Problems encountered in ammonia nitrogen testing
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1. When plotting the standard curve, should the absorbance at each concentration be subtracted from the zero-background value or from the reagent background value? 2. When testing samples, is the blank test simply a zero-degree blank? Do I need to measure again every time? Thank you(*°?°)=3
Zero should be the reagent blank subtraction. Of course, a blank test must be performed every time a standard curve is made; that goes without saying. One must be meticulous when performing laboratory tests.