【摘要】 比较了高氯酸、硝酸-氢氧化钾和超纯水3种基质对香樟叶片中氟化物浸提效果以及氟离子选择电极法定量方式之间的差异,同时尝试了离子色谱法。结果表明,间歇超声45 min浸提满足测定要求,标准加入法定量结果更可信。高氯酸基质曲线在不同日期制备的曲线重合度、斜率转化系数和日间偏差不如其他2种基质,但操作简单,浸提效果好,可通过测定前调节p H值和添加总离子强度调节剂改善;硝酸-氢氧化钾浸提效果与高氯酸的相当或更好,精密度好,但操作步骤多;超纯水浸提平均效果是其他2种的80%,叶片氟化物含量较低时与酸浸提效果相近;氟离子选择电极法与离子色谱法对叶片氟化物测定结果差异甚大,原因待查。更多还原

【Abstract】 Three different extraction methods( perchloric acid,nitric acid-potassium hydroxide and ultrapure water) were compared in determination of fluoride content in camphor leaves. In addition,instrument analysis methods including ion-selective electrode and ion chromatography were discussed. The extraction was assisted by ultrasonic for 45 min,discontinuously. Perchloric acid extraction got the most efficiency,but coincidence degree of curves prepared on different days,daytime deviation and the slope of the conversion coefficient were not as good as another two,but these disadvantages could overcome by adjusting p H and ionic strength before analysing; Nitrate acid-potassium hydroxide method got similar efficiency as perchloric acid extraction,better precision,but more steps in determination procedure; ultrapure water extraction average effect is 80% of the former two. The results of ion-selective electrode and ion chromatography varied greatly,which needed further investigation.更多还原