【摘要】 <正> Takagi等人首先合成了生色冠醚—4′-苦胺基苯并-15-冠-5,经三氯甲烷萃取后可测定海水中的钾,经我们改进后可用于岩石和土壤中测定钾。Sumiyoshi等人用苯萃取18-冠-6-钾和溴甲酚绿用于血浆中钾的测定。但对测定的有关条件缺乏具更多还原

【Abstract】 in this paper, the conditions for the determination of potassium with 18-crown-6-bromocresol green by spectrophotometric method have been studied in detail. The LiOH-H2C2O< solution (pH3.7) was chosen as a masking reagent, then the selectivity of this method was increased. This procedure can be applied directly in the concentration range of 0-30 ug of potassium in water samples containing no ammonium ion.更多还原