Topic
Sampling and measuring pollutants such as nutrients, sediment and PFAS in rivers, lakes and coastal waters to track contamination and trends over time.
A Florida State-led Nature Water review argues ultrahigh-resolution mass spectrometry can read human impact in water from dissolved organic matter. It pools studies from many aquatic systems, so the case depends on how well a few markers hold up from site to site.
Reality
Cornell undergraduates screened 500-plus samples from 300 bodies of water for 24 PFAS and mapped the results. Sites over New York guidance values are largely in standing water near airports and fire training stations.
Reality
Researchers at UCLA and UC Santa Barbara report in Science that the rare 15N15N form of nitrogen gas tracks how much nitrogen microbes convert to gas. Air dissolved in water normally hides that microbial gas, so the signal shows nitrogen removal that conventional methods obscure.
Reality
Counts ran from 5 to 48 particles per liter at springs in the Eastern Cape and KwaZulu-Natal. With no agreed safe level for freshwater, the researchers offer the figures as a baseline to track over time.
Reality
Grab bottles and passive in-stream samplers, run side by side for two growing seasons, produced records that disagree about where contamination concentrates and when it peaks. Penn State's team says a program needs both.
Reality
Up to 37 years of monitoring on seven Queensland river systems show nitrogen and sediment falling. Fertilizer use is down as much as 49 percent from its peak; the rivers moved a lot less.
Reality