-
-
Trace Total Mercury Analysis
Mercury Speciation of River Water
Mercury Speciation of Lake Water
Mercury Speciation of Soil
Mercury Speciation of Tissue
-
-
Energy
EnvironmentalPharmaceutical
ResearchNutraceutical
Regulatory ComplianceTextile
Treatment Optimization
-
-
Our Commitment to Quality
Approach to QualityQuality Control
CertificationQuality Assurance
Laboratory Information Management System (LIMS)
Applied Speciation has developed a new method for cyanide
analysis, ion chromatography pulsed amperometric detection (IC-PAD),
which reduces the positive and negative interferences associated
with most other amperometric and colorimetric methods. IC-PAD
chromatographically separates interfering ions prior to amperometric
detection and does not require chemical reactions to form a light
absorbing compound.
Cyanide quantitation by colorimetry uses either a pyridine-pyrazole
or pyridine-barbituric acid reaction to form a compound which
absorbs at 620 nm or 578 nm, respectively. The distillation
procedure required prior to color formation is designed to convert
other cyanide complexes to free cyanide (in the final distillate).
Although the distillation procedure is efficient at separating most
interfering metal compounds organics can often be transferred to the
distillate which can interfere with the color forming reaction. This
interference can result in unrepresentative results and failing
quality control parameters.
Some methods employing amperometric detection rely on separation of
interfering ions by membrane diffusion. While this method of
separation can be quite efficient the capacity of the membrane to
totally eliminate false positives is intrinsically limited.
The IC-PAD method was developed to provide free cyanide and total
cyanide quantitation in highly complex waste streams which could not
be supported by currently accepted methods. A higher degree of
confidence can be achieved for your cyanide analytical needs at a
competitive price.
Link: Determination-of-Metal-Cyanide-Complexes