Chen 2019 - Organotins in Chinese oysters

Chen and colleagues measured six organotin compounds in commercial and wild oysters from China: MBT, DBT, TBT, MPhT, DPhT, and TPhT. The paper reports commercial oyster samples from Shanghai markets and wild oyster samples from fourteen coastal cities. These are organometallic tin species reported as ng Sn g−1 dw; they are not total inorganic tin measurements.

Key numbers

The abstract reports total organotins in commercial oysters ranging from 251 to 1949 ng Sn g−1 dw (dry weight) and total organotins in wild oysters ranging from 33.3 to 2671 ng Sn g−1 dw. The same abstract states that commercial-oyster TBT and TPhT reached 68.1 ± 20.1 ng Sn g−1 dw and 747 ± 7.3 ng Sn g−1 dw, respectively.

Table 1 reports organotin concentrations in commercial oysters from Shanghai seafood markets as ng Sn g−1 dw:

Table 2 reports organotin concentrations in wild oysters from China’s coastline as ng Sn g−1 dw:

The results text reports commercial-oyster phenyltins in all samples and states that phenyltins contributed over 76% of total organotins. For wild oysters, butyltin concentrations did not differ significantly between northern and southern coastal zones, while phenyltin levels were higher in the south at 436-2564 ng Sn g−1 dw than in the north at 18.8-59.1 ng Sn g−1 dw.

Methods (brief)

Commercial oysters were purchased from Shanghai seafood markets in November 2014, and wild oysters were collected from fourteen coastal Chinese cities in March 2015. More than 20 individuals per sample were purchased or collected, edible tissues were freeze-dried, ground, homogenized, and stored at −20 °C. Six organotins were extracted from 0.5 g freeze-dried oyster powder using acetic-acid/methanol with tropolone, purified, derivatized with NaBEt4, and measured by GC-MS. The method used tripropyltin as internal standard, ERM-CE477 for butyltin validation, spiked blank oysters for recovery, and reports LODs <4 ng Sn·g−1 dw for all target analytes.

Implications

This source contributes shellfish occurrence evidence for organotin tin species in oysters from China. The source is directly routeable to the shellfish product row as organotin context, with TBT/DBT/MBT and TPhT/DPhT/MPhT retained as separate species rather than collapsed into total Sn. The dry-weight basis and oyster-specific matrix should be preserved for any later structured extraction or pooling decision.

Verification notes

• PDF text extracted with pdftotext -layout; title page, methods, Tables 1-2, results, risk-assessment section, and conclusion were readable.
• DOI 10.1016/j.scitotenv.2018.09.310, raw handle MFK_chen2019, and cite-key checks found no existing source page before creation.
• Tables 1 and 2 were checked against the extracted text. Units are preserved as ng Sn g−1 dw; no conversion was performed. The commercial-oyster table repeats SHS1 and SHS2 labels in the extracted text; the labels were copied as extracted rather than corrected.
• Speciation: all values are organotin species, not total Sn or inorganic tin. The frontmatter uses Sn only to route the organometallic tin evidence.
• Brand firewall: the source uses market/site codes and city locations only; no sampled product brand names were reported.
• Frontmatter product and ingredient slugs were checked against docs/gpt-collaboration/taxonomy-snapshot.md; no new slug was invented.

Page history

The five most recent substantive edits to this page. 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.