Sodium cyanide

Sir,

I want to know how we can determine there is deficiency of sodium cyanide in rochelle copper bath. And method of calculating it to add.

Dilute 10 ml of bath to 100ml with DI water. Add 5 ml of 10% potassium iodide. Titrate to a permanent yellow/white turbidity (the endpoint). Record volume of titrant as T. T x 0.98 = g/l sodium cyanide T x 1.3 = g/l potassium cyanide You probably want to keep the free cyanide concentration in the range of 4-9 g/l.

Wet Analysis to determine sodium cyanide(free cyanide in this case)
pipette [pipettes on eBay or Amazon [affil link] 10 ml sample into a 150 ml flask.
Add 50 mls D.I. water.
Add 2 mls of Potassium Iodide Solution.
Titrate with 0.153 N Silver Nitrate Solution to a permanent opalescence end point.
Mls titrated X 0.2 = oz/gal Sodium Cyanide

oz/gal Sodium Cyanide required minus oz/gal figured from titration = oz/gal Sodium Cyanide to be added.

oz/gal needed to be added X tank volume = ounces to add.
ounces to add divided by 16 = pounds to be added.