Diammonium hydrogenorthophosphate

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

October 6 – 26, 2000

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Well documented, GLP-compliant, according to OECD 425 in rat. Purity test substance unknown.

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

2000

Report date:

2000

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 425 (Acute Oral Toxicity: Up-and-Down Procedure)

Deviations:

no

GLP compliance:

yes

Test type:

up-and-down procedure

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

diammonium phosphate (DAP)

IUPAC Name:

diammonium phosphate (DAP)

Test material form:

other: crystals or crystalline powder

Details on test material:

- Name of test material (as cited in study report): Diammonium phosphate (DAP)
- Stability under test conditions: expected to be stable under test conditions and duration of study
- Storage condition of test material: at room temperature

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Received from Ace Animals, Inc., Boyertown, PA on September 19 and 26, 2000
- Age at study initiation: Young adult (9-11 weeks)
- Weight at study initiation: males 275 – 310 grams and females 195-230 grams
- Housing: The animals were singly housed in suspended stainless steel caging with mesh floors which conform to the size recommendations in
the most recent Guide for the Care and Use of Laboratory Animals DHEW (NIH). Litter paper was placed beneath the cage and was changed at least
three times per week.
- Diet (e.g. ad libitum): Purina Rodent Chow #5012
- Water (e.g. ad libitum): Filtered tap water was supplied ad libitum by an automatic water dispensing system.
- Acclimation period: 13 or 20 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): Temperature Range: 18-22ºC
- Photoperiod (hrs dark / hrs light): 12 hour light/dark cycle

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

An initial dose of 2000 mg of the test substance per kilogram of bodyweight was administered to one healthy female rat by oral gavage. Due to the
absence of mortality in this animal a second female received the same dose level. Following the completion of dosing and 100% survival in a total of
three females, a group of three males was tested (simultaneously) at the above dose level. Prior to use, the test substance was ground in a coffee mill and administered by gavage as a 70% w/w suspension in distilled water (preliminary solubility testing indicated that suspension in excess of 70% were too viscous to be administered properly).

Doses:

1 x 2000 mg/kg

No. of animals per sex per dose:

3

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: prior to administration and again on Days 7 and 14 (termination) after dosing
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights, histopathology

Statistics:

No data

Results and discussion

Preliminary study:

no data

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Mortality:

All animals survived

Clinical signs:

other: Animals appeared active and healthy throughout the study period

Gross pathology:

FEMALES: All tissues/organs No gross abnormalities
MALES: All tissues/organs No gross abnormalities

Other findings:

No data

Any other information on results incl. tables

none

Applicant's summary and conclusion

Interpretation of results:

practically nontoxic

Remarks:

Migrated information Criteria used for interpretation of results: not specified

Conclusions:

No signs of toxicity were observed. LD50 > 2000 mg/kg.