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potassium dihyrogenorthophosphate solution (0,1 m):
is-soluzzjoni tad-diiroġenortofosfat tal-potassju (0,1 m):
最后更新： 2014-11-21
使用频率： 3
质量：
this method describes the determination of quinine. it may be used to determine the maximum permitted concentration of 0,5 % (m/m) in shampoos and 0,2 % in hair lotions. definition // the quinine content determined by this method is expressed as a percentage by mass (% m/m) of the product. principle // after appropriate treatment of the product to be analyzed the determination is done by high-performance liquid chromatography (hplc). reagents // all reagents should be of analytical purity and suitable for hplc. acetonitrile. potassium dihydrogenorthophosphate (kh2po4). orthophosphoric acid (85 %; d 20 4 = 1,7). tetramethylaminium bromide. quinine, anhydrous. methanol. orthophosphoric acid solution (0,1 m): weigh 11,53 g of orthophosphoric acid (4.3) and dissolve in 1 000 nl of water in a graduated flask. potassium dihyrogenorthophosphate solution (0,1 m): weigh 13,6 g of potassium dihydrogenorthophosphate (4.2) and dissolve in 1 000 ml of water in a graduated flask. tetramethylammonium bromide solution :
l-aċidu idrokloriku (1 m). 3.
最后更新： 2014-11-21
使用频率： 3
质量：
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