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Measurement of nutrients <br />Collimator Wavelength Selector Detector <br />(Lens) (Slit) (Photocell) <br />Digital Display <br />Light source Monochromator Sample or Meter <br />(Pr ism or Grating) Solution <br />(in Cuvette) <br />WET CHEMISTRY MEASUREMENT OF <br />NITRITE + NITRATE <br />543 nm <br />1.6 <br />1.4 <br />1.2 <br />u 1.0 <br />r 0.8 <br />m <br />a <br />N 0.6 <br />is <br />d 0.4 <br />0.2 <br />00 <br />1.8 <br />14 <br />1.2 <br />1.0 <br />m <br />08 c <br />m <br />b <br />06 <br />m <br />OA d <br />0.2 <br />0.0 <br />3W = 400 +50 6W $50 600 SW 0.00 0.05 0.10 0.15 0.20 0.25 <br />Wavelength (nm) Nitnte Conc. (mg/L as N <br />3/4/2015 <br />in <br />