Naptalam (Ref: ACP 322) |
![]() Last updated: 23/02/2021 |
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(Also known as: alanap; naptalam-sodium; naphthalam) |
SUMMARY |
Naptalam is a herbicide without EU approval for use. It is usually used as the sodium salt as this is more soluble. Whilst naptalam is not particularly toxic to humans its major metabolite 1-naphthylamine is a carcinogen. Its environmental fate is pH sensitive. It may pose a threat to groundwaters. Virtually non toxic to mammals, birds, honeybees and most aquatic species. No data for eathworms has been identified. |
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A pre-emergence herbicide used for the control of a wide range of weeds and grasses in food and non-food crops | |
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Annual broad-leaved weeds; Grasses | |
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Soybean; Peanuts; Cucumbers; Melons; Curcubits; Cranberries; Woody ornamentals | |
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Current | |
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1955 |
UK regulatory status |
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Not approved | ||
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Expired | ||
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No UK approval for use |
EC Regulation 1107/2009 (repealing 91/414) |
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Not approved | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Not applicable | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Expired | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Yes | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Also used in |
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Australia |
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Chemical structure |
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C₁₈H₁₃NO₃ | |
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C1=CC=C2C(=C1)C=CC=C2NC(=O)C3=CC=CC=C3C(=O)O | |
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No data | |
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JXTHEWSKYLZVJC-UHFFFAOYSA-N | |
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InChI=1S/C18H13NO3/c20-17(14-9-3-4-10-15(14)18(21)22)19-16-11-5-7-12-6-1-2-8-13(12)16/h1-11H,(H,19,20)(H,21,22) | |
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Yes |
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Common Name | Relationship | Link |
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naptalam | - | ![]() |
General status |
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Herbicide | |
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Phthalamate | |
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Synthetic | |
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Selective, absorbed by roots and to a lesser extent foliage. Inhibits indolylacetic acid transport. | |
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132-66-1 | |
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8227 | |
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030702 | |
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8594 | |
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291.30 | |
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N-1-naphthylphthalamic acid | |
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2-[(1-naphthalenylamino)carbonyl]benzoic acid | |
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Potential groundwater contaminant | |
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P | |
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19 | |
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Not applicable | |
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Not applicable | |
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Crytalline solid |
Formulations |
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Available as liquids for dilution and in granular formulations. |
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200 | C4 C = AGRITOX (click here ) 4 = Verified data |
Moderate | ||||||||
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5900 | C4 C = AGRITOX (click here ) Acetone4 = Verified data |
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20900 | C4 C = AGRITOX (click here ) Methanol4 = Verified data |
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400 | C4 C = AGRITOX (click here ) Xylene4 = Verified data |
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Insoluble | C4 C = AGRITOX (click here ) Hexane4 = Verified data |
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185 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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2.63 X 1005 | Calculated | - | |||||||
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5.42 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
High | ||||||||
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1.36 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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4.6 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
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Weak acid | |||||||||||
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0.133 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Low volatility | ||||||||
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1.94 X 1002 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
Volatile | ||||||||
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Degradation |
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36.7 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
Moderately persistent | |||||||
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Best available data US EPA; Other sources: DT₅₀ 36.7 days (DW2) | ||||||||||
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6.2 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
Moderately fast | |||||||
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2.9 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
Non-persistent | |||||||
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Soil adsorption and mobility |
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- | F3 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 3 = Unverified data of known source |
Mobile | |||||||
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20 | ||||||||||
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Best available data | ||||||||||
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Fate indices |
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4.22 | Calculated | High leachability | ||||||||||||||||||||||||||
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1.24 X 1000 | Calculated | - | |||||||||||||||||||||||||
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Low | Calculated | - | ||||||||||||||||||||||||||
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Mobile | Calculated | - |
Other known metabolites |
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1-naphthylamine Note: Carcinogenic |
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157 | Q2 Q = Miscellaneous internet resources Estimated2 = Unverified data of unknown source |
Threshold for concern | |||||||
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Not available | - | |||||||||
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1770 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
Moderate | ||||||||
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30 | L1 L = Pesticide manuals and hard copy reference books / other sources Rat1 = Estimated data with little or no verification |
High | |||||||
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> 4640 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Anas platyrhynchos4 = Verified data |
Low | ||||||||
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> 76.1 | L3 L = Pesticide manuals and hard copy reference books / other sources Oncorhynchus mykiss3 = Unverified data of known source |
Moderate | ||||||||
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> 118.5 | L3 L = Pesticide manuals and hard copy reference books / other sources Daphnia magna3 = Unverified data of known source |
Low | ||||||||
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> 1.0 | P3 P = Other governments and regulators Pseudokirchneriella subcapitata3 = Unverified data of known source |
Low | ||||||||
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> 113.2 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) 4 = Verified data |
Low | |||||||
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General |
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High (class III) | - | - | ||||||||
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1770 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
Moderate | ||||||||
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2000 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rabbit4 = Verified data |
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> 2.07 | F4 F = U.S. EPA ECOTOX database / U.S. EPA pesticide fate database / Miscellaneous WHO documents (US EPA Databases Related to Pesticide Risk Assessment ) Rat4 = Verified data |
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0.05 | L3 L = Pesticide manuals and hard copy reference books / other sources 3 = Unverified data of known source |
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Health issues |
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Possible liver toxicant |
Handling issues |
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No information available | |||
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Health: H302 Environment: H412 |
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Xn - Harmful: R20 N - Dangerous for the environment: R50 |
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S22, S24/25 | |||
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U (Unlikely to present an acute hazard) | |||
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naptalam | ||
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naptalame | ||
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Naptalam | ||
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naptalam | ||
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naptalam | ||
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naptalam | ||
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naptalam | ||
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naptalam | ||
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Record last updated: | 23/02/2021 |
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 |