{"id":3354,"date":"2013-11-08T10:00:06","date_gmt":"2013-11-08T16:00:06","guid":{"rendered":"https:\/\/www.coleparmer.com\/blog\/?p=3354"},"modified":"2019-09-24T11:39:31","modified_gmt":"2019-09-24T17:39:31","slug":"laboratory-supplies-ph-electrodes-basics","status":"publish","type":"post","link":"https:\/\/www.coleparmer.com\/blog\/laboratory-supplies-ph-electrodes-basics\/","title":{"rendered":"Laboratory Supplies: pH Electrodes Basics"},"content":{"rendered":"<p>pH electrodes are a basic laboratory supply for use in <a href=\"https:\/\/www.coleparmer.com\/Category\/pH_Meters_Ion_Meters_and_ISFET_Meters\/3415?referred_id=5618\" target=\"_blank\" rel=\"nofollow noopener noreferrer\">pH meters<\/a>. Refer to the descriptions below to order or replace your electrodes.<\/p>\n<p><b>The Electrode Pair<a href=\"https:\/\/www.coleparmer.com\/blog\/wp-content\/uploads\/2013\/11\/oakton-pc2700-meter-with-ph-electrode.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-3357\" alt=\"Oakton-PC2700-Meter-with-pH-electrode\" src=\"https:\/\/www.coleparmer.com\/blog\/wp-content\/uploads\/2013\/11\/oakton-pc2700-meter-with-ph-electrode.jpg?w=169\" width=\"169\" height=\"300\"><\/a><\/b><\/p>\n<p>Sensing half-cell electrodes are the measuring portion of the electrode system and contain the pH-sensitive membrane. Reference half-cells electrodes provide the reference potential needed for pH measurement. Most of the electrodes in our catalog are combination electrodes that house both half-cells in a single probe.<\/p>\n<p><b>Bulb Material and Design<\/b><\/p>\n<p>The bulb is constructed of different types of glass, each with different properties.<\/p>\n<p>General-purpose glass: various pH ranges, temperatures to 212\u00baF (100\u00baC) prevents Na+ error.<\/p>\n<p>Blue glass: pH 0 to 14, temperatures to 230\u00baF (110\u00baC).<\/p>\n<p>The bulb shape can be modified to provide a semi-dome for increased ruggedness, a spear tip for penetration applications, or even a flat surface.<\/p>\n<p><b>Junction Types<\/b><\/p>\n<p>Junctions can be categorized into three distinct types. Sleeve and annular (open) junctions are high-flow, and best in dirty and viscous samples. Ceramic and capillary junctions are medium flow, and ideal for everyday samples and most applications. Wick and fiber junctions are low-flow, and best for use with clean samples.<\/p>\n<p><b>Glass vs Epoxy Body<\/b><\/p>\n<p>Epoxy-body electrodes are impact resistant and are ideal for rough handling but should not be used at higher temperatures or for solvents. (Note: Even though the body of an epoxy electrode is plastic, the bulb will still be glass.) Glass-body electrodes withstand high temperatures, corrosive materials, and solvents.<\/p>\n<p><b>Sealed vs Refillable<\/b><\/p>\n<p>Sealed (also known as gel-filled) electrodes are easier to maintain than refillable liquid filled electrodes. However, they must be replaced when the fill material level is low. Refillable electrodes are long-lasting and provide a faster response.<\/p>\n<p><b>Single- vs Double-junction<\/b><\/p>\n<p>In combination electrodes, the reference junction allows H+ ions to pass freely between reference and sensing half-cells to complete the electrical circuit. A single-junction design has one place where the H+ ions pass between half-cells. The junction is located so that contaminants in your sample can also pass into the reference chamber, leaving the potential for electrode failure due to reference contamination. A double-junction design restricts the reference behind a second junction; making it twice as hard for reference contamination to occur.<\/p>\n<p><i>View all <\/i><a href=\"https:\/\/www.coleparmer.com\/Category\/pH_Ion_Laboratory_Electrodes\/3528?referred_id=5618\" target=\"_blank\" rel=\"nofollow noopener noreferrer\"><i>pH electrodes<\/i><\/a><i>.<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"<p>pH electrodes are a basic laboratory supply for use in pH meters. Refer to the descriptions below to order or replace your electrodes. The Electrode Pair Sensing half-cell electrodes are the measuring portion of the&#8230;<\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[942],"class_list":["post-3354","post","type-post","status-publish","format-standard","hentry","category-ph-2","tag-laboratory-supplies"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Laboratory Supplies: pH Electrodes Basics | 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\/laboratory-supplies-ph-electrodes-basics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Laboratory Supplies: pH Electrodes Basics | from Cole-Parmer Blog\" \/>\n<meta property=\"og:description\" content=\"pH electrodes are a basic laboratory supply for use in pH meters. 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