你说的是Nessler试剂吧,按下面的方法配,从来没有异常
52.2 Nessler’s Reagent:
52.2.1 Solution A—Dissolve 270 g of sodium hydroxide
(NaOH) pellets in water and dilute to 1 L.
52.2.2 Solution B—Dissolve 36 g of potassium iodide (KI)
crystals and 13.6 g of mercuric chloride (HgCl2) powder in
water and dilute to 500 mL. To prepare the Nessler’s reagent,
mix three parts of Solution A with 5 parts of Solution B. It
should be allowed to stand until the solution is clear before
using. (Warning—Solution B and the Nessler’s reagent are
highly toxic.)