How limits are set
The standard for each analyte is the strictest maximum level set by any credible government regulator, among them the European Union, Codex Alimentarius, the US FDA, Australia/New Zealand, the Gulf states (GSO), and the national authorities of every jurisdiction that regulates the product, converted into Vinegar (distilled, wine, balsamic, cider, rice)’s own as-consumed basis. It is a lookup of sovereign law, carrying at most one disclosed basis conversion where the law is written in another basis, and an explicit read-across where no government regulates the exact product. A certified product sits at or below every applicable sovereign limit at once.
Where no government regulates the exact product for an analyte, the standard does not go blank or invent a number: the limit is read across from the nearest government value for an analogous product, so a certified product still sits at or below a real sovereign limit. The ratchet tightens these after publication as surveillance warrants.
Master Limit Table
All values in ppb (µg/kg), as-consumed basis. 8 of 11 analytes carry a firm ceiling; the remaining 3 are toxic species bounded by their parent totals (species ≤ total, measured on every lot), so every analyte carries an enforceable ceiling. A brand meeting every value on a like-for-like basis qualifies for the mark.
| Analyte | Tier | HMTc limit | Binding basis |
|---|---|---|---|
| Lead (Pb) | Tier 1 | 500 | strictest government ML (Vietnam) |
| Cadmium (Cd) | Tier 1 | 100 | strictest government ML (Uruguay) |
| Total arsenic (tAs) | Tier 2 | 100 | strictest government ML (Uruguay) |
| Inorganic arsenic (iAs) | Tier 1 | bounded | ≤ total tAs, measured every lot (see note) |
| Mercury, total (tHg) | Tier 1 | 50 | strictest government ML (Vietnam) |
| Methylmercury (MeHg) | Tier 1 | bounded | ≤ total tHg, measured every lot (see note) |
| Nickel (Ni) | Tier 2 | 20 | government read-across (EU) |
| Total chromium (Cr) | Tier 2 | 50 | government read-across (AU) |
| Hexavalent chromium (Cr-VI) | Tier 2 | bounded | ≤ total Cr, measured every lot (see note) |
| Tin (Sn) | Tier 2 | 100000 | government read-across (EU) |
| Aluminium (Al) | Tier 2 | 200 | government read-across (EU) |
Tier 1 (Pb, iAs, Hg, MeHg, Cd) are zero-tolerance toxics with no established safe threshold. Tier 2 (tAs, Ni, Cr, Cr-VI, Sn, Al) are held to the same government limit: tiering sets how the program reacts to an exceedance, not any permission to exceed it. A product is certified only when every analyte is at or below 100% of its published limit; above the limit, on any metal, it is not certified and carries no mark.
Derivation
The full derivation for Vinegar (distilled, wine, balsamic, cider, rice). Each row lists every government maximum level in force worldwide, converted to the as-consumed basis; the HMTc limit is the strictest of them, and the last column names which sovereign law binds. A blank cell means that government sets no limit for this analyte in this product.
| Analyte | Uruguay | Vietnam | HMTc | Binds |
|---|---|---|---|---|
| Lead (Pb) | — | 500 | 500 | Vietnam |
| Cadmium (Cd) | 100 | 1000 | 100 | Uruguay |
| Total arsenic (tAs) | 100 | 200 | 100 | Uruguay |
| Inorganic arsenic (iAs) | — | — | bounded&sup5; | species ≤ tAs |
| Mercury, total (tHg) | — | 50 | 50 | Vietnam |
| Methylmercury (MeHg) | — | — | bounded&sup5; | species ≤ tHg |
| Nickel (Ni) | — | — | 20² | read-across |
| Total chromium (Cr) | — | — | 50² | read-across |
| Hexavalent chromium (Cr-VI) | — | — | bounded&sup5; | species ≤ Cr |
| Tin (Sn) | — | — | 100000² | read-across |
| Aluminium (Al) | — | — | 200² | read-across |
All values µg/kg (ppb), as-consumed basis. ² no government regulates this analyte for this exact product form: the value is a disclosed read-across from the nearest applicable government maximum, and the derivation names the instrument it comes from. It is never taken from occurrence data. After publication the standards ratchet may tighten it, using certified-lot results only. ³ not material in this matrix: measured but with no standalone number, controlled by packaging control or by the total-metal screen, not an invented value. &sup5; a toxic species governed by and bounded by its parent total (for example inorganic arsenic ≤ total arsenic): the species can never exceed the total, so the total ceiling is the species ceiling. The total metal is measured on every lot and the species is established at baseline; no separate species ceiling is published. On ongoing lots the species is speciated whenever the total exceeds its limit.
Occurrence and derivation rationale
For each analyte on the panel: what the peer-reviewed and survey literature measured in this category, cited one way to the Heavy Metal Index, and the Method v2.0 reasoning behind the certification limit, including, where no government sets a number, why the program sets one anyway. Occurrence figures are literature findings; the derivation is the certifier's.
6 studies in the certified-market pool measured lead in Vinegar across 253 certified-market samples. The pooled distribution centres on a median of 71 ppb and reaches 793 ppb at the 95th percentile. Ndungu 2004, Acosta 1993, Saei-Dehkordi 2012, Troncoso 1988, Karavoltsos 2020, Ozbek 2016.
HMTc sets 500 ppb (regulatory-alignment): the strictest applicable government maximum level for this product form, adopted under Method v2.0 as the default certification standard. The certified-market pool's P97 is 848 ppb, at or above the government ceiling of 500 ppb, so the government maximum binds. Why lead is limited →
3 studies in the certified-market pool measured cadmium in Vinegar across 158 certified-market samples. The pooled distribution centres on a median of 7.8 ppb and reaches 56 ppb at the 95th percentile. Acosta 1993, Saei-Dehkordi 2012, Karavoltsos 2020.
HMTc sets 100 ppb (regulatory-alignment): the strictest applicable government maximum level for this product form, adopted under Method v2.0 as the default certification standard. The certified-market pool's P97 is 76 ppb (provisional), against a government ceiling of 100 ppb. Why cadmium is limited →
2 studies in the certified-market pool measured total arsenic in Vinegar across 26 certified-market samples. The pooled distribution centres on a median of 66 ppb and reaches 197 ppb at the 95th percentile. Karavoltsos 2020, Troncoso 1988.
HMTc sets 100 ppb (regulatory-alignment): the strictest applicable government maximum level for this product form, adopted under Method v2.0 as the default certification standard. The certified-market pool's P97 is 232 ppb (provisional), at or above the government ceiling of 100 ppb, so the government maximum binds. Why total arsenic is limited →
1 study in the certified-market pool measured total mercury in Vinegar across 3 certified-market samples. The pooled distribution centres on a median of 0.4 ppb and reaches 1.1 ppb at the 95th percentile. Liu 2010.
HMTc sets 50 ppb (regulatory-alignment): the strictest applicable government maximum level for this product form, adopted under Method v2.0 as the default certification standard. The certified-market pool's P97 is 1.1 ppb, against a government ceiling of 50 ppb. Why total mercury is limited →
1 study in the certified-market pool measured nickel in Vinegar across 104 certified-market samples. The pooled distribution centres on a median of 107 ppb and reaches 396 ppb at the 95th percentile. Acosta 1993.
HMTc sets 20 ppb by read-across: Ni 20 ug/kg: disclosed read-across from EU eu20202184_ni_drinking_water_20 (water intended for human consumption). Filled by the completeness sweep; nearest applicable sovereign for this matrix and basis. Why nickel is limited →
The corpus holds 4 measurements of hexavalent chromium in Vinegar (97 samples reported across those studies), which the determination below is tested against: Song 2024, Karavoltsos 2020, Guo 2017, Ozbek 2016.
HMTc sets no standalone hexavalent chromium limit for Vinegar. Cr-VI is a component of Cr and bounded by it (Cr-VI <= Cr), so the Cr ceiling is the Cr-VI ceiling; no separate Cr-VI number is published. Cr is measured on every lot, and Cr-VI is speciated only when Cr exceeds its limit. The analyte is controlled by Cr-VI speciation reflexed when the parent total reaches min(species limit, 50 percent of the parent-total limit); the species never substitutes for the parent-total report, not a standalone number. Why hexavalent chromium is limited →
2 studies in the certified-market pool measured aluminium in Vinegar across 12 certified-market samples. The pooled distribution centres on a median of 2.8 mg/kg and reaches 4.8 mg/kg at the 95th percentile. Ozbek 2016, Karavoltsos 2020.
HMTc sets 200 ppb by read-across: Al 200 ug/kg: disclosed read-across from EU eu20202184_al_drinking_water_200 (water intended for human consumption). Filled by the completeness sweep; nearest applicable sovereign for this matrix and basis. Why aluminium is limited →
Risk Flag
Where certification is demanding for this subcategory, and why. These carry a natural or process background that runs above the limit: the limit being the strictest government maximum for the product, never a percentile of market data (Method v2.0). A product is not disqualified by this: only its own tested result decides certification, and a well-sourced lot can sit well below the market.
Aluminium
Grains and cereals, aluminium-based leavening agents (baking powder made with sodium aluminium sulfate or phosphate), and some tablet and capsule excipients carry high aluminium. No government sets an aluminium limit for solid infant food, so the standard holds these products to the strictest sovereign infant aluminium ceiling, the AU-NZ infant-formula limit, as a protective read-across, rather than to the only limit that names solid foods (an adult additive-residue allowance many times looser). Much of the excess comes from aluminium-based leavening, which a brand can reformulate away with aluminium-free baking powder.
Nickel
Legumes, nuts, cocoa, and oats are naturally high in nickel.
Multipliers are the ratio of the pooled occurrence median to the published limit; occurrence characterises the market only and carries no compliance weight. See the cross-category summary.
Cite this standard
Pendergrass, K. (2026). Vinegar (distilled, wine, balsamic, cider, rice): HMTc standard (Standard No. 10.83138/hmtc.std.32.vinegar). Institute of Contaminant Standards. https://doi.org/10.83138/hmtc.std.32.vinegar
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The literature baseline for every analyte is maintained independently at the Heavy Metal Index. This certification standard applies those findings; the two are kept editorially separate by design.