Determining alkali metals and alkaline earth metals by ion
chromatographic analysis
Ion chromatography for quality assurance
Alkali metals and alkaline earth metals, antioxidants
and anions such as chloride and sulfate can be determined
by ion chromatography in order to check fulfillment of the
requirements of DIN EN 14 214, DIN
V 51 605 and ASTM D 4806 and therefore
prevent motor damage.
Quality monitoring
After esterification and subsequent treatment, alkali metals
and alkaline earth metals may be present in biofuel as unwanted
residues. They form salts with the anions
contained in biofuel and these block the fuel filter.
In addition to this primary damage, secondary damage is caused
to the injection pump. Standard DIN EN 14 214
permits a cumulative concentration of 5 mg/kg for both the
alkali metals sodium and potassium
and also for the alkaline earth metals magnesium
and calcium. Both groups of cations can be
determined rapidly and accurately in a single ion chromatography
run. This saves time and money.
The samples are extracted with dilute nitric acid, dialyzed
and then injected directly into the IC system.
Ion Chromatography by Metrohm
The complete sample preparation procedure and analysis takes
place fully automatically. The combination of instruments
used consists of the 861 Advanced Compact IC
with Metrohm inline extraction and dialysis. Both inline extraction
and inline dialysis represent a form of the Metrohm
Inline Sample Preparation «MISP».
Metrohm IC systems are characterized by their compact and
robust design. The costs for consumables and reagents are
reduced to a minimum. The complete system is PC-controlled.
The IC Net software used can be understood
intuitively and is therefore very user-friendly.
Product Information
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Biofuel
Analysis 
