Content of Chlordane in Oysters (Crassostrea rivularis) in Coastal Waters of South China and Its Spatio-Temporal Distribution
Bibliographic record
Abstract
During 2008-2012,ostrea oysters(Crassostrea rivularis) were collected in coastal waters of South China as bio-indicator of chlordane pollution of waters of the coast.Chlordane is a kind of pesticide commonly used in recent years.Contents of chlordane in soft tissues of oyster were determined by using the technology of quartz capillary column-gas chromatography-microelectron capture detector.Results show that chlordane was detected in 17 samples out of a total of 115,collected from all the 23 stations.The contents of chlordane were ranging from 2.1 to 9.3 μg·kg-1(wet weight),obviously lower than the residual limit for food safety in Canada and China,and much lower than that in European Union,Australia and Japan.The average chlordane content of the samples was 0.69 μg·kg-1w.w.in this study,relatively lower than that of the other bivalves in the waters of the Asian-Pacific coasts.Chlordane content in the oyster samples varied sharply with the location they were collected from,displaying an order of West Guangdong(1.17) East Guangdong(0.77) Hainan(0.63) the Pearl River Estuary(0.41) Guangxi(not detected).The annual mean was obviously high in 2008 reaching 1.61 μg·kg-1w.w.and gradually declined down to 0.26 μg·kg-1w.w.in 2012.The spatio-temporal variation of chlordane contents in oysters indicates that the sources of the chlordane in the habitats of the oysters are not completely fixed and not stable in intensity either.In the oyster samples,the ratio of trans-chlordane to cis-chlordane in content in the oysters was in the range from 0 to 1.58 with a mean of 0.58,which differs from that in industrial chlordane(the ratio was 1.26),indicating that the chlordane in oysters had already undergone isomer conversion or bio-degradation.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".