Transfer to a separator, add 5 drops of Ammonium Citrate Solution.) Add 2 drops of phenol red TS,
thymol blue TS, then add ammonium hydroxide until the and make the solution just alkaline (red in color) by the
solution assumes a yellow color. Add 10 mL of sodium addition of ammonium hydroxide. Cool the solution if necdiethyldithiocarbamate
solution (1 in 25), mix, and allow to essary, and add 2 mL of Potassium Cyanide Solution. Immedistand
for 5 minutes. Extract this solution with successive 10- ately extract the solution with 5-mL portions of Dithizone
to 15-mL portions of chloroform until a 5-mL portion of the Extraction Solution, draining off each extract into another
chloroform extract does not assume a yellow color when separator, until the dithizone solution retains its green color.
shaken with cupric sulfate TS. Add 3 N hydrochloric acid Shake the combined dithizone solutions for 30 seconds with
until the solution is pink (if necessary, add 1 or 2 drops 20 mL of dilute nitric acid (1 in 100), and discard the chlomore
of thymol blue TS), and then dilute with water to roform layer. Add to the acid solution 5.0 mL of Standard
100 mL. Dithizone Solution and 4 mL of Ammonia-Cyanide Solution
Transfer to a separator, add 5 drops of Ammonium Citrate Solution.) Add 2 drops of phenol red TS,thymol blue TS, then add ammonium hydroxide until the and make the solution just alkaline (red in color) by thesolution assumes a yellow color. Add 10 mL of sodium addition of ammonium hydroxide. Cool the solution if necdiethyldithiocarbamatesolution (1 in 25), mix, and allow to essary, and add 2 mL of Potassium Cyanide Solution. Immedistandfor 5 minutes. Extract this solution with successive 10- ately extract the solution with 5-mL portions of Dithizoneto 15-mL portions of chloroform until a 5-mL portion of the Extraction Solution, draining off each extract into anotherchloroform extract does not assume a yellow color when separator, until the dithizone solution retains its green color.shaken with cupric sulfate TS. Add 3 N hydrochloric acid Shake the combined dithizone solutions for 30 seconds withuntil the solution is pink (if necessary, add 1 or 2 drops 20 mL of dilute nitric acid (1 in 100), and discard the chlomoreof thymol blue TS), and then dilute with water to roform layer. Add to the acid solution 5.0 mL of Standard100 mL. Dithizone Solution and 4 mL of Ammonia-Cyanide Solution
การแปล กรุณารอสักครู่..
