Page 9 of Quality assurance of biofuels by Metrohm AG

· chloride in bioethanol the chloride content in bioethanol fuels is the subject of astm d 512 quantitation can be carried out by mercurimetric or argentometric titration or by direct determination with a cl-selective electrode argentometric titration with silver nitrate is the method of choice because of its environmental advantages and very high precision a defined volume of the sample is pipetted into the titration cell treated with 5 ml nitric acid 2 mol/l and then titrated against silver nitrate solution 0.01 mol/l · sulfate in bioethanol a proven method for sulfate determination is potentiometric titration with lead nitrate using a pb-selective electrode the ph of the sample is adjusted to ph 3 5 with perchloric acid and the sulfate is then precipitated out with lead nitrate solution the pb-selective electrode detects the first excess of lead ions at the equivalence point the titrando ­ the all-rounder for potentiometric titration the wide range of potentiometric applications for biofuels requires a highly flexible titrator no other titration system offers more flexibility and working comfort than the titrando · with touch control the pc control software or tiamotm ­ titration and more ­ operation is child s play · the space-saving dosino technology with numerous liquid-handling functions simplifies sample preparation and allows automatic preparation and emptying of burets without operator intervention ­ it is no longer necessary to handle organic solvents · intelligent dosing units and electrodes eliminate confusion extensive glp functions guarantee safe and error-free work · the titrando is unbelievably flexible ­ it covers the whole range from a simple stand-alone titrator up to a fully automatic titration system with sample changer direct balance connection and barcode reader the titrando offers maximum flexibility and operating comfort 9

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