SEAL Analytical Monthly Newsletter -
November 2021
Colorimetric History: Greiss Reaction
Standard Methods 4500-NO2 uses the Griess test, named after Peter Griess (1829-58), a brewing & synthetic dye chemist. These two sciences may sound distant, but for Mr. Griess, this was his bread and butter.

After developing the diazotization reaction used for creating azo dyes in 1858, Griess began two simultaneous careers. He had a contract with BASF in Germany (photo circa 1865) patenting new dyes for manufacturing. The second was for Samuel Allsop & Sons Brewing in England.

His work at Allsop was secretive, but it can be assumed he was using his azo dyes to identify microorganisms in beer. Griess helped Allsop rise to the forefront of brewing science at the time. Yet another instance of better beer pushing major advances in science.
The products of Griess' work are vast, as azo dyes proved to be extremely useful in many areas. The most familiar to us is in the identification of nitrite in water samples, often referred to as the Griess test.

In this method, nitrite levels are determined through formation of a reddish purple azo dye produced at pH 2.0 to 2.5 by coupling diazotized sulfanilamide with N-(1-naphthyl)-ethlyenediamine dihydrochloride (NEDD).

To learn more about the fascinating impact of Peter Griess' research, check out this article from The Royal Society.
UPCOMING EVENTS

SEAL Webinar Troubleshooting Series: Chloride, Sulfate & Total Alkalinity
Tuesday, Nov. 9, 2021 9:00 am CDT

Thursday, Nov. 18, 2021 3:00 pm CDT
MONTHLY TROUBLESHOOTING TIP
If upgrading or transferring to a new computer, AACE software requires a default printer to be set-up on the computer. If not, you will find that the sampler moves while in charting, but will not during a run. A print to pdf "printer" is acceptable. This feature is in place to aid with automatic printout of reports, charting, or export functions.
SEAL Book Club!
The book for November is And Then There Were None by Agatha Christie.
If you have any recommendations for books, please send us an email.
Tynemouth Seal Hospital pup tagging marks milestone in recovery

Volunteer medics at a seal hospital on Tyneside have tagged four pups in what has been described as a milestone in their recovery.

Tynemouth Seal Hospital is currently caring for four common seal pups which were rescued in the summer.

All were severely underweight and some had other health problems, but have now piled on the pounds.

Once they have reached a target weight of 30kg (66lbs) they will be released back into the North Sea.

The colour, material and code number of seal tags indicate where the animal was rehabilitated and its medical history.

It means that if they are spotted in the wild, or found dead, they can be identified and the information is entered onto a database used by environmental organisations around Europe.
SOFTWARE FEATURE: Parts List Available
In the AACE software, a pdf is available which lists various parts. In this pdf, there are pictures of the part along with the corresponding part number. For segmented flow instruments, glassware is important and these pictures allow for the correct part to be ordered.

To find the parts list, select Tools then Service Parts List. Next select the instrument you are running. Then navigate through the different sections using the table of content links. Following this, you can then call to get a quote or receive a quote through the Buy Parts section on the SEAL Analytical website.
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Technical Support
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