1-[(2-chloro-4-nitrophenyl)azo]-2-naphthol

Toxicity to soil macroorganisms except arthropods

Administrative data

Endpoint:

toxicity to soil macroorganisms except arthropods: long-term

Type of information:

migrated information: read-across based on grouping of substances (category approach)

Adequacy of study:

key study

Study period:

2013

Reliability:

1 (reliable without restriction)

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 222 (Earthworm Reproduction Test (Eisenia fetida/Eisenia andrei))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

1-(4-methyl-2-nitrophenylazo)-2-naphthol

EC Number:

219-372-2

EC Name:

1-(4-methyl-2-nitrophenylazo)-2-naphthol

Cas Number:

2425-85-6

Molecular formula:

C17H13N3O3

IUPAC Name:

1-[(4-methyl-2-nitrophenyl)diazenyl]-2-naphthol

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Sampling and analysis

Analytical monitoring:

no

Test substrate

Vehicle:

no

Test organisms

Test organisms (species):

Eisenia fetida

Study design

Study type:

laboratory study

Substrate type:

artificial soil

Limit test:

no

Total exposure duration:

4 wk

Results and discussion

Effect concentrations

Effect concentrations 1

Duration:

28 d

Dose descriptor:

NOEC

Effect conc.:

>= 1 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Effect concentrations 2

Duration:

28 d

Dose descriptor:

LOEC

Effect conc.:

>= 1 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality

Effect concentrations 3

Duration:

28 d

Dose descriptor:

NOEC

Effect conc.:

>= 1 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

other: Body weight change

Effect concentrations 4

Duration:

28 d

Dose descriptor:

LOEC

Effect conc.:

>= 1 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

other: Body weight change

Effect concentrations 5

Duration:

56 d

Dose descriptor:

NOEC

Effect conc.:

>= 1 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

reproduction

Effect concentrations 6

Duration:

56 d

Dose descriptor:

LOEC

Effect conc.:

>= 1 000 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

reproduction

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

LOEC was >1000 mg/kg dry soil.

Executive summary:

The toxic effects of C.I. Pigment Red 3 on survival, growth, and reproduction of the earthwormEisenia fetidawere assessed during a test period of eight weeks based on the OECD Guidelines for Testing Chemicals, Test No. 222 (April 2004), the International Standards11268‑2: 1998(E) and theGuideline “Richtlinien für die Prüfung von Pflanzenschutzmitteln im Zulassungsverfahren“ Part VI, 2-2, January 1994.

 

C.I. Pigment Red 3 was homogeneously mixed into artificial soil at the following test concentrations: 62.5, 125, 250, 500 and 1000 mg per kg dry soil. Additionally, a control and a reference item treatment (Derosal with 60% Carbendazim (w/w)) were tested in parallel.

 

Adult earthworms were exposed in treated soils for a period of four weeks. After this period, the adults were removed from the test vessels and the survival and growth rate were determined. The cocoons and juvenile earthworms remained in the vessels for additional four weeks. The reproduction rate was determined by counting the number of offspring hatched from the cocoons after this additional test period of four weeks.

 

Summary of effects on earthworms exposed toC.I. Pigment Red 3: In conclusion, taking into account the survival, growth and reproduction rates of the exposed adult test organisms, the highest concentration of C.I. Pigment Red 3 without toxic effects on Eisenia fetida (NOEC) after the test period was determined to be 1000 mg/kg dry soil. This value might even be higher but the highest test concentration tested was 1000 mg/kg dry soil. Accordingly, the lowest concentration with toxic effects (LOEC) was >1000 mg/kg dry soil.

 

The reproduction rate of Eisenia fetida in the positive control was completely inhibited. Thus, the results of the positive control demonstrated satisfactory test conditions.