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Download Turbidity Field Measurement Standard Operating Procedure
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Options/Set Up Regulatory Method Acronyms Definitions Notes NTU Nephelometric Turbidity Units Incandescent white light between 400 and 600 nm, 90° detection, 2020we FNU Formazin Nephelometric Units IR LED (usually) 860 ISO 7027 nm, bandwidth less than 60 nm, 90° detection, 2020wi AU Attenuation Units Incandescent white light between 400 and 600 nm, 180° detection, 2020we FAU Formazin Attenuation Units IR LED (usually) 860 ISO 7027 nm, bandwidth less than 60 nm, 180° detection, 2020wi ASBC American Society of Brewing Chemists 2020we/wi Not applicable EBC European Brewery Convention 2020we/wi Not applicable EPA 180.1 Not applicable The 2020we and 2020wi each use two turbidity units. The 2020we reports the result as NTU when the 90° detector is used and AU when the 180° detector is used. The 2020wi reports the result as FNU when the 90° detector is used and FAU when the 180° detector is used. TAKING TURBIDITY WATER SAMPLES Clean plastic or glass containers may be used for turbidity samples. Ideally, samples should be tested soon after collection and at the same temperature as when collected. 16
