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The HF treatment was performed four times for 1 h, then twice for 24 h, with the supernatant being discarded each time.
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ÍêÕûÔ­ÎÄ£ºFive grams of soil were placed into a 125 mL polyethylene centrifuge tube along with 10 mL of 10% HF prepared following the method of Robl and Davis. The soil/HF slurries were shaken end-to-end for 1 h, centrifuged at 1790 g for 10 min, and then filtered through Whatman grade GMF 2UM qualitative filter paper (Whatman International, England). The HF treatment was performed four times for 1 h, then twice for 24 h, with the supernatant being discarded each time. The residue was washed five times with ultrapure water(18 M ¦¸), lyophilized, and then stored in glass vials until further analysis.

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