Method comparison study for weak acid dissociation cyanide analysis.
Method comparison studies of two different methods for the analysis of weak acid dissociable (WAD) cyanide revealed analytical flaws and/or matrix interference problems with both procedures. EPA "draft" method 1677 using a Perstorp 3202 CN analyzer was compared to Standard Method 4500 CN I. It was discovered that the Perstorp analyzer produced more precise and more accurate results once appropriate and necessary procedural steps from the EPA draft method were modified. Comparison of these two methods, was based on "real world" samples collected from a mine-tailing solution. The mine-tailing solution contained high concentrations of cyanide and metals. Inconsistencies in method procedures were traced to sulfide interferences and high concentrations of WAD metals. Conclusions were based upon a large sample base collected from a mine site over a 90-day period.
Evans
Joseph D
JD
Science Applications International Corporation, 950 Energy Drive, Idaho Falls, Idaho 83401, USA. evansjo@saic.com
Thompson
Leslie
L
Clark
Patrick J
PJ
Beckman
Scott W
SW
D003486:Cyanides / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008906:Mining; D008962:Models, Theoretical
D003486:Cyanides; D004785:Environmental Pollutants