1,1,3-trimethylindan-4-amine

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

12 Mar - 19 Jun 2020

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2020

Report date:

2020

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Hess. Ministerium für Umwelt, Klimaschutz, Landwirtschaft und Verbraucherschutz, Wiesbaden, Germany

Type of method:

OECD harmonised ring method

Test material

Test material information

Constituent 1

Reference substance name:

1,1,3-trimethyl-2,3-dihydro-1H-inden-4-amine

EC Number:

838-724-1

Cas Number:

94568-76-0

Molecular formula:

C12H17N

IUPAC Name:

1,1,3-trimethyl-2,3-dihydro-1H-inden-4-amine

Results and discussion

Surface tension

Surface tension:

43.1 mN/m

Temp.:

20 °C

Conc.:

372 mg/L

Remarks on result:

other: concentration is ca. 90% of saturation concentration. The concentrations of the two solutions were determined by HPLC analyses (results: 379 mg/L for Test solution 1 and 364 mg/L for Test solution 2).

Any other information on results incl. tables

Individual Results of the Determination of the Concentration by HPLC
The HPLC data of the two solutions (Test solution 1 and Test solution 2) of the test
item (HPLC dilution factor 20) are given in the Table below.

Table HPLC data: determination of the test item concentration

Name	Amount Reference mg/L	Area mAU*min	Dilution Factor	Slope (C1)	Slope Used (C1)	Content mg/L	Mean mg/L
Reference-3 Dil.1	18.072	6.14456247		0.34000456
Reference-3 Dil.1	18.072	6.16445970		0.34110556	0.34055506
Testsolution 1 Dil 1		6.46010755	20		0.34055506	379.3870
Testsolution 1 Dil 1		6.44641385	20		0.34055506	378.5828	378.9849
Testsolution 2 Dil 1		6.19933949	20		0.34055506	364.0727
Testsolution 2 Dil 1		6.20230734	20		0.34055506	364.2470	364.1598
ACN/Water		not detected	1
ACN/Water		not detected	1

Results (rounded): 379 mg/L (Test solution 1)

364 mg/L (Test solution 2)

 

Slope = Peak Area (Reference)/ Amount Reference (mg/L)

Content (mg/L) = (Peak Area (Sample) x Dil. factor)/ Slope (Mean Group)

Slope (Mean Group) = Mean value of slope factors (Group)

Individual Results of the Measurement of the Surface Tension
The surface tension values of the two aqueous solutions of the test item were determined.  The measurement was carried out at 20 °C ± 0.5 °C.
A correction factor (Harkins & Jordan) is included. 
The age of the test solutions at the beginning of the measurement was 50.0 hours for the Test solution 1 and 50.5 hours for the Test solution 2. The age of the test solution is defined as the period of time from the preparation of the solution to the recording of the surface tension value. The measured data are given in Table below.

Table 4 Surface tension of test item, technical substance,
measured data

	Experiment 1		Experiment 2
	Time [s]	σM [mN/m]	Time [s]	σM [mN/m]
1. measurement	68.6	42.47	69.7	42.73
2. measurement	109.6	42.51	113.2	42.75
3. measurement	153.1	42.49	157.0	42.78
4. measurement	196.8	42.54	197.3	42.89
5. measurement	238.3	42.50	241.7	42.81
6. measurement	278.6	42.54	283.5	42.79
7. measurement	323.5	42.51	325.6	42.81
8. measurement	366.8	42.51	370.7	42.79
9. measurement	411.7	42.51	414.2	42.81
10. measurement	453.0	42.52	457.3	42.82
Mean σM [mN/m]		42.51		42.80

Mean (experiments 1 and 2): σmean = 42.66 mN/m

Standard deviation: 0.2 mN/m

Relative standard deviation: 0.5 %

The mean value, multiplied by the calibration factor (F=1.0115) results in:
σ = σmean · F = 43.1 mN/m

Final Result
The surface tension of two aqueous solutions of test item, technical substance, was determined using the OECD harmonized ring method according to the OECD Guideline 115 and European Commission Council Regulation (EC) No 440/2008, Annex, Part A, method A.5. The solubility of the test item in water is below 1 g/L (400 mg/L in distilled water at 20 °C, flask method).
According to the OECD Guideline and the EC Regulation saturated solutions were prepared and then diluted to 90 % of the saturation concentration. The concentrations of the two solutions were determined by HPLC analyses (results: 379 mg/L for Test solution 1 and 364 mg/L for Test solution 2).
The surface tension of the aqueous solution of test item, technical substance,
was: σ  = 43.1 mN/m at 20 °C