{"id":1308,"date":"2015-08-12T19:38:38","date_gmt":"2015-08-12T19:38:38","guid":{"rendered":"https:\/\/www.ott.com\/blog\/?p=188"},"modified":"2021-01-10T15:20:18","modified_gmt":"2021-01-10T14:20:18","slug":"turbidity-measurement-why-does-it-matter","status":"publish","type":"post","link":"https:\/\/blog.otthydromet.com\/en\/turbidity-measurement-why-does-it-matter\/","title":{"rendered":"Turbidity Measurement: Why Does it Matter?"},"content":{"rendered":"<p>Turbidity is one of the most talked about parameters in environmental <a href=\"https:\/\/www.ott.com\/en-us\/products\/water-quality-1\/\" target=\"_blank\" rel=\"noopener noreferrer\">water quality monitoring<\/a>, yet the details around turbidity measurement are not always known or fully understood. Use our guide below for a better understand of all things turbidity!<\/p>\n<p><strong>Turbidity Overview<\/strong><\/p>\n<p>The amount of dispersed suspended solids in natural water bodies is an important indicator of water quality. These solids (such as silt, clay, algae, and organic matter) obstruct the transmittance of light through water and create a qualitative characteristic known as turbidity. Turbidity is often closely correlated to climatological or surface water conditions, and therefore indicates changes in environmental conditions of lakes, rivers and streams. For example, high levels of suspended sediment can interfere with photosynthesis by blocking light from reaching aquatic plants. This not only damages vegetation but also results in reduced levels of dissolved oxygen because of the reduction in photosynthesis. Moreover, waters with high levels of suspended solids absorb more light, which can cause an increase in water temperature, creating even lower dissolved oxygen.\u00a0 This stresses aerobic aquatic organisms and could ultimately lead to fish kills.<\/p>\n<p><strong>Turbidity as a Valuable Surrogate<\/strong><\/p>\n<p>The Clean Water Act requires States to establish total maximum daily loads (TMDLs) of various pollutants to meet water quality standards. The ability to continuously measure water parameters associated with impairments is often limited by technical and financial constraints. Turbidity, however, can be effective as a surrogate measurement because it can be measured in-stream on a continuous basis and it is strongly correlated with sediment, nutrients, and bacteria concentrations.\u00a0 Below is a list of turbidity as a surrogate measurement for many environmental influencers:<\/p>\n<ul>\n<li>Monitoring the impact of humans on natural water bodies.<\/li>\n<li>Monitoring pathogens in water, such as E.coli in storm water runoff from cattle pastures.<\/li>\n<li>Monitoring sediments to track erosion and landscape change.<\/li>\n<li>Monitoring natural streams below mining and dredging operations<\/li>\n<li>Measuring total phosphorous in water is very difficult, but an increase in phosphate or phosphorous typically correlates to an increase in turbidity levels.<\/li>\n<\/ul>\n<figure id=\"attachment_190\" aria-describedby=\"caption-attachment-190\" style=\"width: 1007px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/blogottprod.wpengine.com\/wp-content\/uploads\/2015\/08\/HL-Surveyer_Low-Res.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-190\" src=\"http:\/\/blogottprod.wpengine.com\/wp-content\/uploads\/2015\/08\/HL-Surveyer_Low-Res.jpg\" alt=\"Turbidity measurement with the Hydrolab HL4 multiparameter sonde.\" width=\"1007\" height=\"768\" \/><\/a><figcaption id=\"caption-attachment-190\" class=\"wp-caption-text\">Turbidity measurement with the Hydrolab HL4 multiparameter sonde.<\/figcaption><\/figure>\n<p><!--more--><\/p>\n<p><strong>Turbidity Measurement Technologies:<\/strong><\/p>\n<p>It\u2019s important to remember that turbidity is not a measure of the quantity of suspended solids in a sample but, instead, an aggregate measure of the combined scattering effect of the water sample\u2019s suspended particles on an incident light source. All turbidity measurements detect the amount of light either transmitted through or scattered by the particles in a sample of water.<\/p>\n<p>Over the past several decades, instrument technology has advanced dramatically and many turbidity measurement techniques have resulted to address problems associated with earlier turbidity measurement techniques. Different technological approaches (often using different light sources and detector designs) have been used to compensate for or minimize measurement errors attributed to color, bubbles, stray light, absorption, and path length.<\/p>\n<p>For a in-depth analysis\u00a0of turbidity measurement methods, please\u00a0view our <a href=\"https:\/\/www.ott.com\/en-us\/products\/download\/turbidity-white-paper\/\" target=\"_blank\" rel=\"noopener noreferrer\">Turbidity Measurement White Paper<\/a>. For information on turbidity measurement, visit the <a href=\"https:\/\/www.ott.com\/en-us\/products\/sensors-1\/turbidity-sensor\/\" target=\"_blank\" rel=\"noopener noreferrer\">Hydrolab turbidity sensor page<\/a> for in-situ measurement methods or the <a href=\"http:\/\/www.hach.com\/turbidity-meter\/family?productCategoryId=35547372709\" target=\"_blank\" rel=\"noopener noreferrer\">Hach turbidity page<\/a> for benchtop solutions.<\/p>\n<p><strong>Variability Based on Measurement Method<\/strong><\/p>\n<p>It is normal for different turbidity measurement technologies to deliver different results on the same sample. This is because natural suspended solids &#8211; whether algae, silt, organic material, etc. &#8211; have wildly different and practically unpredictable characteristics, such as the way they absorb and reflect light. From technology to technology, differences in the combination of incident light source, detection angle, and number of detectors, together with the natural variation in sample optical characteristics, lead to different measurement results. Because of this potential for variability, it is important to also provide information on the type of technology used to collect a given set of data.<\/p>\n<p>Readings are generally reported in Nephelometric Turbidity Units, or NTUs. NTU has been the traditional reporting unit for turbidity and is still recognized by some as the \u201cuniversal\u201d unit of measure, regardless of the technology used.\u00a0 However, because of the potential to generate data with a high degree of variability when different technologies are used, the American Society for the Testing of Materials (ASTM) has revised its turbidity measurement methods to incorporate a unit reporting protocol that provides traceability to the type of technology used.<\/p>\n<p><strong>Best Practices When Measuring Turbidity <\/strong><\/p>\n<p>Best practices are essential for reliable data collection and use. When deciding on which technologies to use for a specific application, it is important to adhere to the following guidelines:<\/p>\n<ol>\n<li>Select the proper monitoring site: The site should produce a homogenous sample and be easily accessible.<\/li>\n<li>Know the environmental limits of the instrument for the specific sample location. This includes temperature and precipitation conditions.<\/li>\n<li>Select the proper instrument based on light source, detection angle, and sensitivity.<\/li>\n<li>Calibrate the instrument according to the manufacturer recommendations.<\/li>\n<li>Verify the calibration using same or similar technology.<\/li>\n<li>Maintain the instrument<\/li>\n<\/ol>\n<p>For more information on turbidity measurement, please read our <a href=\"https:\/\/www.ott.com\/en-us\/products\/download\/turbidity-white-paper\/\" target=\"_blank\" rel=\"noopener noreferrer\">Turbidity White Paper<\/a>, view our Turbidity Webinar below, or contact OTT Hydromet Technical Support at <a href=\"mailto:techsupport@otthydromet.com\" target=\"_blank\" rel=\"noopener noreferrer\">techsupport@otthydromet.com<\/a>.<\/p>\n<p><iframe title=\"Turbidity Measurement Webinar\" width=\"800\" height=\"600\" src=\"https:\/\/www.youtube.com\/embed\/dDeJQ2GI0ao?start=46&#038;feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Turbidity is one of the most talked about parameters in environmental water quality monitoring, yet the details around turbidity measurement are not always known or fully understood. Use our guide below for a better understand of all things turbidity! Turbidity Overview The amount of dispersed suspended solids in natural water bodies is an important indicator [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-1308","post","type-post","status-publish","format-standard","hentry","category-hydrology"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Turbidity Measurement: Why Does it Matter? - OTT 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:\/\/blog.otthydromet.com\/en\/turbidity-measurement-why-does-it-matter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Turbidity Measurement: Why Does it Matter? - OTT Blog\" \/>\n<meta property=\"og:description\" content=\"Turbidity is one of the most talked about parameters in environmental water quality monitoring, yet the details around turbidity measurement are not always known or fully understood. 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