Registration Dossier

Diss Factsheets

Physical & Chemical properties

Surface tension

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
14-Oct-2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: This study has been performed according to OECD and EU guidelines and according to GLP principles.
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Surface tension:
51.1 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: mean of three determinations

Results

The determinations were performed at 20.0 ±and at this temperature, the tabulate value for water is 72.75 mN/m.

 

After zero point adjustment, the surface tension of the distilled water (sg) was determined to be 72.42 mN/m; therefore the calibration factor was calculated to be f (water) = 1.0045.

 

The test item was tested at aqueous dilutions of 1 g/L, in accordance with OJEC indications.

The aqueous solution was maintained at 20.0 ±in a thermostatic oven and then tested.

 

Six measurements were performed at; data are reported in Table 1 and results in Tables 2 and 3.

 

TABLE 1 Algea Fert Solid K +: surface tension values at.

                  Measurement values

 

Measurements

Test item

dilution 1 g/L

(mN/m)

Measurements

Test item

dilution 1 g/L

(mN/m)

1st  measure

52.0

4th  measure

52.3

2nd  measure

52.2

5th  measure

52.1

3rd  measure

52.0

6th  measure

52.0

Mean (a)

52.1

S.D.

0.12

RSD%

0.22%

 


 

TABLE 3 Algea Fert Solid K +: surface tension at.

                  Correction with water calibration

 

Measurements

Test item

dilution 1 g/L

(mN/m)

Mean (a)

(mN/m)

52.1

Water calibration

factor

1.0045

Corrected values (b)

(mN/m)

52.3

  

 

TABLE 4 Algea Fert Solid K +: surface tension at.

                  Correction Table and interpolation method

 

Sample solution

(mg/L)

Corrected

values (b)

(mN/m)

Tab.

X1

(mN/m)

Tab.

X2

(mN/m)

Tab.

Y1

(mN/m)

Tab.

Y2

(mN/m)

Slope

(m)

Interc.

(q)

St

(mN/m)

Test item

Dilution

1 g/L

(mN/m)

52.3

50.7

52.8

52.0

54.0

0.9524

3.7143

51.1

Conclusions:
From the experimental data obtained according to the guideline A.5 in Official Journal L 383 Part A, it can be concluded that the surface tension at 20°C of the 1 g/L Test item aqueous solutions was 51.1 mN/m.

According to the interpretation of the results suggested in the A.5 official method, the Algea Fert Solid K +formulation sample should be regarded as a surface-active material.

Description of key information

Key value for chemical safety assessment

Surface tension:
51.1
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information