Overview
This review, published in Food Research International, covers analytical detection methods for three major chemical contaminant classes in tea matrices: pesticide residues (GC, HPLC, LC-MS/MS, GC-MS methods), mycotoxins (HPLC, MS, ELISA, immunochromatography), and heavy metals (ICP, AAS, immunoassay). The heavy metal section covers ICP-MS, ICP-OES, and AAS methods including sample preparation, LOD/LOQ performance, and emerging techniques. This is primarily a methodology paper rather than a concentration-survey paper; it does not report original metal measurements in tea.
Key numbers
Heavy metal analytical methods for tea (from review):
- ICP method: Capable of multi-element simultaneous analysis; ICP-MS preferred for trace-level detection
- AAS method: FAAS and GFAAS used for specific elements; GFAAS required for low-level Pb, Cd
- LOD ranges cited from underlying studies: generally sub-µg/g level by ICP-MS; AAS LODs vary by element
Contamination context (from introduction): Heavy metals are non-biodegradable, accumulate in living tissues, and cause diseases including damage to mental or central nervous system function (citing Afridi et al. 2006). EU MRLs (EC No. 42/2000 and EC No. 1881/2006) apply to tea matrices.
Methods (brief)
Narrative review of published analytical methods. Tables 2–4 compile GC, HPLC, and LC-MS/MS methods for pesticide residues. Section 4 covers heavy metal methods (ICP, AAS, immunoassay). No original measurements reported.
Limitations
This paper’s primary focus is pesticide residues and mycotoxins; heavy metals are a secondary topic covering roughly 15–20% of content. The paper does not report concentration data for metals in tea. As a 2013 review, it predates many advances in tea metal analysis and does not cover the geographic distribution literature that developed from 2015–2023. This limits its utility as a concentration reference source, though it remains useful for methodology context.
Implications
- Certification: Useful for the Testing methodology pages — documents ICP-MS as the gold-standard approach for multi-element tea analysis and AAS as an acceptable alternative for specific elements.
- Courses: Background on why different analytical methods are needed for different contaminant classes in the same food matrix.
- App: No concentration data to extract.
- Microbiome: Not applicable.
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Update history
The five most recent substantive edits to this page, classified major (evidence or structure moved), correction (a published value or statement was wrong and has been fixed), or minor (narrative rewritten without changing the underlying evidence). Each description is derived from what the edit did to this page; the linked commit is the authoritative record, routine regeneration passes are excluded, and the full version history lives in git. When DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.
| Commit | Date | Change | Description |
|---|---|---|---|
| a8052bb | 2026-08-09 | major | 7 sections added; narrative text revised |