Sodium salts of [[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid (1-3 Na:1)

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

03.08.1982 to 17.08.1982

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1982

Report date:

1982

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Sodium salts of [[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid (5-7 Na:1)

EC Number:

701-216-4

Molecular formula:

DTPMP-5Na C9H23N3Na5O15P5 DTPMP-6Na C9H22N3Na6O15P5 DTPMP-7Na C9H21N3Na7O15P5

IUPAC Name:

Sodium salts of [[(phosphonomethyl)imino]bis[ethane-2,1-diylnitrilobis(methylene)]]tetrakisphosphonic acid (5-7 Na:1)

Test material form:

solid - liquid: aqueous solution

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: A. Tuck and Sons Limited, Battlesbridge, Essex, UK.
- Age at study initiation: 6 to 8 weeks
- Weight at study initiation: Males: 221-235 g; Females: 202-234 g.
- Fasting period before study: No
- Housing: Individually (during exposure) or in groups of five in polypropylene cages.
- Diet (e.g. ad libitum): Standard laboratory rodent diet (Rat diet provided by University of Nottingham), ad libitum
- Water (e.g. ad libitum): Mains tap water, ad libitum
- Acclimation period: Minimum of five days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22± 3
- Humidity (%): 65-75
- Air changes (per hr): Approximately 15
- Photoperiod (hrs dark / hrs light): 12/12


IN-LIFE DATES: From: 03.08.1982 to 17.08.1982

Administration / exposure

Type of coverage:

occlusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: Dorsal, lateral and ventral regions.
- % coverage: No data
- Type of wrap if used: Elastic adhesive bandage backed with aluminium foil.


REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes
- Time after start of exposure: 24 hours


TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 10 ml/kg bw

Duration of exposure:

24 hours

Doses:

10 ml/kg bw

No. of animals per sex per dose:

Five

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Skin responses were evaluated 0.5, 1, 2, 3, 4, and 5 hours after removal of the patch and residual test substance, and each day for 14 days.  Body weight was measured on days 0, 7, and 14
- Necropsy of survivors performed: yes
- Other examinations performed: Macroscopic examination.

Statistics:

Not required as no deaths occurred.

Results and discussion

Effect levels

Effect levels 1

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

>= 10 mL/kg bw

Based on:

test mat.

Effect levels 2

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

>= 5 838 mg/kg bw

Based on:

act. ingr.

Remarks:

active salt

Remarks on result:

other: equivalent to 4612 mg active acid/kg bw

Mortality:

No deaths.

Clinical signs:

lethargy (hypoactivity)

Body weight:

other body weight observations

Remarks:

Body weight gains appeared to be within normal limits throughout the two week observation period.

Gross pathology:

No abnormal findings.

Other findings:

None

Any other information on results incl. tables

Calculation of equivalent dose: Based on 

1) average specific gravity of DTPMP (5-7Na) = 1.39 (email, I. Bartlett to R. Wildey, 09.04.2003), 

2) DTPMP(5-7Na) composed of 42% active salt including minor components, remainder presumed to be water (derived from online data sheet).

An error in the study report: the clinical observations section reports that lethargy was observed in one male animal only.  Appendix I (Individual clinical observations) shows that this symptom was also observed in one female animal.

For purposes of comparison with other Group 3 results, ≥5838 mg active salt/kg bw is equivalent to ≥4612 mg active acid (DTPMP, CAS 15827-60-8)/kg bw.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

In an acute dermal toxicity study, conducted according to a protocol comparable to OECD Test Guideline 402 and according to GLP, the LD50 for DTPMP (5-7Na) was ≥10 ml/kg bw (equivalent to 5838 mg active salt/kg bw and 4612 mg active acid/kg bw based on an aqueous solution containing 33% active acid) in rats.