Boron is extracted by boiling under reflux 10 g of air-dry soil with 20 mL of 0.01M CaCl2 for 7 minutes in a reflux digestion apparatus. After slight cooling, the sample is filtered and the filtrate is acidified and analyzed by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES).
(See Method References No. 19, 20, & 21)
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