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9 PrecIsIon and Accuracy 9 1 Twenty-four analysts m sIxteen laboratones analyzed natural water samples contammg exact Increments of an ammomum salt, wIth the followmg results 8 3 PotentlOmetnc 500 mg/1NH3- N=- xA D where A = mg NH3-N/1 from electrode method standard curve D = ml of ongmal sample taken Increment as NItrogen, Ammoma mg N/hter 021 026 171 0244 +046 +001 192 0279 -201 -004 PreCISiOn as Standard DevIatIOn mgN/hter Accuracy as BIas, Bias, % mg N/hter 0122 0070 -554 -001 -1812 -005 (FWPCA Method Study 2, Nutnent Analyses) BIblIography 1 Standard Methods for the ExammatlOn of Water and Wastewater, 14th EdltlOn, p 410, Method 418A and 418B (1975) 2 Annual Book of ASTM Standards, Part 31, "Water", Standard D1426-74, Method A, p 237 (1976) 3502-5PDF Image | Methods for Chemical Analysis of Water and Wastes
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