoint:

viscosity

Type of information:

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

Adequacy of study:

supporting study

Justification for type of information:

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

Reason / purpose for cross-reference:

read-across source

Temp.:

other: 25.0°C

Parameter:

dynamic viscosity (in mPa s)

Value:

36.9

Conclusions:

At 25 °C, a lactic acid aqueous solution of 88.6 % w/w has a viscosity of 36.9 centipoise. Viscosity increases with increasing concentration and decreases with increasing temperature.

Executive summary:

At 25 °C a lactic acid aqueous solution of 88.6 % w/w has a viscosity of 36.9 centipoise. Viscosity increases with increasing concentration and decreases with increasing temperature.

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

Description of key information

An 80 % aqueous solution of lactic acid has a viscosity of 18.4 cP (= 18.4 mPa × s) at 25 °C.

Key value for chemical safety assessment

Viscosity:

18.4 mPa · s (dynamic)

at the temperature of:

25 °C