Nicotine sulphate was controlling pests before synthetic chemistry existed, and it stayed in commercial use for most of the twentieth century. It is no longer a registered crop protection product in the United States or the European Union. Buyers still ask about it, usually because a legacy label, an old formulation record, or an export document mentions it.
This post is background on what the compound is, what it was used for, why regulators withdrew it, and what its hazards mean. It is not use guidance, and it deliberately contains no application rates, dilution instructions, or handling procedures. NicAlliance does not market nicotine sulphate as a pesticide product in the United States, because no nicotine pesticide product is registered there.
What It Is
Nicotine sulphate is nicotine neutralized with sulfuric acid. Two nicotine molecules pair with one molecule of sulfuric acid, which gives the formula (C₁₀H₁₄N₂)₂·H₂SO₄, also written C20H30N4O4S, and a molecular weight of about 422.5 g/mol (PubChem CID 2735101). It is dark brown to black, fully water soluble, and carries a strong tobacco odor.
The nicotine share of that molecule is simple arithmetic, and it is worth doing because a solution quoted on the salt basis and the same solution quoted as free base are not the same number. Nicotine has a molecular weight of 162.23, so two nicotine units contribute 324.46 of the 422.54 total and sulfuric acid contributes the remaining 98.08. Nicotine is therefore 76.8% of the salt by mass.
Apply that to the historic commercial standard, a 40% aqueous solution at 400 g/L of nicotine sulphate. At 76.8% nicotine by mass, 400 g/L of the salt carries roughly 307 g/L of nicotine, about 30.7% w/v as free base. Salt basis and free base basis are not interchangeable: for the same solution, the free base figure runs about 23% below the salt figure. When a document says 40%, establish which of the two it means before anything else.
That 40% standard dates to the early 1900s, when nicotine sulphate solutions were among the most widely used insecticides in North America.
How It Worked
Nicotine sulphate acted as both a contact and a stomach poison. It binds nicotinic acetylcholine receptors (nAChRs) in the insect nervous system, causing persistent depolarization of the nerve cell, then uncontrolled firing, paralysis, and death. Knockdown on soft-bodied insects was fast.
This is the same receptor family that neonicotinoids target, which is not a coincidence: the neonicotinoid class was developed from the nicotine pharmacophore. The practical difference is persistence. Nicotine breaks down in soil on a scale of days, while neonicotinoids such as imidacloprid are far more persistent. That rapid breakdown was both the selling point (low residue carryover) and the limitation (no residual protection, so repeat treatment was needed against sustained pressure).
What It Was Used Against
Aphids were the classic use case, including green peach aphid (Myzus persicae), black bean aphid (Aphis fabae), and cotton aphid (Aphis gossypii). Greenhouse whitefly (Trialeurodes vaporariorum), thrips including western flower thrips (Frankliniella occidentalis), and leafhoppers such as potato leafhopper (Empoasca fabae) were also common targets.
Nicotine sulphate had a parallel history as an animal ectoparasiticide, particularly against poultry lice. That role has been taken over in regulated markets by modern veterinary actives such as ivermectin, fipronil, and spinosad, which are registered for the purpose and carry established residue and withdrawal data.
Why It Was Withdrawn
The headline facts are matters of public record, and they are stronger than a general statement that "regulations vary."
United States. EPA cancelled the last nicotine pesticide product registered in the country. The product cancellation order (74 FR 26695, 3 June 2009) covers Fulex Nicotine Fumigator, EPA Registration Number 1327-41, and states plainly that "this product registration is the last nicotine pesticide product registered for use in the United States." The cancellation took effect 1 January 2014. The order let previously registered existing stocks be used until those stocks were depleted, in a manner consistent with the previously approved labeling for the product, and permitted sale or distribution of existing stocks only until 31 December 2014, after which sale or distribution was prohibited unless solely to facilitate disposal or export. No nicotine pesticide product has been registered in the United States since. With no registered product, there is no lawful route to market nicotine sulphate for pesticide use in the country.
European Union. Commission Decision 2009/9/EC of 8 December 2008 refused to include nicotine as an active substance, required member states to withdraw authorizations for plant protection products containing nicotine by 8 June 2009, and capped any grace period at 8 June 2010. Nicotine holds no approval under Regulation (EC) 1107/2009, so there is no lawful route to agricultural use in the EU.
India. Nicotine sulphate has been banned for use in India since S.O. 325(E) of 11 May 1992 and appears on the Central Insecticides Board list of pesticides banned for use in the country with manufacture permitted for export only. Availability for export is not evidence of approval anywhere.
Everywhere else. Check the national register directly, not a neighbouring country's status and not a supplier's assurance. Australia publishes registrations through the APVMA's PubCRIS database, Great Britain through the HSE plant protection register, and most other jurisdictions maintain an equivalent public list.
The consequences of getting this wrong are not limited to a fine. Unregistered pesticide use exposes an operation to product seizure, destruction of treated crops, loss of market access, and criminal liability in some jurisdictions.
The Organic Question
Nicotine sulphate is plant derived, which leads people to assume it qualifies as an organic input. It does not, in either of the two largest schemes.
- USDA National Organic Program. Nicotine sulphate is not merely absent from the allowed list, it is expressly prohibited. 7 CFR 205.602(j) lists "Tobacco dust (nicotine sulfate)" among the nonsynthetic substances prohibited for use in organic crop production.
- European Union. EU organic production may only use plant protection products authorized under Regulation (EC) 1107/2009. Since nicotine has no such approval, the organic question never arises.
If any certification body tells you otherwise, get it in writing from that certifier before acting on it. Decertification costs far more than the pest damage it was meant to prevent.
Hazards
Nicotine sulphate is acutely toxic to humans by ingestion, inhalation, and skin contact. Nicotine passes through intact skin efficiently, which is what makes concentrated solutions dangerous in a way that the odor and appearance do not signal, and occupational fatalities from skin exposure are documented. It is also toxic to bees and to aquatic organisms.
Two points deserve emphasis because published misinformation on both is common.
There is no specific antidote for nicotine poisoning. The IPCS Poisons Information Monograph on nicotine states that "there are no known antidotes." Management is supportive and clinical: airway, breathing and circulation first, then treatment of individual symptoms. Atropine is sometimes described as the antidote for nicotine. It is not. It has a narrow role in easing specific cholinergic symptoms, and that is a treating clinician's judgment, not a site protocol. Any suspected exposure means immediate contact with emergency services or a poison center. In the United States that is Poison Help on 1-800-222-1222 (poison.org); elsewhere, use your national poison center.
Handling requirements come from the Safety Data Sheet and your regulator, not from an article. Protective equipment specifications, exposure limits, storage rules, and spill procedures are jurisdiction and product specific. Take them from the supplier's current GHS-compliant SDS and your national occupational health authority, and treat any generic protocol found online, this one included, as background reading rather than a control measure. An operation without the training and infrastructure for a compound of this toxicity should not be handling it.
What NicAlliance Supplies
NicAlliance sources its nicotine alkaloid products from STC-certified manufacturers with full chain-of-custody documentation. That range includes pharmaceutical-grade pure nicotine and nicotine dilutions at specified concentrations, with traceability supported by documented contract farming programs.
This article is background on the compound and its regulatory history. NicAlliance does not market nicotine sulphate as a pesticide product in the United States, for the straightforward reason that no nicotine pesticide product is registered there. If you are evaluating a legacy formulation or an inherited specification that calls for it, the first question is not price or lead time. It is whether the intended use is registered where you plan to use it, and in the United States and the European Union the answer is that it is not.
Frequently Asked Questions
Is nicotine sulphate still registered as a pesticide in the United States?
No. EPA's product cancellation order of 3 June 2009 (74 FR 26695) cancelled Fulex Nicotine Fumigator, EPA Registration Number 1327-41, which the order describes as the last nicotine pesticide product registered for use in the United States. The cancellation took effect on 1 January 2014. The order permitted use of existing stocks until they were depleted, in a manner consistent with the previously approved labeling, and permitted sale or distribution of existing stocks only until 31 December 2014, after which it was prohibited unless solely to facilitate disposal or export. No nicotine pesticide product has been registered in the United States since, so there is no lawful route to market one for pesticide use there.
How much free-base nicotine is in a 40% nicotine sulphate solution?
About 30.7% w/v, or roughly 307 g/L. Nicotine sulphate has the formula (C10H14N2)2 H2SO4 and a molecular weight of about 422.5 g/mol, of which the two nicotine units account for 324.46, so nicotine is 76.8% of the salt by mass. A 40% w/v solution supplies 400 g/L of the salt, and 400 multiplied by 0.768 gives about 307 g/L of nicotine. For the same solution the free base figure runs about 23% below the salt figure, so always establish which basis a specification or certificate of analysis is using.
Is nicotine sulphate approved for organic farming?
No, not in the major schemes. The USDA National Organic Program expressly prohibits it: 7 CFR 205.602(j) lists "Tobacco dust (nicotine sulfate)" among the nonsynthetic substances prohibited for use in organic crop production. In the European Union, organic production may only use plant protection products authorized under Regulation (EC) 1107/2009, and nicotine holds no such approval following Commission Decision 2009/9/EC, so it is unavailable to EU organic growers. If any certifier indicates otherwise, obtain that position in writing from the certifier before acting on it.
Is there an antidote for nicotine poisoning?
No. The IPCS Poisons Information Monograph on nicotine states that there are no known antidotes. Management is supportive and clinical, focused on airway, breathing and circulation, decontamination, and treatment of individual symptoms by qualified medical staff. Atropine is often wrongly described as the standard antidote; it has only a narrow role in easing specific cholinergic symptoms and its use is a treating clinician's decision. Any suspected exposure requires immediate contact with emergency services or a poison center, which in the United States is Poison Help on 1-800-222-1222.