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EC number: 407-550-4 | CAS number: 69184-17-4
Vapour pressure
Administrative data
- Endpoint:
- vapour pressure
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 30 April 1991-25 November 1991.
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP guideline study
Cross-reference
- Reason / purpose for cross-reference:
- reference to same study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 991
- Report date:
- 1991
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 104 (Vapour Pressure Curve)
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.4 (Vapour Pressure)
- Qualifier:
- according to guideline
- Guideline:
- other: EPA 63.9
- GLP compliance:
- yes
- Type of method:
- effusion method: vapour pressure balance
Test material
- Reference substance name:
- Methyl O-(4-amino-3,5-dichloro-6-fluoropyridin-2-yloxy)acetate
- EC Number:
- 407-550-4
- EC Name:
- Methyl O-(4-amino-3,5-dichloro-6-fluoropyridin-2-yloxy)acetate
- Cas Number:
- 69184-17-4
- Molecular formula:
- Hill formula: C8 H7 Cl2 F N2 O3 CAS formula: C8 H7 Cl2 F N2 O3
- IUPAC Name:
- methyl 2-[(4-amino-3,5-dichloro-6-fluoropyridin-2-yl)oxy]acetate
- Details on test material:
- - Name of test material (as cited in study report): Fluroxypyr methyl ester
- Physical state: white crystalline powder
- Analytical purity: 99.7% w/w
- Purity test date: 26.09.1990
- Lot/batch No.: AGR 279096
- Expiration date of the lot/batch: September 1992
- Storage condition of test material: below 5 °C
Constituent 1
Results and discussion
Vapour pressureopen allclose all
- Temp.:
- 20 °C
- Vapour pressure:
- 0 Pa
- Temp.:
- 25 °C
- Vapour pressure:
- 0 Pa
Any other information on results incl. tables
Prior to Run 1, the sample was pumped down overnight. Radius of sample pan hole was 1.55 mm. Results were as follows:
Temperature (K) |
Reciprocal temperature (1/K) |
Mass difference (kg) |
Vapour pressure (Pa) |
log VP |
297.75 |
3.3585E-3 |
1.500E-10 |
1.9502E-4 |
-3.7099 |
301.90 |
3.3124E-3 |
2.000E-10 |
2.6003E-4 |
-3.5850 |
306.65 |
3.2610E-3 |
2.300E-10 |
2.9903E-4 |
-3.5243 |
310.25 |
3.2232E-3 |
3.000E-10 |
3.9004E-4 |
-3.4089 |
314.75 |
3.1771E-3 |
4.000E-10 |
5.2005E-4 |
-3.2840 |
318.40 |
3.1407E-3 |
5.700E-10 |
7.4108E-4 |
-3.1301 |
322.25 |
3.1032E-3 |
8.000E-10 |
1.0401E-3 |
-2.9829 |
326.15 |
3.0661E-3 |
1.050E-9 |
1.3651E-3 |
-2.8648 |
331.25 |
3.0189E-3 |
1.600E-9 |
2.0802E-3 |
-2.6819 |
334.90 |
2.9860E-3 |
2.140E-9 |
2.7823E-3 |
-2.5556 |
338.75 |
2.9520E-3 |
2.900E-9 |
3.7704E-3 |
-2.4236 |
343.75 |
2.9091E-3 |
4.300E-9 |
5.5906E-3 |
-2.2525 |
347.05 |
2.8814E-3 |
5.120E-9 |
6.6567E-3 |
-2.1767 |
349.65 |
2.8600E-3 |
7.200E-9 |
9.3610E-3 |
-2.0287 |
353.50 |
2.8289E-3 |
1.006E-8 |
1.3079E-2 |
-1.8834 |
356.40 |
2.8058E-3 |
1.180E-8 |
1.5342E-2 |
-1.8141 |
The relationship used: log VP (Pa) = slope*(1/T(K)) + intercept
On the basis of the above data:
slope = -3546.693, standard deviation 97.973 (2.762%)
intercept = 8.067, standard deviation 0.300 (3.716%)
VP (298.15 K) = 1.483E-4 Pa (-9.517E-6/+1.017E-5)
For the Run 2, the sample was cooled to around 38 °C in 54 minutes after Run 1.The results were as follows:
Temperature (K) |
Reciprocal temperature (1/K) |
Mass difference (kg) |
Vapour pressure (Pa) |
log VP |
310.90 |
3.2165E-3 |
7.300E-10 |
9.4910E-4 |
-3.0227 |
313.90 |
3.1857E-3 |
8.600E-10 |
1.1181E-3 |
-2.9515 |
317.75 |
3.1471E-3 |
1.000E-9 |
1.3001E-3 |
-2.8860 |
321.65 |
3.1090E-3 |
1.100E-9 |
1.4301E-3 |
-2.8446 |
318.65 |
3.1382E-3 |
9.000E-10 |
1.1701E-3 |
-2.9318 |
323.40 |
3.0921E-3 |
1.250E-9 |
1.6252E-3 |
-2.7891 |
325.65 |
3.0708E-3 |
1.270E-9 |
1.6512E-3 |
-2.7822 |
328.40 |
3.0451E-3 |
1.500E-9 |
1.9502E-3 |
-2.7099 |
332.15 |
3.0107E-3 |
1.730E-9 |
2.2492E-3 |
-2.6480 |
336.05 |
2.9757E-3 |
2.220E-9 |
2.8863E-3 |
-2.5397 |
339.15 |
2.9485E-3 |
2.600E-9 |
3.3804E-3 |
-2.4710 |
342.35 |
2.9210E-3 |
3.270E-9 |
4.2514E-3 |
-2.3715 |
344.05 |
2.9066E-3 |
4.050E-9 |
5.2655E-3 |
-2.2786 |
347.75 |
2.8756E-3 |
5.100E-9 |
6.6307E-3 |
-2.1784 |
349.25 |
2.8633E-3 |
6.200E-9 |
8.0608E-3 |
-2.0936 |
353.90 |
2.8257E-3 |
8.460E-9 |
1.0999E-2 |
-1.9586 |
357.05 |
2.8007E-3 |
1.146E-8 |
1.4900E-2 |
-1.8268 |
On the basis of the above data:
slope = -2796.728, standard deviation 146.264 (5.230%)
intercept = 5.866, standard deviation 0.440 (7.507%)
VP (298.15 K) = 3.059E-4 Pa (-3.342E-5/+3.752E-5)
For the Run 3, the sample was cooled to around 32 °C in 107 minutes after Run 2.The results were as follows:
Temperature (K) |
Reciprocal temperature (1/K) |
Mass difference (kg) |
Vapour pressure (Pa) |
log VP |
305.15 |
3.2771E-3 |
4.000E-10 |
5.2005E-4 |
-3.2840 |
309.55 |
3.2305E-3 |
5.000E-10 |
6.5007E-4 |
-3.1870 |
311.05 |
3.2149E-3 |
5.500E-9 |
7.1507E-4 |
-3.1456 |
316.05 |
3.1641E-3 |
8.000E-9 |
1.0401E-3 |
-2.9829 |
319.55 |
3.1294E-3 |
1.050E-10 |
1.3651E-3 |
-2.8648 |
322.25 |
3.1032E-3 |
1.350E-9 |
1.7552E-3 |
-2.7557 |
326.75 |
3.0604E-3 |
1.800E-9 |
2.3402E-3 |
-2.6307 |
331.05 |
3.0207E-3 |
1.630E-9 |
2.1192E-3 |
-2.6738 |
335.95 |
2.9766E-3 |
1.720E-9 |
2.2362E-3 |
-2.6505 |
340.65 |
2.9356E-3 |
2.450E-9 |
3.1853E-3 |
-2.4968 |
343.65 |
2.9099E-3 |
3.100E-9 |
4.0304E-3 |
-2.3946 |
348.55 |
2.8690E-3 |
4.200E-9 |
5.4606E-3 |
-2.2628 |
350.25 |
2.8551E-3 |
5.000E-9 |
6.5007E-3 |
-2.1870 |
354.15 |
2.3237E-3 |
7.000E-9 |
9.1009E-3 |
-2.0409 |
357.50 |
2.7972E-3 |
1.036E-8 |
1.3469E-2 |
-1.8707 |
361.50 |
2.7663E-3 |
1.630E-8 |
2.1192E-2 |
-1.6738 |
On the basis of the above data:
slope = -2805.692, standard deviation 159.747 (5.694%)
intercept = 5.872, standard deviation 0.481 (8.196%)
VP (298.15 K) = 2.893E-4 Pa (-3.414E-5/+3.871E-5)
The mean value of VPs determined after 3 Runs, VP(298.15 K) = 2.478E-4 Pa is accepted as the value for regulatory purposes.
Analogically, the value of VP at 293.15 K (1.683E-4 Pa) was calculated.
Applicant's summary and conclusion
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