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Dark‐colored soil organic matter could be oxidized with 6% H2O2 to make graphitized charcoal more visible. A pretreatment with 4 N HC1 removed the more soluble compounds that might react with H2O2 and a post treatment with 48% HF volatilized Si to concentrate the charcoal in the remaining residue. The pre‐weighed H2O‐washed residue was ignited in a muffle and the charcoal estimated from the weight loss.
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