The government is now operating in accordance with the Guidance on Caretaker Conventions, pending the outcome of the 2025 federal election.
Name of the ingredient
Trefriw Wells mineral water (AAN)
Definition of the ingredient
Trefriw Wells mineral water is a naturally-occurring mineral water containing Fe2+ (ferrous ion), sourced from Trefriw Wells Spa, North Wales, United Kingdom.
Table 1: Ingredient specific requirements
| Test | Method reference | Acceptance criteria |
|---|---|---|
| Description | ||
| Characteristics | ||
| Assay | ||
| Appearance | Visual | Clear, colourless liquid |
| Odour | Organoleptic | Slightly metallic |
| pH | BP (Appendix V L) | 2.5-3.5 |
| Conductivity (at 20oC) | BP (Appendix V O) | 1700–2500 µS/cm |
| Turbidity | BP (Appendix IV A) | No more than 2 FTU |
| Ferrous ion (Fe2+) | Colorimetric (FerroZineTM) | 166–219 mg/L |
Table 2: Incidental constituents
| Test | Method reference | Acceptance criteria |
|---|---|---|
| Incidental metals and non-metals | ||
| Pesticide residues and environmental contaminants: (including agricultural and veterinary substances) | ||
| Other organic or inorganic impurities or toxins | ||
| Radiological quality | ||
| Microbiology | ||
| Notes | ||
| Total heavy metals | AAS | Not more than 10 ppm |
| Chromium | AAS | Not more than 50 ppb |
| Selenium | AAS | Not more than 10 ppb |
| Cyanide | Colorimetric | Not more than 50 ppb |
| Beryllium | ICP-ES1 | Not more than 60 ppb1 |
| Pesticide residues | Ph Eur method 2.8.13 | Complies |
| Gross α activity | Evaporation or Coprecipitation method1 | Not more than 0.5 Bq/L1 |
| Gross β activity | Evaporation or Coprecipitation method1 | Not more than 0.5 Bq/L1 |
| Sporothrix fungus | Culture2 | Absent in 100 mL |
| Iron-oxidising bacteria | Culture2 | Absent in 100 mL |
| While substance manufacturers are encouraged to include limits for objectionable microorganisms, it is the product into which those substances are formulated that is subject to a legally binding set of criteria. The Therapeutic Goods Order No. 77 'Microbiological Standards for Medicines' mandates that any finished product that contains the ingredient, alone or in combination with other ingredients, must comply with the microbial acceptance criteria set by Clause 9 of the Order. | ||
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Key to abbreviations
AAS: Atomic absorption spectroscopy
BP: British Pharmacopoeia
Bq/L: Becquerel/L
FTU: Formazin turbidity unit
ICP-MS: Inductively coupled plasma emission spectroscopy
NHMRC: National Health and Medical Research Council
µS/cm: micro Siemens/cm