In times of skyrocketing gasoline prices and climate
changes, ethanol fuel is a promising renewable high-octane
vehicular fuel. A major drawback, however, is the contamination
with inorganic salt ions such as chloride,
nitrate and sulfate. These ions can affect engine
performance because precipitating salts clog
filters and fuel injector nozzles. Furthermore, these
ions enhance corrosion in the vehicle
components in contact with the fuel. Hence there is
an urgent need for standards defining quality specifications
and test methods.
For chloride two different standards define two different
methods:
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Biofuel
Analysis 
