Potassium hydrogen phthalate

Short-term toxicity to fish

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to fish

Type of information:

experimental study

Adequacy of study:

key study

Study period:

16.08.2017 TO 20.08.2017

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Experimental test result performed according to the guideline.

Qualifier:

according to guideline

Guideline:

OECD Guideline 203 (Fish, Acute Toxicity Test)

Principles of method if other than guideline:

Study was conducted to access the effect of test chemical Hydrogen potassium phthalate on the growth of fish Danio rerio. Test conducted according to OECD Guideline 203 (Fish, Acute Toxicity Test).

GLP compliance:

not specified

Specific details on test material used for the study:

- Name of test material (as cited in study report): Hydrogen potassium phthalate
- Molecular formula : C8H5O4K
- Molecular weight : 204.221 g/mol
- Smiles notation : c1(c(cccc1)C(=O)[O-])C(O)=O.[K+]
- InChl : 1S/C8H6O4.K/c9-7(10)5-3-1-2-4-6(5)8(11)12;/h1-4H,(H,9,10)(H,11,12);/q;+1/p-1
- Substance type:Organic
- Physical state:Solid

Analytical monitoring:

not required

Vehicle:

not specified

Details on test solutions:

The test substance was soluble in water. Therefore, the stock solution was prepared by dissolving 400 mg of the test substance in 4 liters of potable water (passed through reverse osmosis system) with continuous one hour stirring for achieving test concentrations of 100mg/L,respectively. Potable water (passed through reverse osmosis system) was used.

Test organisms (species):

Danio rerio (previous name: Brachydanio rerio)

Details on test organisms:

TEST ORGANISM
- Common name:Zebra Fish
- Strain:Danio rerio
- Source: Unique Aqua Fish Corner
- Length at study initiation (length definition, mean, range and SD): average 1.8 cm
- Weight at study initiation (mean and range, SD): average 0.662 g
-Housing:The fishes were kept in a static tank in tap water passed through reverse osmosis system, under natural conditions along with proper feed and aeration.
-Duration of housing: 15 days
-Photoperiod: 16 hours light and 8 hours dark
-Diet : Standard brand feed, once daily
-Acclimatization: seven days
-feeding frequency: Once in a day

Test type:

static

Water media type:

freshwater

Total exposure duration:

96 h

Hardness:

150.5 mg of CaCO3

Test temperature:

23 °C

pH:

7.7 to 8.2

Dissolved oxygen:

7.8 mg/l

Nominal and measured concentrations:

100 mg/l

Details on test conditions:

TEST SYSTEM
- Test vessel: Plastic aquaria
- Material, size, headspace, fill volume: 5 liters of plastic aquaria filled with 2 liter of water
- Aeration: Aeration in test vessels was provided 1 day before the start of experiment
- No. of organisms per vessel: 8 fishes

OTHER TEST CONDITIONS
- Photoperiod: 16 hours light and 8 hours dark

Reference substance (positive control):

not specified

Key result

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

> 100 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: Other details not available

Duration:

96 h

Dose descriptor:

LC0

Effect conc.:

100 mg/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: No effects were observed

Sublethal observations / clinical signs:

(In each test, result varies always check)

8.1. Mortality and symptoms:

Nominal Concentration (mg/l)	Number of fish		Mortality (cumulated) after
			3h		6h		24h		48h		72h		96h
			V1	V2	V1	V2	V1	V2	V1	V2	V1	V2	V1	V2
Control	4	4	-	-	-	-	-	-	-	-	-	-	-	-
100	4	4	-	-	-	-	-	-	-	-	-	-	-	-

Visible Symptoms:

Nominal Concentration (mg/l)

Number of fish

symptom (cumulated) after

3h

6h

24h

48h

72h

96h

V1

V2

V1

V2

V1

V2

V1

V2

V1

V2

V1

V2

Control

4

4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

100

4

4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

NS4

Explanation of symptoms:

A: apathy

N: Narcotic-like state

C: Swimming near water surface

M: Slow movements compared to control

NS: No abnormal symptoms

S: Surfacing behaviour

L: Loss of equilibrium

SM: Shimming movement

H1: Hyperactivity

H2: Hypo activity

B: Bending behavior

F: Fin rot

IS: Invert Swimming

SB: Swimming behaviour

RF: Respiratory Function

P: Pigmentation

pH and oxygen content:

		Number of	pH readings after
Nominal	fish		24h		48h		72h		96h
Concentration			V1	V2	V1	V2	V1	V2	V1	V2
(mg/l)
Control	4	4	8.0	8.0	8.1	8.1	8.2	8.2	8.3	8.3
100	4	4	7.7	7.7	7.9	7.9	8.1	8.1	8.2	8.2

Nominal	Number of		Oxygen content (mg/L) after
Concentrationfish			24h		48h		72h		96h
(mg/l)			V1	V2	V1	V2	V1	V2	V1	V2
Control	4	4	6.9	6.9	6.8	6.8	6.7	6.7	6.5	6.5
100	4	4	6.9	6.9	6.8	6.8	6.6	6.6	6.4	6.4
8.3. Test temperature
Nominal	Number of		Temperature (°C) after
Concentrationfish			24h		48h		72h		96h
(mg/l)			V1	V2	V1	V2	V1	V2	V1	V2
Control	4	4	22.9	22.9	23	23	22.9	22.9	23	23
100	4	4	22.7 22.7		23.1	23.1	23.1	23.1	23	23

Validity criteria fulfilled:

yes

Conclusions:

Based on nominal concentrations, experimental median lethal Concentrations [LC-50 (96 h)] for test substance Hydrogen potassium phthalate on Zebra Fish Danio rerio was determine to be > 100 mg/l.

Executive summary:

Study was conducted to access the effect of test chemical Hydrogen potassium phthalate on the growth of fish Danio rerio. Test conducted according to OECD Guideline 203 (Fish, Acute Toxicity Test). The test substance was soluble in water. Therefore, the stock solution was prepared by dissolving 400 mg of the test substance in 4 liters of potable water (passed through reverse osmosis system) with continuous one hour stirring for achieving test concentrations of 100mg/L,respectively. Potable water (passed through reverse osmosis system) was used and Zebra Fish Danio rerio were exposed to these concentration for 96 hours. Bowl aquaria containing 2 liters of potable water (passed through reverse osmosis system) were loaded with 8 fishes. A static procedure was used for the study and it was conducted in compliance with the OECD guideline 203. After 96 hours of exposure to test item Hydrogen potassium phthalate to various nominal test concentrations, LC50 was determine to be > 100 mg/l . Based on the LC50, it can be consider that the chemical was nontoxic and can be consider to be not classified as per the CLP classification criteria.

Description of key information

Study was conducted to access the effect of test chemical Hydrogen potassium phthalate on the growth of fish Danio rerio. Test conducted according to OECD Guideline 203 (Fish, Acute Toxicity Test). The test substance was soluble in water. Therefore, the stock solution was prepared by dissolving 400 mg of the test substance in 4 liters of potable water (passed through reverse osmosis system) with continuous one hour stirring for achieving test concentrations of 100mg/L, respectively. Potable water (passed through reverse osmosis system) was used and Zebra Fish Danio rerio were exposed to these concentration for 96 hours. Bowl aquaria containing 2 liters of potable water (passed through reverse osmosis system) were loaded with 8 fishes. A static procedure was used for the study and it was conducted in compliance with the OECD guideline 203. After 96 hours of exposure to test item Hydrogen potassium phthalate to various nominal test concentrations, LC50 was determine to be > 100 mg/l. Based on the LC50, it can be consider that the chemical was nontoxic and can be consider to be not classified as per the CLP classification criteria.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish

Effect concentration:

100 mg/L

Additional information

Based on the experimental data from various database for the target chemical and read across chemicals study have been reviewed to determine the mode of action ofhydrogen potassium phthalate (Cas no. 877-24-7)on the mortality rate and behavior of fish. The studies are as mentioned below:

 

In the first key study from experimental report. Study was conducted to access the effect of test chemical Hydrogen potassium phthalate on the growth of fish Danio rerio. Test conducted according to OECD Guideline 203 (Fish, Acute Toxicity Test). The test substance was soluble in water. Therefore, the stock solution was prepared by dissolving 400 mg of the test substance in 4 liters of potable water (passed through reverse osmosis system) with continuous one hour stirring for achieving test concentrations of 100mg/L, respectively. Potable water (passed through reverse osmosis system) was used and Zebra Fish Danio rerio were exposed to these concentration for 96 hours. Bowl aquaria containing 2 liters of potable water (passed through reverse osmosis system) were loaded with 8 fishes. A static procedure was used for the study and it was conducted in compliance with the OECD guideline 203. After 96 hours of exposure to test item Hydrogen potassium phthalate to various nominal test concentrations, LC50 was determine to be > 100 mg/l. Based on the LC50, it can be consider that the chemical was nontoxic and can be consider to be not classified as per the CLP classification criteria.

 

First study was supported by the second study for peer reviewed journal. Acute fish toxicity study was conducted on Gambusia affinis (Western Mosquitofish) for exposure period of 96 hrs. with test temperature 19 to 21 deg C and pH 3.8 to 7.0, Alkalinity:100 ppm MO in static freshwater condition. Concentrations used as 10,18,32,56 and 100 mg/l if death not observed then same series was used between 100 and 1000 mg/l again if no death observed continue with 1000 and 10000mg/l. During experiment the lethal concentration (LC50) was observed to be 180 mg/l on the basis of mortality effect. Thus based on the experimental result it is concluded that the test chemical was nonhazardous to fish.

 

Thus on the basis of overall studies chemicalhydrogen potassium phthalate (CAS no. 877-24-7) was consider as nontoxic to fishes and not classified as per the CLP classification criteria.