A container survey extracted and chemically identified particles after sequential room-temperature and hot-water flushing.
Source details
Jun Hu, Xin Xu, Ying Song, Wenqi Liu, Jianqiang Zhu, Hangbiao Jin, Zhu Meng. Toxics. 2022.
Findings
Following sequential room-temperature and hot-water flushing, the paper reported 3–43 items/container. This is a range across sampled containers, not a usual-use release rate. ATR-FTIR identified the selected particles, with PP predominant and PE and polyester also present.
Methods and scope
PP takeaway containers were first flushed with pure water at 25 °C (100 mL, 60 rpm, 20 min, three rounds), then 95 °C (100 mL, 60 rpm, 30 min, three rounds). Combined rinses were filtered at 50 µm. ATR-FTIR was applied to all selected particles; matches above 70% were accepted. Procedure-blank counts were subtracted.
What this source can support
Direct evidence on particles extracted from PP takeaway containers under this sequential washing protocol.
The combined rinse is not a single meal, typical use, or measured ingestion. Non-PP polymers and fibers may include manufacturing/storage contamination. QA text inconsistently mentions 15 control experiments and 10 evaluated controls. Missing supplementary materials were not used.
Related evidence
Reported values and source locations
| Reported value | Measurement basis | Conditions and size context | Original document location |
|---|---|---|---|
| 3–43 items/container | Observed sample range, not a mean or uncertainty interval | Combined sequential 25 °C and 95 °C pure-water flushes; three rounds each Recorded particles 50–5000 µm; FTIR lower limit reported as 50 µm | PDF p. 4 §3.1; p. 6 Table 1; methods pp. 3–4 |
Source provenance
Primary PDF SHA-256: cec1e8fa034e64b85b41270560fb04dff6d7affeca772be380d2b47d8c6529e2
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