Potassium iodate

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Data is from study report

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Principles of method if other than guideline:

The objective of the study was to assess the dermal toxicity of test chemical after single dose application by dermal route in rats.

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Potassium iodate

EC Number:

231-831-9

EC Name:

Potassium iodate

Cas Number:

7758-05-6

Molecular formula:

HIO3.K

IUPAC Name:

potassium iodate

Details on test material:

- Molecular formula :IKO3
- Molecular weight :214.001 g/mol
- Substance type:Inorganic
- Physical state:White Solid
- Analytical purity:99.71%
- Lot/batch No.:Lot 1/09
- Storage condition of test material:Kept in a cool, dry and well- ventilated area.
- Other:
Handling and Disposal
Safety precautions : Washed thoroughly after handling. Removed contaminated clothings and washed before reuse. Used with adequate ventilation. Minimize dust generation and accumulation. Avoided eye and skin contact. Kept container tightly closed. Avoided inhalation and spilling. Aprons, caps, mask, gloves and goggles were used to ensure the health and safety of the personnel.
Disposal : No test item was remained unused during the study.

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source:In-House Bred at Sa-Ford, Animal Facility
- Age at study initiation:N/A
- Health Status:Healthy young adult animals were used for the study. Females were nulliparous and non pregnant.
- Weight (Prior to Treatment):Male: Minimum: 227 g and Maximum: 251 g , Female: Minimum: 200 g and Maximum: 224 g
- Fasting period before study:N/A
- Housing:The animals were housed individually in polycarbonate cages.
- Bedding : All cages were provided with corn cobs.
- Room Sanitation : The experimental room floor and work tops were swept and mopped with disinfectant solution every day.
- Cages and water bottle : All the cages and water bottles were changed at least twice every week.
- Diet (e.g. ad libitum):All animals were provided conventional laboratory rodent diet (Nutrivet Life Sciences, Pune) ad libitum.
- Water (e.g. ad libitum):Aqua guard filtered tap water was provided ad libitum via drinking bottles.
- Acclimation period:All animals were acclimatized to the test conditions for 6 days prior to administration of the test item.
- Randomization : Animals were selected manually. No computer generated randomization program was used.

ENVIRONMENTAL CONDITIONS
- Temperature (°C):Minimum: 20.00 °C and Maximum: 23.60 °C
- Humidity (%):Minimum: 37.40% and Maximum: 61.80%
- Air changes (per hr):More than 12 changes per hour
- Photoperiod (hrs dark / hrs light):12:12

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

other: distilled water

Details on dermal exposure:

TEST SITE
- Area of exposure:The test item was applied uniformly over clipped dorsal area of rat skin.
- % coverage:Approximately 10% body surface area of rat.
- Type of wrap if used:The porous gauze dressing and non-irritating tape.

REMOVAL OF TEST SUBSTANCE
- Washing (if done):The residual test item was removed by using distilled water.
- Time after start of exposure:24-hour.

TEST MATERIAL
- Amount(s) applied (volume or weight with unit):A limit dose of 2000 mg/ kg body weight of test item was applied.
- Constant volume or concentration used: yes
- For solids, paste formed: yes

VEHICLE
- Amount(s) applied (volume or weight with unit):0.2 ml distilled water
- Concentration (if solution):N/A
- Lot/batch no. (if required):N/A
- Purity:N/A

Duration of exposure:

24 hrs

Doses:

2000 mg/kg body weight.

No. of animals per sex per dose:

10 (Five per sex)

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing:Daily
- Necropsy of survivors performed: yes
At the end of 14 day observation period, all the surviving rats were euthanised by overdose of CO2 and subjected to gross pathology examination, for external and internal observations.
- Other examinations performed:
- Clinical signs : After test item administration, individual animals were frequently observed at 1, 2, 3 and 4 hours post dosing on day 0 (day of dosing). Subsequently, all animals were observed once a day during the 14 day observation period.

- Body weight: All rats were weighed on days 0 (prior to dosing), 7 and 14.

other:
- Local Signs/Skin Reactions
All animals were observed once daily during days 1-14 (in common with clinical signs).

- Mortality
Animals were observed twice daily for any mortality during the experimental period.

Statistics:

No statistical analysis was performed since the study was terminated with limit test.

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: Non toxic to animals

Mortality:

No mortality was observed at limit dose of 2000 mg/kg body weight of test item during the 14 day observation period.

Clinical signs:

other: No clinical signs were observed in any of the treated rats at the dose of 2000 mg/kg body weight during the 14 day observation period.

Gross pathology:

The external and internal gross pathological observation of all terminally sacrificed animals did not show any pathological abnormality.

Any other information on results incl. tables

Table 1: Individual Animal Body Weight (g) andBody Weight Changes(%)

Dose:2000 mg/ kg bodyweight                                                                                                         

Animal No.	Sex	Body Weight (gram)			Body Weight Change (%)
		Day 0	Day 7	Day 14	Day 0-7	Day 0-14
1	Male	238	229	227	-3.78	-4.62
2		245	231	261	-5.71	6.53
3		251	244	263	-2.79	4.78
4		244	228	231	-6.56	-5.33
5		227	227	248	0.00	9.25
6	Female	208	209	223	0.48	7.21
7		224	221	234	-1.34	4.46
8		211	197	242	-6.64	14.69
9		219	216	218	-1.37	-0.46
10		200	180	199	-10.00	-0.50

Keys:* = Based on day 0 body weight taken prior to dose application.

 

Table 2: Individual Animal Clinical Signs and Symptoms

 

Dose:2000 mg/kg body weight

Animal No.	Sex	Hour(s) - Day 0				Day
		1	2	3	4	1	2	3	4	5	6	7
1	Male	1	1	1	1	1	1	1	1	1	1	1
2		1	1	1	1	1	1	1	1	1	1	1
3		1	1	1	1	1	1	1	1	1	1	1
4		1	1	1	1	1	1	1	1	1	1	1
5		1	1	1	1	1	1	1	1	1	1	1
6	Female	1	1	1	1	1	1	1	1	1	1	1
7		1	1	1	1	1	1	1	1	1	1	1
8		1	1	1	1	1	1	1	1	1	1	1
9		1	1	1	1	1	1	1	1	1	1	1
10		1	1	1	1	1	1	1	1	1	1	1

 

Animal No.	Sex	Day
		8	9	10	11	12	13	14
1	Male	1	1	1	1	1	1	1
2		1	1	1	1	1	1	1
3		1	1	1	1	1	1	1
4		1	1	1	1	1	1	1
5		1	1	1	1	1	1	1
6	Female	1	1	1	1	1	1	1
7		1	1	1	1	1	1	1
8		1	1	1	1	1	1	1
9		1	1	1	1	1	1	1
10		1	1	1	1	1	1	1

Keys: 1 = Normal

 

Table 3: Individual Animal Mortality Record

 

Dose:2000 mg/kg body weight

Animal No.	Sex	Days of Observation (0 to 14)
		Morning Observations	Evening Observations
1	Male	No mortality and morbidity	No mortality and morbidity
2		No mortality and morbidity	No mortality and morbidity
3		No mortality and morbidity	No mortality and morbidity
4		No mortality and morbidity	No mortality and morbidity
5		No mortality and morbidity	No mortality and morbidity
6	Female	No mortality and morbidity	No mortality and morbidity
7		No mortality and morbidity	No mortality and morbidity
8		No mortality and morbidity	No mortality and morbidity
9		No mortality and morbidity	No mortality and morbidity
10		No mortality and morbidity	No mortality and morbidity

 

Applicant's summary and conclusion

Interpretation of results:

other: Not classified

Conclusions:

Under the conditions of this; acute dermal toxicity study of test chemical in rats is as given below:
The acute dermal median lethal dose of test chemical was >2000 mg/kg body weight.Thus by considering the CLP criteria for acute toxicity rating for the chemicals, it infers that test chemical does not exhibit acute dermal toxicity i.e it is acutely non toxic to animals.

Executive summary:

Acute Dermal Toxicity Study of test chemical in Wistar Rats was performed as per OECD No.402.

Five male and five female healthy young adult rats were randomly selected and used for conducting acute dermal toxicity study. Rats free from injury and irritation of skin were selected for the study. Twenty four hours prior to dermal application of test item, approximately 10% of body surface area of each rat was clipped. A limit dose of 2000 mg/ kg body weight of test item moistened with 0.2 ml distilled water was applied by single dermal application and observed for 14 days after treatment.

On test day 0, anamount of pulverized test item moistened with 0.2 ml distilled water was applied directly on the intact skin of clipped area of rats; the porous gauze dressing was put on to the intact skin of clipped area.This porous gauze dressing was covered with a non-irritating tape.The dressing was wrapped around the abdomen and anchored with non-irritating adhesive tape.After the 24-hour application period, the dressings were removed and the skin was gently wiped with distilled water.The skin reactions were assessed.

The animals were observed daily for mortality and clinical signs, during the acclimatization period. All animals were observed for clinical signs at approximately 1, 2, 3 and 4 hours after treatment on day 0 and once daily during test days 1‑14. Mortality was recorded after application on test day 0 and twice daily during days 1-14 (at least once on the day of sacrifice). Local signs / Skin reactions were observed daily from test days 1-14 (in common with clinical signs). Body weights were re­corded on day 0 (prior to application) and on day 7 and 14. All animals were necropsied and examined macroscopically.

No mortality and clinical sign was observed in any animal treated at the dose of 2000mg/kg, during the 14 day observation period.

At 2000 mg/kg, decline in mean body weight of male and female on day 7, whereas gain in mean body weight was observed on day 14 as compared to day 0.

The external and internal gross pathological observation of all terminally sacrificed animals did not show any pathological abnormality.

Under the conditions of this; acute dermal toxicity study of test chemical in rats is as given below:

The acute dermal median lethal dose of test chemical was >2000 mg/kg body weight.Thus by considering the CLP criteria for acute toxicity rating for the chemicals, it infers that test chemical does not exhibit acute dermal toxicity i.e it is acutely non toxic to animals.