YSI 1004 Ammonium (ISE) Sensor
Features
- Freshwater use only
- Best for sampling applications
- Field-replaceable
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
When the probe is immersed in water, a potential is established across the membrane that depends on the relative amounts of ammonium in the sample and the internal filling solution. This potential is read relative to the reference electrode of the instrument pH probe. As for all ISEs, there is a linear relationship between the logarithm of the ammonium activity (or concentration in dilute solution) and the observed voltage. The Nernst equation describes this relationship.
- 6-month warranty
In The News
Not So Quiet Polar Night: Arctic Creatures Found to be Active During Dark Part of the Year
Most people need little more than a comfortable pillow, a blanket, and a dark room to drift off into a multi-hour snooze. Many researchers assumed that once plunged into darkness for about half the year during the polar night, most polar creatures would do the same: fall asleep and take a big nap for as long as the darkness lasted. But Jon Cohen, associate professor of marine sciences, school of marine science and policy, in the College of Earth, Ocean, and the Environment at the University of Delaware, wondered if that was true. Despite the technical challenges of monitoring biota in very low light conditions, Cohen and his team were determined to find out if krill, copepods, and other creatures were dozing off in the dark or seeking out prey, light, and each other.
Read MoreOrange Stream Dreams: Monitoring Acid Mine Drainage and Watershed Health
Not many young people pondering careers come up with the words “acid mine drainage.” But Jen Bowman, Director of Environmental Programs at the Voinovich School at Ohio University, could not help but be fascinated by what she saw during her days as an Ohio University student collecting field samples. “My interest in acid mine drainage, and how it affects watersheds, goes way back to my undergraduate days,” she explains. “We saw firsthand how streams could be impacted by drainage from abandoned mines. Sometimes streams had such severe problems they turned orange. It was hard not to be struck by that. I was drawn in to the many associated challenges, keeping watersheds clean, and improving stream health.
Read MoreSummer 2022 Environmental Monitor Available Now
Summer 2022 Environmental Monitor 
From the continuous monitoring occurring in the Susquehanna River Basin region of the United States to a volcanic crater lake in Costa Rica , this latest edition of the Environmental Monitor covers a variety of remote monitoring methods. Empowered by cloud data, researchers in Malaysia, Australia, the United Kingdom , the United States and elsewhere spent the year gathering data and publishing their findings to the public. 
 
Other topics include highlighting the work of science professionals that are dedicated to harnessing data. This edition showcases the diversity of science by featuring stories from a marine technician in Antarctica , an outreach specialist in Michigan , and researchers from across the world.
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