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- W4321794755 abstract "Extract AOAC Official Method 935.02Potassium in Fertilizers: Lindo-Gladding Method First Action 1935 Final Action Reagents ... Preparation of Solution ... Determination ... To convert K2PtCl6 to KCl, use factor 0.3068; to K2SO4, 0.3586; to K2O, 0.1938. References: ... AOAC Official Method 949.01Potassium in Fertilizers: Wet-Digestion Method First Action 1949 Final Action Preparation of Solution Proceed as in 935.02 (see 2.5.01). Determination Place 50 mL aliquot solution (or 25 mL aliquot and 25 mL H2O, if sample contains >20% K2O) in 500 mL Kjeldahl flask. Add 10 mL HNO3 and silica granule (ca 1 cm long, previously weighed along with prepared Gooch or medium porosity fritted Pyrex crucible). Boil 2 min and add 10 mL HCl. Boil down to ca 25 mL, and add 5 mL HCl and excess Pt solution. Boil down to 10–15 mL, rotating flask occasionally, and then add 5 mL HCl. Reduce heat and boil down to 3–5 mL (depending on amount of precipitate), rotating flask frequently near end of evaporation. Remove flask from heat and swirl to dissolve any sol. residue on walls. Cool, and immediately add 25 mL alcohol to wash down neck of flask. Chill under tap, swirl, and let stand at least 5 min. Decant into weighed crucible and transfer precipitate and granule with aid of stream of alcohol. Wash 5–6 times with 10 mL portions NH4Cl solution, 935.02 (see 2.5.01), to remove Mg and Na salts from precipitate. Wash again thoroughly with alcohol and dry precipitate 30 min at 100°C. Weigh and subtract weight of crucible plus silica granule." @default.
- W4321794755 created "2023-02-25" @default.
- W4321794755 date "2023-01-04" @default.
- W4321794755 modified "2023-10-16" @default.
- W4321794755 title "Potassium" @default.
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- W4321794755 doi "https://doi.org/10.1093/9780197610145.003.024" @default.
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