Analytical methods and standards for quality assurance in biodiesel production

Fuel quality of biodiesel and its blends depends on the raw materials and chemicals used in transesterification, production process parameters and post-production conditions. Biodiesel feedstock analytical methods are outlined. Vital off-line, at-line, in-line and on-site chemical and physical analyses for production facilities and terminal services are described. The role of regulatory agencies and testing laboratories is illustrated and the current status of international biodiesel (blend) specifications is given. Biodiesel quality management sets different analytical requirements at various stages of the product life cycle, involving production, blending, transportation and storage, filling stations, consumers and car manufacturers. Fuel quality surveys have indicated that biodiesel batch-to-batch consistency needs further improvement.