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布罗姆建议的锆茜素和氟的反应是测定氟的最灵敏的反应。我们制订的测定微量的氟(0.01-0.1毫克左右)的方法,是用0.001M硝酸锆在有茜素磺酸钠的盐酸溶液中直接滴定氟离子。分析手续在高25厘米、直径2厘米的平底烧瓶中,盛40毫升的水的试样,加1毫升0.01%茜素磺酸钠水溶液。在另一个同样的烧瓶中,盛40毫升重蒸馏水和1毫升指示剂。从烧瓶上面观察,若盛有水试样的烧瓶颜色与盛有蒸馏水的烧瓶颜色不同,则在盛水试样的烧瓶中小心搅拌,依pH值不同而一滴一滴地加入0.05N碱或酸,使水试样与标准
The reaction of zirconium alizarin with fluorine, suggested by Bromme, is the most sensitive reaction for the determination of fluorine. We developed a method for the determination of trace amounts of fluorine (0.01-0.1 mg or so) by titrating fluoride ions directly with 0.001 M zirconium nitrate in a solution of sodium alizarin sulfonate. Analysis procedures In a 25 cm high, 2 cm diameter flat-bottomed flask, a 40 ml sample of water was added to 1 ml of 0.01% sodium alizarin sulfonate solution. In another identical flask, 40 ml of double distilled water and 1 ml of indicator were added. From the top of the flask, if the color of the flask containing the water sample is different from the color of the flask containing distilled water, stirring is carefully performed in the flask containing the water sample, 0.05 N base or acid is added drop by drop depending on the pH, Make water samples and standards