{"id":4189,"date":"2014-08-21T10:00:21","date_gmt":"2014-08-21T15:00:21","guid":{"rendered":"https:\/\/www.coleparmer.com\/blog\/?p=4189"},"modified":"2019-09-24T11:20:30","modified_gmt":"2019-09-24T17:20:30","slug":"three-dissolved-oxygen-technologies-which-works-best-for-you-part-1","status":"publish","type":"post","link":"https:\/\/www.coleparmer.com\/blog\/three-dissolved-oxygen-technologies-which-works-best-for-you-part-1\/","title":{"rendered":"Three Dissolved Oxygen Technologies: Which Works Best for You? (Part 1)"},"content":{"rendered":"<p><a href=\"https:\/\/www.coleparmer.com\/Category\/Dissolved_Oxygen_Benchtop_Meters\/3374?SearchTerm=Dissolved+Oxygen+Benchtop+Meters?referred_id=5618\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">Dissolved oxygen<\/a> is a critical measurement for wastewater treatment. An operator must ensure proper aeration for the aerobic bacteria in the tank to break down organic suspended solids. Three technologies for measuring dissolved oxygen are employed in the market today: Polarographic, Galvanic, and Optical.<\/p>\n<p><strong>Polarographic<a href=\"https:\/\/www.coleparmer.com\/Category\/Dissolved_Oxygen_Benchtop_Meters\/3374?SearchTerm=Dissolved+Oxygen+Benchtop+Meters?referred_id=5618\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-4192\" src=\"https:\/\/www.coleparmer.com\/blog\/wp-content\/uploads\/2014\/08\/polargraphicimage_do_35415_00_left.gif\" alt=\"PolargraphicImage_DO_35415_00_left\" width=\"183\" height=\"185\"><\/a><\/strong><\/p>\n<p>Clark-cell, polarographic technology supplies constant electrical voltage across the anode and cathode. As oxygen is reduced, the current supplied to the cathode is increased. The amount of electricity required to reduce the oxygen at the cathode is equivalent to the dissolved oxygen present.<\/p>\n<p>This technology was developed in 1956 and is familiar to most operators. The challenges of polarographic technology include necessary warm-up time, membrane replacement, and the potential of electrolyte solutions degrading.<\/p>\n<p><strong>Galvanic<\/strong><\/p>\n<p>Galvanic technology, developed in 1964, consists of an anode and cathode in electrolyte solution covered with an oxygen-permeable membrane. As oxygen permeates the membrane, the cathode reduces the oxygen, creating a potential that is equal to the amount of oxygen in the system.<\/p>\n<p>This method offers the advantages of eliminating warm-up times, as the self-polarized probe is ready to read. However, galvanic technology still struggles with membranes and electrolyte solutions. Interference occurs with the presence of any chemical that produces an electrical charge.<\/p>\n<p><em>Look for part II to read about optical <\/em><a href=\"https:\/\/www.coleparmer.com\/Category\/Dissolved_Oxygen_Benchtop_Meters\/3374?SearchTerm=Dissolved+Oxygen+Benchtop+Meters?referred_id=5618\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"><em>dissolved oxygen technology<\/em><\/a><em>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dissolved oxygen is a critical measurement for wastewater treatment. An operator must ensure proper aeration for the aerobic bacteria in the tank to break down organic suspended solids. Three technologies for measuring dissolved oxygen are&#8230;<\/p>\n","protected":false},"author":20,"featured_media":4192,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[445,447],"class_list":["post-4189","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-water-sampling","tag-dissolved-oxygen","tag-dissolved-oxygen-meters"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Three Dissolved Oxygen Technologies: Which Works Best for You? (Part 1) | from Cole-Parmer Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.coleparmer.de\/blog\/three-dissolved-oxygen-technologies-which-works-best-for-you-part-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Three Dissolved Oxygen Technologies: Which Works Best for You? (Part 1) | from Cole-Parmer Blog\" \/>\n<meta property=\"og:description\" content=\"Dissolved oxygen is a critical measurement for wastewater treatment. An operator must ensure proper aeration for the aerobic bacteria in the tank to break down organic suspended solids. Three technologies for measuring dissolved oxygen are...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.coleparmer.de\/blog\/three-dissolved-oxygen-technologies-which-works-best-for-you-part-1\/\" \/>\n<meta property=\"og:site_name\" content=\"Cole-Parmer Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/antylia\" \/>\n<meta property=\"article:published_time\" content=\"2014-08-21T15:00:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-09-24T17:20:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i0.wp.com\/www.coleparmer.de\/blog\/wp-content\/uploads\/2014\/08\/polargraphicimage_do_35415_00_left.gif?fit=346%2C350&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"346\" \/>\n\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/gif\" \/>\n<meta name=\"author\" content=\"Cole-Parmer Blog Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@antylia\" \/>\n<meta name=\"twitter:site\" content=\"@antylia\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Cole-Parmer Blog Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Three Dissolved Oxygen Technologies: Which Works Best for You? (Part 1) | from Cole-Parmer Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.coleparmer.de\/blog\/three-dissolved-oxygen-technologies-which-works-best-for-you-part-1\/","og_locale":"en_US","og_type":"article","og_title":"Three Dissolved Oxygen Technologies: Which Works Best for You? (Part 1) | from Cole-Parmer Blog","og_description":"Dissolved oxygen is a critical measurement for wastewater treatment. An operator must ensure proper aeration for the aerobic bacteria in the tank to break down organic suspended solids. 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