Extractable Metals, 1 M HNO3

Metals are extracted by shaking 3 g of air dried soil in 30 mL of 1 N HNO3 for 1 hour. After centrifugation, the supernatant analyzed for Al, Cd, Cr , Cu, Fe, Mn, Ni, Pb, and Zn by ICP-OES.

(See Method References No. 32 & 21) 

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