The standard DIN EN 14214 for biodiesel specifies the method for determining the acid value by non-aqueous acid-base titration and the iodine value by redox titration of sodium thiosulfate. The equivalence point of acid value determination is determined by Solvotrode electrode; the equivalence point of iodine value determination is determined by Pt Titrode electrode. Both methods are easy to use and have high accuracy and precision. The acid value of the test sample is 0.202mg/g and the iodine value is 114.4g I2?/100g, which fully meets the requirements of the acid value 0.5mg/g and the iodine value of 120 I2?/100g specified in the DIN EN 14214 standard.

        According to ASTM standard D 4806, lead nitrate is used to determine the total sulfate in bioethanol. The Pb selective electrode is used as the working electrode, and the double-liquid junction Ag/AgCl electrode or glassy carbon electrode is used as the reference electrode. Although both reference electrodes have good recovery rates, the glassy carbon electrode is easier to maintain. The ideal test range for the two electrodes is 1-20ppm. The corresponding recovery rate is 98%-109%. By adding the sulfate standard substance and increasing the concentration of perchloric acid in the commercial bioethanol (E85), the sub-ppm sulfate can be detected.

        Biofuels obtained from renewable plant resources have attracted great attention in recent years. The reason lies in the increasing demand for mineral oil and the environmental pollution caused by the burning of mineral oil. In order to prevent biofuels from interfering with the engine's fuel injection system and the engine itself, vehicle and biofuel manufacturers have put forward corresponding quality standards. These standards specify test methods and the quality of biofuels. There are two main biodiesel standards, namely EN 14214 in Europe and ASTM D 6751 in the United States. There is only one standard for bioethanol, that is, ASTM D 4806 in the United States. ASTM D 4806 is equivalent to the European EN 15376 standard, and EN 15376 is gradually being improved.

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        About Metrohm:

        In 1950, Metrohm invented a composite pH electrode.

        In 1954, Metrohm designed and introduced a practical automatic polarograph for trace analysis.

        In 1956, Metrohm developed a piston-type burette.

        In 1968, Metrohm created the world's digital titrator, a digital electronic burette.

        ...

        In 2007, Metrohm developed an intelligent ion chromatograph.

        In 2010, Metrohm developed the World Ultraviolet Ion Chromatography.

        Metrohm-Metrohm is one of the few international analytical instrument companies in the world that covers all kinds of different ion analysis technologies.