Geospatial Assessment of Trace-Level Benzophenone-3 in a Fish-Bearing River Using Direct Mass Spectrometry
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Benzophenone-3 (2-hydroxy-4-methoxybenzophenone) is present in many sunscreens/cosmetics due to its UV-filtering properties and has consequently been observed in recreational waters. There are growing concerns about endocrine disruption in aquatic organisms and broader impacts in freshwater and marine systems. Therefore, there is value in cost-effective, sensitive techniques that allow for high-density, spatiotemporal data to protect environmental health and inform public policy. Condensed-phase membrane introduction mass spectrometry coupled with liquid electron ionization with in situ chemical ionization (CP-MIMS-LEI/CI) is a novel direct tandem MS technique that fulfills these criteria and was applied for the direct measurement of benzophenone-3 in environmental water samples without any sample preparation. We report results that are sensitive (20 ng/L detection limit), reproducible (11% interday variability), and comparable to those of liquid chromatography tandem mass spectrometry (LC–MS/MS) for environmental samples (n = 4; 12–24% different). CP-MIMS-LEI/CI was applied to samples (n = 33) from the Cowichan River and Cowichan Lake (British Columbia, Canada), an important fish-bearing system significant to First Nations culture, salmonid production, and recreation. The quantitative analysis afforded by CP-MIMS-LEI/CI enabled geospatial benzophenone-3 analysis, identifying elevated concentrations (>180 ng/L) associated with local recreational activity. LC–MS/MS measurements for samples from two locations suggest a correlation between the number of swimmers and benzophenone-3 concentrations (R2 = 0.88 and 0.94).
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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 | 0.000 | 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 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 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 it