Octet comparator uses the modified A.P.H.A. cadmium reduction method for analysis of nitrate nitrogen covering the comparator range of 0.25 to 10.0 ppm (values 0.25, 0.5, 1.0, 2.0, 4.0, 6.0, 8.0, 10.0 ppm). Two reagents, makes 40 tests, 14 minutes per test.
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