Page:NIOSH Manual of Analytical Methods - 6017.pdf/5

 HYD RO GE N C YAN IDE: ME TH OD 6017, Issue 1, dated 1 5 Ma rch 2003 - Page 5 of 5

APPENDIX: STANDARDIZATION OF CALIBRATION STOCK SOLUTION Titrate an aliquot of the cyanide standard stock solution (Reagent 12) with standard silver nitrate (AgNO 3) solution. The end point is the first formation of a white precipitate, Ag[Ag(CN) 2]. Calculate the cyanide concentration with the following equation: M c = 52.04 V a (M a/V c) W here:

Mc = Va = Ma = Vc =

cyanide concen tration (m g/m L). volume (m L) of standard silver nitrate solution. concentration (moles/L) of standard silver nitrate solution. volume (m L) of calibration stock solution titrated.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition