6,6',6''-(1,3,5-triazine-2,4,6-triyltriimino)trihexanoic acid

Hydrolysis

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

hydrolysis

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 111 (Hydrolysis as a Function of pH)

GLP compliance:

no

Analytical monitoring:

yes

Buffers:

pH 4: (Citrate buffer acc. to Sörensen):
- Composition of buffer: Citric Acid, NaOH, HCl, destilled water

pH 7: (Phosphate buffer acc. to Sörensen):
- Composition of buffer: K2PO4-Solution, Na2HPO4-Solution

pH 9: (Borate buffer acc. to Sörensen):
- 85 mL of Borax solution (1.91 g Borax ad 100 mL Water) plus 0.1 N HCl and 1 N NaOH to adjust pH to 9.006

Details on test conditions:

- 1 g test item plus 10 mL solution of pH 4, 7, 9 respectively.
- pH measurement at t=0 and t=5d.
- stirring for 5 d at 50 °C.

pH 9 solution: the pH was too low after test item addition. Therefore, the amount of test item was lowered: 0.1 g plus 15 mL pH 9 buffer solution.

Duration:

5 d

Temp.:

50 °C

Number of replicates:

1

Positive controls:

no

Negative controls:

no

Transformation products:

no

Key result

Remarks on result:

hydrolytically stable based on preliminary test

Details on results:

pH 4: pH value at t0 = 4 - 4.5; at t5d = 3.964
- residue after filtration: no degradation detectable
- filtrate: no TC detectable, total amount of all detected peaks in the filtrate = 0.15 % of original test substance concentration in the buffer solution pH 4

pH 7: pH value at t0 = 7; at t5d = 6.677
- residue after filtration: no degradation detectable
- filtrate: about 0.5 % TC of the total quantity of original test substance found, total amount of all peaks except that of TC = 0.2 % of original test substance concentration in the buffer solution pH 7.

pH 9: pH value at t0 = 8.5; at t5d = 8.303
- residue after filtration: no degradation detectable
- filtrate: about 11 % TC of the total quantity of original test substance found, total amount of all peaks except that of TC = 0.6 % of original test substance concentration in the buffer solution pH 9.

see details on results above.

Validity criteria fulfilled:

yes

Executive summary:

TC (6, 6´, 6´´- (1,3,5-triazine-2,4,6-triyltriimino) trihexanoic acid) was stable against hydrolysis at pH 4, pH 7 and pH 9 (5d at 50 °C) in a test according to OECD 111.

Reference 2

Endpoint:

hydrolysis

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1995-02-09 to 1995-05-07

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP study

Qualifier:

according to guideline

Guideline:

EU Method C.7 (Degradation: Abiotic Degradation: Hydrolysis as a Function of pH)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Buffers:

- pH 4: standard acetate buffer pH 4.65 (0.1 mol/l acetic acid -f 0.1 mol/l sodium acetate) -H 15 ml glacial acetic acid per liter.
- pH 7: standard phosphate buffer ( 0.041 mol/l di-sodiumhydrogenphosphate -i- 0.028 mol/l potassium-dihydrogenphosphate).
- pH 9: standard borate buffer (0.043 mol/l di-sodium-tetraborate + 0.017 mol/l potassium-dihydrogenphosphate).
The solubility depends on pH value. The solubility of the test substance in the buffer solution pH 4 at 20°C is < 0.002 g/l. This value is close to the detection limit (0.001 g/l) of our anaytical method. Therefore, hydrolysis test at pH 4 was not performed.

Duration:

5 d

pH:

7

Temp.:

50

Initial conc. measured:

0.302 g/L

Duration:

2.4 h

pH:

7

Temp.:

50

Initial conc. measured:

0.302 g/L

Duration:

5 d

pH:

9

Temp.:

50

Initial conc. measured:

0.304 g/L

Duration:

2.4 h

pH:

9

Temp.:

50

Initial conc. measured:

0.304 g/L

Number of replicates:

two replicates for each pH value

Positive controls:

no

Negative controls:

no

Preliminary study:

The test substance is stable at pH 7 and 9 (less than 10 % decomposition after 5 days at 50 °C).
The hydrolysis test could not be performed at pH 4 because the solubility of the test substance in the buffer solution at pH 4 is too low.

Transformation products:

no

% Recovery:

98.9

pH:

7

Temp.:

50 °C

Duration:

5 d

% Recovery:

99.2

pH:

7

Temp.:

50 °C

Duration:

2.4 h

% Recovery:

99.5

pH:

9

Temp.:

50 °C

Duration:

5 d

% Recovery:

99

pH:

9

Temp.:

50 °C

Duration:

2.4 h

Key result

Remarks on result:

hydrolytically stable based on preliminary test

Description of key information

TC (6, 6´, 6´´- (1,3,5-triazine-2,4,6-triyltriimino) trihexanoic acid) was stable at pH 7 and pH 9 (5d at 50 °C) in a preliminary test according to OECD 111.

Due to the poor solubility hydrolysis could not be determined at pH 4.