Ethylene oxide: why EU spice consignments get rejected

Ethylene oxide is the one residue where there is nothing to argue about at the border. There is no tolerance to negotiate, no agronomic explanation, and no way to fix a lot after the fact. It is worth understanding exactly how the limit is built, because the way it is written catches consignments that look clean on a casual reading of a test report.

The limit is a limit of quantification, not a safety level

Ethylene oxide is not authorised as a plant protection active substance in the EU under Regulation (EC) No 1107/2009, and it is classified as mutagenic, carcinogenic and toxic for reproduction, category 1B. For a substance with those properties no safe consumer threshold is set. So the maximum residue levels in Regulation (EC) No 396/2005 are set at the limit of quantification, and EFSA notes that depending on the commodity that LOQ sits between 0.02 and 0.1 mg/kg.

Two numbers matter to most people reading this. The MRL for spices was lowered to 0.1 mg/kg in 2015, having previously been 0.2 mg/kg for oilseeds, teas, cocoa and spices. Sesame seed sits at 0.05 mg/kg. Cereals are at 0.02 mg/kg. Check the exact figure for your commodity code before you contract — the annexes are amended regularly and the number is not the same across the basket.

The part that catches people is the residue definition. It is the sum of ethylene oxide and 2-chloroethanol, expressed as ethylene oxide — in practice, ethylene oxide plus 0.55 times the 2-chloroethanol figure. Ethylene oxide itself dissipates. 2-chloroethanol does not. A lot treated months earlier can show no detectable ethylene oxide and still fail on the chlorohydrin alone. If a test report gives you one figure and no breakdown, you cannot tell whether the sum rule was applied.

The same 0.1 mg/kg sum limit applies to food additives under Commission Regulation (EU) 2022/1396, irrespective of the origin of the residue. That is relevant if you buy blends: a carrier, gum or colour brought into a masala can carry the residue into a finished product that was never treated itself.

Where in the chain it actually happens

Ethylene oxide is not a field input. It is a post-harvest microbial reduction treatment, applied to dry material in a chamber. That is the whole point of understanding the chain: no amount of good farming prevents it, and a residue tells you something about which hands the lot passed through after drying, not about the farm.

The realistic entry points are a sterilisation service used on the lot to bring down plate counts or Salmonella risk, previously treated stock or shared chamber and warehouse space, and bought-in ingredients inside a blend. When the EU reference laboratory looked at official sesame samples during the 2020 incident, the levels found mostly ran between 0.1 and 10 mg/kg — one to two orders of magnitude above the limit. These are not borderline analytical findings. A treated lot is obviously treated.

The practical consequence for a buyer is that your specification has to say what microbial reduction method is permitted, and the answer has to be steam or nothing. Writing a microbial specification that is only achievable by gas treatment, and separately demanding a nil ethylene oxide result, is a contradiction you will eventually pay for.

What the EU border does now

Implementing Regulation (EU) 2019/1793 runs two lists. Annex I is a raised frequency of identity and physical checks. Annex II adds special conditions: an official certificate and analytical results from the country of origin, travelling with the consignment.

This changed on 28 January 2026. Commission Implementing Regulation (EU) 2026/194 moved peppers of the genus Piper, and dried or crushed or ground fruit of the genus Capsicum or of the genus Pimenta, from India out of Annex II and into Annex I, with identity and physical checks set at 20 per cent of consignments for the ethylene oxide risk. Vanilla and cloves from India, under increased controls for ethylene oxide since January 2022, were removed from Annex I entirely on the basis of satisfactory compliance. Calcium carbonate from India stays under Annex II special conditions but the frequency drops to 30 per cent. The regulation entered into force on the twentieth day after publication in the Official Journal.

So for chilli and pepper the origin certificate obligation has gone, but one container in five is still opened and sampled, and it sits at the border control post until the laboratory reports. Build that into your lead time rather than your dispute file. These lists are reviewed roughly every six months; read the consolidated version of 2019/1793 before you fix a shipping date, not a summary of it.

What testing every lot has to mean

Ethylene oxide does not appear in a general multiresidue pesticide screen by default. It needs a dedicated method, and the laboratory reports ethylene oxide and 2-chloroethanol separately. In EU proficiency testing the minimum reporting level for ethylene oxide has been set at 0.02 mg/kg, so laboratories can work well below the spice MRL.

Four things to look for on the report before you accept it:

• Both analytes reported, with the sum expressed as ethylene oxide.
• An LOQ stated, and at or below the MRL for that specific commodity.
• The lot or batch identified, matching the marks on the bags.
• The sampling basis stated — how many incremental samples, from how many bags.

In a mixed container each product is a separate lot and needs its own result. We ship 1,000 kg minimum per product and certificates of analysis travel with the documents, which means a mixed container generates several reports, not one.

An honest note

A pre-shipment certificate is evidence, not immunity. The official sample is a different sample, taken at the border, by a different laboratory, with its own measurement uncertainty. What a pre-shipment result does is make a treated lot almost impossible to ship by accident, and give you something concrete to put in front of a competent authority if a consignment is held. Ask for the method and the LOQ before you place the order, not after the container is detained.

Sources

• Residue definition as sum of ethylene oxide and 2-chloroethanol expressed as ethylene oxide; MRL history — 0.2 mg/kg for oilseeds, teas, cocoa and spices, lowered to 0.1 mg/kg for spices in 2015; 0.02 mg/kg for cereals; EU MRL for sesame 0.05 mg/kg; levels found in official sesame samples mostly 0.1 to 10 mg/kg. — eurl-pesticides.eu
• EFSA statement: ethylene oxide no longer authorised as a pesticide under Regulation (EC) 1107/2009, classified CMR category 1B, no safe consumer threshold can be set, MRLs in Regulation 396/2005 set at the LOQ varying between 0.02 and 0.1 mg/kg depending on commodity. — pmc.ncbi.nlm.nih.gov
• Commission Regulation (EU) 2022/1396: no residue above 0.1 mg/kg of ethylene oxide (sum of ethylene oxide and 2-chloroethanol expressed as ethylene oxide, i.e. ethylene oxide + 0.55 x 2-chloroethanol), irrespective of origin, in food additives. — eur-lex.europa.eu
• Commission Implementing Regulation (EU) 2026/194 of 28 January 2026: peppers of the genus Piper and dried/crushed/ground Capsicum or Pimenta from India moved from Annex II to Annex I at 20% identity and physical checks; vanilla and cloves from India deleted from Annex I; calcium carbonate from India reduced to 30% in Annex II; entry into force on the twentieth day after OJ publication. — eur-lex.europa.eu
• EU MRL for ethylene oxide in sesame seed is 0.05 mg/kg and equals the limit of quantification under Regulation (EC) No 396/2005; it is a sum MRL. — rivm.nl
• Minimum required reporting level for ethylene oxide in EU proficiency testing set at 0.02 mg/kg; ethylene oxide banned in the EU and MRLs set at the LOQ. — eurl-pesticides.eu
• Regulation (EC) No 396/2005 is the instrument under which MRLs and their annexes are established. — eur-lex.europa.eu