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Due to its serious health risks, lead (Pb) in rice, specifically its uptake, translocation, and accumulation mechanisms and its toxic effects have been studied intensively in recent years. However, it remains unclear about the role of phytolith, a siliceous structure in rice plants, in the storage and release kinetics of Pb in rice. This study aims at elucidating a possible encapsulation of Pb in the phytolith structure (phytPb), and identifying whether or not phytPb provides a source of Pb in soil, when returned to the field with the rice straw or in a related processed product such as ash from on-site burning. To date there has not been any specific work targeted at the determination of phytolith-associated heavy metals in general and phytPb in particular, and therefore this possible source of Pb in soils may have been overlooked. Phytoliths were included in a study of rice paddy soil and rice straw to demonstrate accumulation of …