{"id":7867,"date":"2025-04-13T11:57:14","date_gmt":"2025-04-13T08:31:30","guid":{"rendered":"http:\/\/www.azarasaco.com\/?p=7867"},"modified":"2025-05-24T13:50:45","modified_gmt":"2025-05-24T10:20:45","slug":"free-residual-chlorine","status":"publish","type":"post","link":"http:\/\/www.azarasaco.com\/en\/1404\/01\/24\/free-residual-chlorine\/","title":{"rendered":"Free residual chlorine"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"7867\" class=\"elementor elementor-7867\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7360c02c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7360c02c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1c29215c\" data-id=\"1c29215c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-122b2e7a elementor-widget elementor-widget-text-editor\" data-id=\"122b2e7a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h4><span style=\"color: #003366;\"><strong>Free residual chlorine<\/strong><\/span><\/h4><p>The sum of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Hypochlorous_acid\">hypochlorous acid (HClO)<\/a> and hypochlorite ion (OCl<sup>&#8211;<\/sup>) present in <a href=\"http:\/\/www.azarasaco.com\/en\/1404\/01\/23\/the-importance-of-water-analysis\/\">water<\/a> is called residual free chlorine with the chemical symbol Cl<sub>2<\/sub> and can kill microbes. Care must be taken in sampling and sample storage because chlorine is not stable in aqueous solution. The chlorine content of samples or solutions, especially weak solutions, decreases rapidly. Exposure to sunlight or other strong light or stimulation accelerates the reduction of chlorine. Therefore, we begin measuring chlorine immediately after sampling, avoiding excessive light and agitation. We should not store samples that we analyze for chlorine.<\/p><h5><span style=\"color: #003366;\"><strong>Advantages of <\/strong><\/span><span style=\"color: #003366;\"><strong>chlorination<\/strong><\/span><\/h5><p>We use chlorination of water sources and contaminated waters to destroy or inactivate disease-causing microorganisms, disinfect drinking water, and keep swimming pools clean and sanitary. We also use it in drinking water treatment to improve the overall quality of water by reacting chlorine with ammonia, iron, manganese, sulfide, and some organic materials. As a result, its presence is an indication of the effectiveness of the disinfection system and the ability of the water to combat microbial contamination.<\/p><h5><span style=\"color: #003366;\"><strong>Disadvantages of chlorination<\/strong><\/span><\/h5><p>Chlorination can cause adverse effects. The taste and odor characteristics of phenols and other organic compounds in the water source may be enhanced. Carcinogenic chlorinated organic compounds, such as chloroform, may be formed. Combined chlorine from chlorination of ammonia or amine-containing waters has adverse effects on some aquatic life. To achieve the primary purpose of chlorination and minimize any adverse effects, it is essential to use appropriate testing methods.<\/p><h5><span style=\"color: #003366;\"><strong>Chlorine measurement method<\/strong><\/span><\/h5><p>1- We determine the amount of free chlorine using accurate kits.<\/p><p>2- We determine the amount of chlorine using the titration method and laboratory reagents and equipment.<\/p><p>3- With electronic devices: These devices use electrochemical sensors to digitally display the concentration of free chlorine in milligrams per liter.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4f4739a elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4f4739a\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container 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aria-hidden=\"true\"><\/i>\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-inner-column elementor-element elementor-element-00c046c\" data-id=\"00c046c\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap\">\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<div class=\"elementor-element elementor-element-ad1f62a elementor-widget elementor-widget-spacer\" data-id=\"ad1f62a\" data-element_type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Free residual chlorine The sum of hypochlorous acid (HClO) and hypochlorite ion (OCl&#8211;) present in water is called residual free chlorine with the chemical symbol Cl2 and can kill microbes. Care must be taken in sampling and sample storage because chlorine is not stable in aqueous solution. The chlorine content of samples or solutions, especially [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2353,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,437],"tags":[493,509,383,511,481,485,513,489],"class_list":["post-7867","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-last-article-news-en","category-water-lab","tag-articles","tag-chloride","tag-dpd-en","tag-free-residual-chlorine","tag-water","tag-water-analysis","tag-water-disinfection","tag-water-laboratory"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Free residual chlorine - Azarasa company<\/title>\n<meta name=\"description\" content=\"Free residual chlorine is the sum of hypochlorous acid and hypochlorite ions present in water. 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