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- W2325339904 abstract "A microdetermination of nitrate nitrogen in the tea leaf was investigated colorimetrically and the following method was established.Treat the hot water extract of tea with basic lead acetate and ammonium hydroxide (pH 9). After removed the excess Pb with Na2HPO4, add Amberlite IR-120, stir occationally for about 1-2 hrs., and filter the solution into a 50-ml. erlenmyer flask. Add 5 ml. of about 2 N ammonium hydroxide, 0.5ml. of 1 % manganous chloride, and 0.2 g. of zinc dust successively. Stopper the flask and agitate for about 20 minutes on a magnetic stirrer. Filter the solution, acidify the filtrate (pH 1-3) with concentrated hydrochloric acid dropwise and develop the color with 0.3 g.of Griess-Romijn reagent on a water bath (35°C) for 10 minutes and make to 50 ml. After standing an hour, measure the absorbancy of the colored solution at 522 mμ with a spectrophotometer.The recovery of added nitrate nitrogen and the coefficient of variation of this determination (tea infusion) were 98.4% and 4.03% respectively." @default.
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- W2325339904 date "1962-11-15" @default.
- W2325339904 modified "2023-09-25" @default.
- W2325339904 title "A Microdetermination of Nitrate Nitrogen in the Tea Leaf" @default.
- W2325339904 doi "https://doi.org/10.5979/cha.1962.109" @default.
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