[[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid

pH

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

Test material information

Constituent 1

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 value

pH value 1

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

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 3

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

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

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

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

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 8

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 9

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 10

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

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.