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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
pH
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study meets generally accepted scientific principles, acceptable for assessment as supporting data

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report date:
2018

Materials and methods

Principles of method if other than guideline:
pH-measurements taken in the laboratory for solutions of 96% pure, DTPTMP with increasing stoichometric amounts of the corresponding base (NaOH).
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid
EC Number:
239-931-4
EC Name:
[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid
Cas Number:
15827-60-8
Molecular formula:
C9H28N3O15P5
IUPAC Name:
[(bis{2-[bis(phosphonomethyl)amino]ethyl}amino)methyl]phosphonic acid
Test material form:
solid

Results and discussion

pH valueopen allclose all
pH value:
2.3
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP
pH value:
2.5
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-1Na
pH value:
2.8
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-2Na
pH value:
4
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-3Na
pH value:
5.6
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-4Na
pH value:
6.7
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-5Na
pH value:
7.7
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-6Na
pH value:
9
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-7Na
pH value:
10.5
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-8Na
pH value:
11.2
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-9Na
pH value:
11.4
Temp.:
20 °C
Concentration:
2 other: mmol/l
Remarks on result:
other: Stoichiometric loading of base equivalent to DTPMP-10Na

Any other information on results incl. tables

Table 1: Titration in water

Determination 1

Sample mass (mg) 171.9

Equivalent NaOH

0

1

2

3

4

5

6

7

8

9

10

1N NaOH (ml)

0.000

0.287

0.574

0.861

1.147

1.434

1.721

2.008

23.295

2.582

2.869

pH

2.29

2.49

2.83

4.04

5.59

6.69

7.72

9.06

10.51

11.18

11.42

 

Determination 2

Sample mass (mg) 170.9

 

Equivalent NaOH

0

1

2

3

4

5

6

7

8

9

10

1N NaOH (ml)

0.000

0.285

0.570

0.856

1.141

1.426

1.711

1.996

2.282

2.567

2.852

pH

2.28

2.48

2.82

4.02

5.57

6.67

7.74

9.03

10.47

11.15

11.38

 

 

Applicant's summary and conclusion

Conclusions:
The pH of the substance has been determined using an acceptable scientific method. The result is considered reliable.