1-naphthylacetic acid |
![]() Last updated: 12/01/2021 |
![]() |
(Also known as: NAA; alpha-NAA; naphthylacetic acid; 1-NAA) |
|
![]() |
|
A synthetic auxin used as a plant growth regulator to control top fruit pre-harvest fruit drop, for fruitlet thinning and for striking hard and softwood cuttings. Also a metabolite. | |
---|---|---|
|
Fruit drop | |
|
Top fuit including apples, pears, plums, cherries; Potatoes | |
|
- | |
|
Unknown | |
|
1939, first report, circa 1960 introduced |
UK regulatory status |
|
Approved | ||
---|---|---|---|
|
31/12/2024 | ||
|
None |
EC Regulation 1107/2009 (repealing 91/414) |
|
Approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Hungary/France | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
31/12/2021 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
No | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|
|
Also used in |
|
- |
---|
Chemical structure |
|
- | |
---|---|---|
|
C₁₂H₁₀O₂ | |
|
C1=CC=C2C(=C1)C=CC=C2CC(=O)O | |
|
No data | |
|
PRPINYUDVPFIRX-UHFFFAOYSA-N | |
|
InChI=1S/C12H10O2/c13-12(14)8-10-6-3-5-9-4-1-2-7-11(9)10/h1-7H,8H2,(H,13,14) | |
|
Yes |
|
![]() |
Common Name | Relationship | Link |
---|---|---|
1-naphthylacetic acid | - | ![]() |
General status |
|
Plant growth regulator | |
---|---|---|
|
Soil | |
|
Synthetic auxin | |
|
980 g kg⁻¹ | |
|
EU dossier - 1-NAD | |
|
Synthetic | |
|
Absorbed through roots, stems and leaves, demonstrates auxin-like activity | |
|
86-87-3 | |
|
201-705-8 | |
|
313 | |
|
056002 | |
|
6862 | |
|
186.21 | |
|
- | |
|
2-naphthalen-1-ylacetic acid | |
|
1-naphthylacetic acid | |
|
- | |
|
- | |
|
Not applicable | |
|
Not applicable | |
|
Not applicable | |
|
Not applicable | |
|
- | |
|
White to yellow crystalline powder | |
|
Formulations |
|
|
|||
---|---|---|---|---|
|
|
|||
|
|
|||
|
Usually supplied as wettable powders, soluble concentrates and dustable powders |
|
![]() |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
16.8 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Low | ||||||||
|
588 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) n-Heptane5 = Verified data used for regulatory purposes |
- | ||||||||
24340 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Xylene5 = Verified data used for regulatory purposes |
- | |||||||||
250000 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Methanol5 = Verified data used for regulatory purposes |
- | |||||||||
133700 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Acetone5 = Verified data used for regulatory purposes |
- | |||||||||
|
130 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
- | ||||||||
|
322.2 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
- | ||||||||
|
360 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 4 = Verified data |
- | ||||||||
|
Not expected to self ignite; Not highly flammable | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
- | ||||||||
|
|
9.55 X 10-01 | Calculated | - | |||||||
|
-0.02 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Low | ||||||||
|
- | - | - | ||||||||
|
4.23 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
- | ||||||||
Weak acid | |||||||||||
|
1.27 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Low volatility | ||||||||
|
3.03 X 10-04 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Non-volatile | ||||||||
|
Acidic solution: 233nm = 72500 Neutral solution: 233nm = 79600 Basic solution: 282nm = 7020 |
A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
- | ||||||||
|
35.9 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
- |
Degradation |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
- | ||||||||||
|
|
42 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 4 = Verified data |
Moderately persistent | |||||||
|
41.7 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 4 = Verified data |
Moderately persistent | ||||||||
|
- | - | - | ||||||||
|
136 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 4 = Verified data |
Persistent | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
EU dossier lab studies DT₅₀ range 6.4 days (sandy loam) - 77 days (loamy sand), DT₉₀ range 14.7-257 days; General literature states DT₅₀ 30-50 days | ||||||||||
|
|
- | - | - | |||||||
|
- | ||||||||||
|
|
- | - | - | |||||||
|
- | ||||||||||
|
|
2.9 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 4 = Verified data |
Moderately fast | |||||||
|
- | ||||||||||
|
|
Stable | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Stable | |||||||
|
Stable pH 4,7 & 9 | ||||||||||
|
9.5 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Fast | ||||||||
|
7.0 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Moderately fast |
Soil adsorption and mobility |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
|
1.39 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Moderately mobile | |||||||
|
84.8 | ||||||||||
|
EU dossier Kd range 0.42-2.72 mL g⁻¹, Koc range 46.1-138.0 mL g⁻¹, Soils=3 | ||||||||||
|
|
1.39 | A4 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 4 = Verified data |
Mobile | |||||||
|
61.2 | ||||||||||
|
0.842 | ||||||||||
|
EU dossier Kf range 0.31-1.73, Kfoc range 44.65-86.53 mL g⁻¹, 1/n range 0.822-0.864, Soils=3 | ||||||||||
|
No |
Fate indices |
|
|
|
|
||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
3.59 | Calculated | High leachability | ||||||||||||||||||||||||||
|
|
6.16 X 10-01 | Calculated | - | |||||||||||||||||||||||||
|
- | ||||||||||||||||||||||||||||
|
Medium | Calculated | - | ||||||||||||||||||||||||||
|
Moderately mobile | Calculated | - |
Other known metabolites |
|
|
|
|
|
|||||
---|---|---|---|---|---|---|---|---|---|
1-naphthalene methanol | - | Water | 0.053 | - | |||||
1-methyl naphthalene | - | Water | 0.049 | - | |||||
1-naphthaldehyde | - | Water | 0.175 | - | |||||
phthalic acid | - | Water | 0.127 | - | |||||
1-napthoic acid Note: DT50 ~ 6 days |
- | Soil | 0.247 | - |
|
![]() |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
|
Low risk | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Based on LogP < 35 = Verified data used for regulatory purposes |
Low risk | |||||||
|
- | - | |||||||||
|
> 1750 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Rat5 = Verified data used for regulatory purposes |
Moderate | ||||||||
|
|
- | - | - | |||||||
|
- | - | |||||||||
|
- | - | - | ||||||||
|
> 2510 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Coturnix japonica5 = Verified data used for regulatory purposes |
Low | ||||||||
|
> 1606 mg kg⁻¹ BW/day | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Coturnix japonica5 = Verified data used for regulatory purposes |
- | ||||||||
|
- | - | - | ||||||||
|
> 56 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Oncorhynchus mykiss5 = Verified data used for regulatory purposes |
Moderate | ||||||||
|
10 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Oncorhynchus mykiss5 = Verified data used for regulatory purposes |
Moderate | ||||||||
|
> 56 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Daphnia magna5 = Verified data used for regulatory purposes |
Moderate | ||||||||
|
> 22 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Daphnia magna5 = Verified data used for regulatory purposes |
Low | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
5.09 | A3 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Lemna gibba3 = Unverified data of known source |
Moderate | ||||||||
|
- | - | - | ||||||||
- | - | - | |||||||||
|
18.05 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Pseudokirchneriella subcapitata biomass5 = Verified data used for regulatory purposes |
Low | ||||||||
|
- | - | - | ||||||||
|
|
> 120 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes |
Low | |||||||
|
- | - | - | ||||||||
|
- | - | - | ||||||||
|
|
- | - | - | |||||||
- | |||||||||||
|
- | - | - | ||||||||
- | |||||||||||
|
|
- | - | - | |||||||
|
- | - | - | ||||||||
|
|
- | - | - | |||||||
|
- | ||||||||||
|
|
- | - | - | |||||||
|
- | ||||||||||
|
> 1000 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Eisenia foetida5 = Verified data used for regulatory purposes |
Low | ||||||||
|
- | - | - | ||||||||
|
|
- | - | - | |||||||
|
- | - | - | ||||||||
|
|
42.0 | Mortality A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Typhlodromus pyri5 = Verified data used for regulatory purposes |
- |
|
- | - | - | |||
|
|
42.0 | Mortality A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Aphidius rhopalosiphi5 = Verified data used for regulatory purposes |
- |
|
- | - | - | |||
|
Nitrogen mineralisation: No significant adverse effect Carbon mineralisation: No significant adverse effect |
A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) 5 = Verified data used for regulatory purposes 0.1 mg kg⁻¹ 1-NAA |
- | ||||||||
|
|
- | - | - |
|
- | - | - |
|
![]() |
General |
|
|
|
|
||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
|
High (class III) | - | - | ||||||||
|
> 1750 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Rat5 = Verified data used for regulatory purposes |
Moderate | ||||||||
|
2000 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Rat5 = Verified data used for regulatory purposes |
- | ||||||||
|
> 0.45 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Rat (whole body)5 = Verified data used for regulatory purposes |
- | ||||||||
|
Intraperitoneal LD₅₀ = 100 mg kg⁻¹ | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) Rat3 = Unverified data of known source |
- | ||||||||
Subcutaneous LD₅₀ = 733 mg kg⁻¹ | V3 V = ChemID online databases / IPCS INCHEM (ChemID; IPCS INCHEM ) Mouse3 = Unverified data of known source |
- | |||||||||
|
0.10 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Rat SF=1505 = Verified data used for regulatory purposes |
- | ||||||||
|
0.10 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Rat SF=1505 = Verified data used for regulatory purposes |
- | ||||||||
|
- | - | - | ||||||||
|
0.07 | A5 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) Rat SF=1705 = Verified data used for regulatory purposes |
- | ||||||||
|
70 | A3 A = EU regulatory and evaluation data as published by EC, EFSA (RAR, DAR & Conclusion dossiers), EMA (e.g. EU Annex III PIC DGD) (EU - Pesticides database; EFSA Scientific Publications ) default3 = Unverified data of known source |
- | ||||||||
|
- | - | - | ||||||||
|
|
Acceptable risk for proposed uses | |||||||||
|
PPE/PPC advised to mitigate exposure risks | ||||||||||
|
|
||||||||||
|
- | - | - | ||||||||
|
- | - | - |
Health issues |
|
|
||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Possible blood toxicant |
Handling issues |
|
|
|||
---|---|---|---|---|
|
Not explosive or oxidising | |||
|
Health: H302, H315, H318, H319. H335 Environment: H412 |
|||
|
Xn - harmful: R22 Xi - Irritant: R36 |
|||
|
S1/2, S24/25, S26, S37/39, S45 | |||
|
III (Slightly hazardous) | |||
|
- | |||
|
- |
|
![]() |
|
|
||
---|---|---|---|
|
1-naphthylacetic acid | ||
|
acide naphthylacetique | ||
|
Naphthyl-1-essigsaeure | ||
|
- | ||
|
- | ||
|
acido 1-naftilacetico | ||
|
- | ||
|
- | ||
|
- | ||
|
- | ||
|
- |
Record last updated: | 12/01/2021 |
Contact: | aeru@herts.ac.uk |
Please cite as: | Lewis, K.A., Tzilivakis, J., Warner, D. and Green, A. (2016) An international database for pesticide risk assessments and management. Human and Ecological Risk Assessment: An International Journal, 22(4), 1050-1064. DOI: 10.1080/10807039.2015.1133242 |