The ideal test solution for an ORP electrode is a commercially-produced standard. Many companies sell ORP standards: Hach, Cole Parmer, and Hanna are three examples.
\nYou can also prepare you own test solution. Here are the recipes for two:<\/p>\n
Light’s Solution: prepare a 0.1 M solution of both ferric ammonium sulfate (NH\u2084Fe(SO\u2084)\u2082\u00b712H\u2082O, also known as ammonium iron(III) sulfate) and ferrous ammonium sulfate ((NH\u2084)\u2082Fe(SO\u2084)\u2082\u00b76H\u2082O, also known as ammonium iron(II) sulfate) in 1.0 M sulfuric acid. This solution has a potential of 470 – 480 mV.<\/p>\n
ZoBell’s Solution:
\n1.4080 g K\u2084Fe(CN)\u2086\u00b73H\u20820 (Potassium ferrocyanide)
\n1.0975 g K\u2083Fe(CN)\u2086 (Potassium ferricyanide)
\n7.4557 g KCl (Potassium chloride)
\nDissolve these chemicals in deionized water and dilute the solution to 1.00 L.
\nThis solution has a potential of 225-235 mV.<\/p>\n
Connect your ORP sensor to your platform. Immerse the tip of the ORP sensor in a test standard solution. Allow the ORP sensor about a minute to warm up, and check the reading.<\/p>\n
You can also use Light’s Solution and ZoBell’s Solution to calibrate the ORP sensor, but commercial solutions will be more accurate.<\/p>","protected":false},"excerpt":{"rendered":"
The ideal test solution for an ORP electrode is a commercially-produced standard. Many companies sell ORP standards: Hach, Cole Parmer, and Hanna are three examples….<\/p>\n","protected":false},"author":11015,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[647,1897,4101],"class_list":["post-2467","post","type-post","status-publish","format-standard","hentry","tag-electrode","tag-orp-bta","tag-oxidation-reduction-electrode"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/11015"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=2467"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/2467\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=2467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=2467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=2467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}