Figure 2
From: Straw phytolith for less hazardous open burning of paddy straw
Thermal resistance of phytolith occluded OC: (A) plots of weight loss and OC content upon increases in heating temperature, by which some thermal recalcitrant OC is indicated; (B) a microscopic image showing an open-burning derived phytolith fragment and its occluded OC; (C) EDX spectra representing the surface chemical composition of a phytolith fragment; and (D) the typical Si 2p XPS survey spectra of a phytolith fragment (R refers to any chain of carbon atoms (alkyl group) or a single hydrogen atom).
