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New monitoring approaches and national heat‑maps help target 6PPD quinone hotspots
Summary
Researchers and agencies described large‑scale monitoring networks, high‑throughput lab methods and a USGS national heat‑index tool aimed at prioritizing sampling and retrofit investments where 6PPD quinone exposure risk to salmonids is highest.
A substantial portion of Day 1 focused on where and how to measure 6PPD quinone in the environment. Presentations ranged from volunteer‑led, high‑throughput programs on Vancouver Island to a U.S. Geological Survey national heat‑index and local real‑time field mass‑spectrometry demonstrations.
Tanya Brown (Simon Fraser University) and colleagues reported monitoring across nearly 100 sites and roughly 2,000 samples in British Columbia; early findings show many salmon‑bearing streams exceed screening values during wet weather and that land‑use variables such as road and commercial cover correlate with higher event concentrations. "78% of our sites monitored did have concentrations that exceed threshold values during wet weather events," she said, summarizing the first 41‑site deep dives.
On methods, Haley Tomlin (BC Conservation Foundation) and Eric Kroger (Vancouver Island University) described cost‑effective and high‑throughput analytical pipelines including a CPMIMS workflow and an autosampler retrofit that allowed dozens to hundreds of samples per day. Kroger's team also demonstrated a membrane immersion probe enabling near‑real‑time field measurements and emphasized that concentrations vary dramatically across short spatial scales — sometimes from non‑detect to hundreds of nanograms per liter within a kilometer.
At national scale, Stephanie Gordon (USGS) introduced an interactive web mapping tool and a relative heat index built from road length, traffic density, airports, tire handling facilities and basin hydrology to prioritize sampling. The tool is accompanied by downloadable tabular data and filters designed to let local teams incorporate better local traffic inputs where available.
Why it matters: monitoring design matters — passive samplers are useful for screening while autosamplers and time‑series approaches are necessary to capture fast storm pulses and quantify exposure duration. Presenters recommended combining screening networks with targeted event sampling at predicted hotspots.
