77912

Watermark Limnological Weighted Secchi Disc

Watermark Limnological Weighted Secchi Disc

Description

This 20cm diameter secchi disc is made of Sintra PVC.

Features

  • Silk screened with black and white quadrants
  • Stainless steel hardware
  • Built-in 24 oz. zinc sounding weight
Your Price
$62.49
Usually ships in 3-5 days

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Details

Silk screened with black and white quadrants, the WaterMark limnological 20cm diameter weighted secchi disc is made of Sintra PVC.
Notable Specifications:
  • 20 cm diameter secchi disc
  • 24 oz. zinc sounding weight
What's Included:
  • (1) Stainless steel hardware secchi disc
  • (1) Built-in 24 oz. zinc sounding weight
Image Part # Product Description Price Stock Order
Watermark Limnological Weighted Secchi Disc 77912 Limnological weighted secchi disc
$62.49
Usually ships in 3-5 days

In The News

Long-term Secchi disk records show Lake Tahoe clarity decline has stabilized

Lake Tahoe is one of the clearest lakes in the United States, helped by the relatively small size of its surrounding watershed and the granitic basin it sits in. Around 1968, the first year that its clarity was measured by Secchi disk, Tahoe’s blue waters were even clearer than they are today. Measurements at that time show an average yearly clarity of more than 100 feet. But such clarity was never reported again as its waters began a decline that lasted well into the 1990s. At that point, the decline of average annual clarity measurements leveled out and stabilized, which is better news than it sounds.

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Secchi Dip-in encourages citizen monitoring this summer

A monitoring initiative named for Secchi disks encourages people across the world to test the water nearby from the end of June through mid-July. It’s called the Secchi Dip-in and its organizers want anyone with the means to test their local water to do so and report back.  The database is open to contributions from June 29 through July 21. Volunteers, monitoring groups and professionals alike can contribute data to the Secchi Dip-in database.  Turbidity data is the main information Secchi Dip-in organizers want to see, but they won’t turn down any kind of water quality data people contribute. They encourage interested environmentalists to go out with someone who is experienced in testing for water quality to ensure data is accurate.

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Seeking an Elegant, Affordable Solution to Contamination

Dr. Charley Liberko of Cornell College's Department of Chemistry has an idea he's working to bring to fruition. “Imagine a remote village in an underdeveloped country whose only source of water is a stream contaminated with toxic levels of metal ions such as cadmium and nickel,” states Dr. Liberko. “The villagers take locally available woody plant material, soak it in potash, and heat it up for several days until the wood partially decomposes. They then filter their water through this material to remove the metal ions. When they are done with it, they put the material in a clay pot and heat it up even hotter until the organic matter decomposes completely, leaving the metal ion salts as a residue, safely in the clay pot.

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