Reaction mass of diisobutyl hydrogen phosphate and isobutyl dihydrogen phosphate

Endpoint summary

Description of key information

- Acute oral toxicity in rats (OECD 420 guideline study, Kr. 2): LD50 is higher than 2000 mg/kg bw.
- Acute dermal toxicity: a waiving based on the corrosivity of the submitted substance (category 1B, H314) was proposed
- Acute inhalation toxicity: a waiving based on the corrosivity of the submitted substance (category 1B, H314) was proposed

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 17th January to 14th February 2007

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Guideline study in compliance wih the GLP but no certificate of analysis was available.

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

OECD Guideline 420 (Acute Oral Toxicity - Fixed Dose Method)

Deviations:

no

Principles of method if other than guideline:

not applicable

GLP compliance:

yes

Test type:

fixed dose procedure

Limit test:

yes

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Deuchland GmbH, D97633 Sulzfeld, Germany
- Age at study initiation: no data
- Weight at study initiation: 172 g - 181 g
- Fasting period before study: overnight
- Housing: 2 or 3 per cage
- Bedding: pinewood sawdust "lignocel Faserm" from Altromin, D-32791 Lage, Lippe
- Diet: "Altromin 1314" from Altromin GmbH, D-32791 Lage, Lippe ad libitum
- Water: Domestic water acidified with hydrochloroc acid to pH 2.5 ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 +/- 3 °C
- Humidity (%): at least 30% preferably not exceed 70%
- Air changes (per hr): 10 times
- Photoperiod (hrs dark / hrs light): 12 hrs dark/12 hrs light

IN-LIFE DATES: From: January 17, 2007 To: February 14, 2007

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

VEHICLE
- Amount of vehicle (if gavage): 10 mL/kg
- Justification for choice of vehicle: no data


MAXIMUM DOSE VOLUME APPLIED: 2000 mg/kg


CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: Based on the result of the sighting study, in which one female rat was given the test substance in a 2000 mg/kg bw.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

4 females

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: each rat was observed 30 min, 2, 4 and 6 hours after administration and thereafter daily. Body weight was recorded on days 0, 7 and 14.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight and gross necrospsy examination.

Statistics:

Not required

Preliminary study:

The animal included in the sighting study survived the treatment and showed clinical signs of toxicity. These consisted of dyspnoea and piloerection 30 minutes and 2 hours after the administration of the test item. After 4 and 6 hours piloerection was still observed. From day 1 to the end on the observation period on day 14 no abnormalities were revealed.
Body weight gain was normal during the study period (see Table 1).
The post mortem inspection revealed no pathological abnormalities.

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality during the main study

Clinical signs:

other: Most of the animals showed signs of toxicity ranging from slight to severe. Animals N°2, N°4 and N°5 showed dyspnea and piloerection 30 minutes and 2 hours after the application of the test item, whereas hunched posture and piloerection were observed at a

Gross pathology:

The gross necropsy of the animals revealed no pathological abnormalities

Other findings:

no other findings

Table 1 : Body Weight

Sighting study

Individual values (g)  

Animal N°	Dose mg/kg BW	Sex	Day 0	Day 7	Day 14
1	2000	Female	152	186	205

  

Main study

 Mean values (g)

Dose mg/kg BW	Sex	Day 0			Day 7			Day 14
		Mean	SD	n	Mean	SD	n	Mean	SD	n
2000	Female	175	4	4	195	5	4	220	2	4

SD: Standard deviation

N: Number of animals

 Individual values (g)

Animal N°	Dose mg/kg BW	Sex	Day 0	Day 7	Day 14
2	2000	Female	172	198	218
3	2000	Female	174	191	223
4	2000	Female	181	200	220
5	2000	Female	172	189	218

  

Interpretation of results:

GHS criteria not met

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

Under the test conditions of this study, the acute median lethal dose (LD50) of the Reaction mass of "Diisobutyl hydrogen phosphate and Isobutyl dihydrogen phosphate" was higher than 2000 mg/kg bw. Based on this result, no classification is required according to EU criteria.

Executive summary:

The acute oral toxicity of the Reaction mass of "Diisobutyl hydrogen phosphate and Isobutyl dihydrogen phosphate" was assessed in a study according to the Fixed Dose Procedure (OECD Guideline 420; EC test method B1.bis) and in accordance with GLP. Following a range-finding study in one female Wistar rat at 2000 mg/kg bw, four further fasted female rats were given a single oral dose of test material, as a suspension in water at the same dose level. The animals were observed for fourteen days after the day of dosing and were then killed for gross pathological examination.

There were no deaths during the study. On the day of dosing, all animals showed piloerection with dyspnea and/or hunched posture. Piloerection persisted to the following day in one animal only. All animals showed normal behaviour from day 2 of observation. All animals showed expected gain in bodyweight during the study. No abnormalities were noted at necropsy.

Under these experimental conditions, the LD50 was determined to be higher than 2000 mg/kg bw for the acute oral toxicity of the Reaction mass of "Diisobutyl hydrogen phosphate and Isobutyl dihydrogen phosphate". Therefore no classification is required according to the Regulation (EC) 1272/2008 (CLP) and the Directive 67/548/EEC criteria.

 

This acute oral study is classified as acceptable. It satisfies the guideline requirement for an acute oral study in the rats.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Quality of whole database:

Key study performed according to the OECD 420 guideline study and in compliance with the GLP (Klimisch score = 2).

Acute toxicity: via inhalation route

Link to relevant study records

Reference

Endpoint:

acute toxicity: inhalation

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is classified as corrosive to the skin

Endpoint conclusion

Endpoint conclusion:

no study available

Quality of whole database:

waiving based on the corrosive properties of the submitted substance (category 1B; H314).

Acute toxicity: via dermal route

Link to relevant study records

Reference

Endpoint:

acute toxicity: dermal

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is classified as corrosive to the skin

Endpoint conclusion

Endpoint conclusion:

no study available

Quality of whole database:

waiving based on the corrosive properties of the submitted substance (category 1B; H314) .

Additional information

1 - Acute oral toxicity:

One study was available with reliability 2 according to Klimisch rating.

The acute oral toxicity of the Reaction mass of "Diisobutyl hydrogen phosphate and Isobutyl dihydrogen phosphate" was assessed in a study according to the Fixed Dose Procedure (OECD Guideline 420; EC test method B1.bis) and in accordance with GLP. Following a range-finding study in one female Wistar rat at 2000 mg/kg bw, four further fasted female rats were given a single oral dose of test material, as a suspension in water at the same dose level. The animals were observed for fourteen days after the day of dosing and were then killed for gross pathological examination.

There were no deaths during the study. On the day of dosing, all animals showed piloerection with dyspnea and/or hunched posture. Piloerection persisted to the following day in one animal only. All animals showed normal behaviour from day 2 of observation. All animals showed expected gain in bodyweight during the study. No abnormalities were noted at necropsy.

Under these experimental conditions, the LD50 was determined to be higher than 2000 mg/kg bw for the acute oral toxicity of the Reaction mass of "Diisobutyl hydrogen phosphate and Isobutyl dihydrogen phosphate".

2 - Acute inhalation toxicity:

The Reaction Mass of "Diisobutyl hydrogen phosphate and Isobutyl dihydrogen phosphate” is self-classified as corrosive category 1B, H314 according to the criteria of the Regulation (EC) 1272/2008 (CLP) and as corrosive to the skin (C, R34) according to the criteria of the Directive 67/548/EEC. Therefore, according to the column 2 of the Annex VIII of the Regulation (EC) NO. 1907/2006 (REACh) (section 8.5), an acute inhalation toxicity study does not need to be conducted if the substance is classified as corrosive to the skin.

3 - Acute dermal toxicity:

In accordance with column 2 of REACh Annex VIII, the dermal acute study (required in section 8.5.3) does not need to be conducted as the substance is a strong acid (pH < 2) and classified as corrosive, therefore a waiving was proposed.

Justification for selection of acute toxicity – oral endpoint
Only one acute study was available

Justification for classification or non-classification

1- Acute oral toxicity:

As the oral LD50 (rats) is higher than 2000 mg/kg bw, the Reaction mass of "Diisobutyl hydrogen phosphate and Isobutyl dihydrogen phosphate" is not classified for acute oral toxicity according to the Regulation (EC) 1272/2008 (CLP) and to the Directive 67/548/EEC criteria.

2- Acute inhalation toxicity:

No data is available for this exposure route. However, as the substance is classified as corrosive, no further test has to be conducted. Therefore, no classification is possible due to lack of data.

3 -Acute dermal toxicity:

No data is available for this exposure route. However, as the substance is classified as corrosive, no further test has to be conducted. Therefore, no classification is possible due to lack of data.