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ISO 7890-3:1988 Water quality - Determination of nitrate - Part 3 : Spectrometric method using sulfosalicylic acid
standard by International Organization for Standardization, 12/01/1988
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Procedure given is applicable to raw and potable water. The range covers a nitrat nitrogen concentration up to 0,2 mg/l using the maximum test portion of 25 ml. Using cells of path length 40 mm and a 25 ml test portion the limit of detection lies within the range 0,003 to 0,013 mg/l.