Cheap cod reagent vials with round bottom

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3‐N), total phosphorus (TP), and chemical oxygen demand (COD) in filtered water were measured according to the standard methods of Chinese Environmental Quality Standards. Ammonia nitrogen concentration was measured by the Nessler's reagent spec-trophotometric method (HJ 535‐2009). Nitrite nitrogen concentration

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KOtBu (49.2 mg, 0.44 mmol, 1.6 equiv) was added, and the reaction vial was sealed under nitrogen with a Teflon cap. The vial was then taken outside of the glove box, and degassed 2-propanol (2.7 mL) was added. The reaction was then stirred at RT for 10 min and transferred to an oil bath at 70 °C.

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Dec 29, 2015 · It uses reagent such as N,N,N′,N′- tetramethyl-p-phenylenediamine (TMPD) or N,N-dim ethyl-p- phenylenediamine (DMPD), which is also a redox indicator. The reagent is a dark-blue to maroon colour when oxidized, and colourless when reduced. e.g: Pseudomonaus aeruginosa Catalytic test Some bacteria have catalyzed enzyme.