usp中緩沖溶液和標準溶液及詳細配制方法-展示頁
2024-09-05 13:17本頁面
【正文】 s may be obtained from mercial sources in convenient prepackagedform. Such preparations are available for the entire working range inpharmaceutical analysis, but are not remended for pH meterstandardization (see pH 791.The required reagents are described in the section, Reagents.Previously dry the crystalline reagents, except the boric acid, at 110degrees to 120 degrees for 1 hour.NOTE Where water is specified for solution or dilution of testsubstances in pH determinations, use carbon dioxidefree water.Store the prepared solutions in chemically resistant, tight containerssuch as Type I glass bottles. Use the solutions within 3 months.Standard buffer solutions for various ranges between pH and may be prepared by appropriate binations of M solutions describedherein, used in the proportions shown in the acpanying table. Thevolumes shown in the table are for 200 mL of buffer solution.1. Hydrochloric Acid, M, and Sodium Hydroxide, M Prepareand standardize as directed under Volumetric Solutions.2. Potassium Biphthalate, M Dissolve g of potassiumbiph
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