Question: If one analyzes the lead (Pb) concentration extracted using HCl and finds it to be 50 g/L, calculate the Pb concentration in the extractible fraction

If one analyzes the lead (Pb) concentration extracted using HCl and finds it to be 50 g/L, calculate the Pb concentration in the extractible fraction in the initial solid (10 grams). The US Environmental Protection Agency recommends avoiding growing vegetables in soil with a total level above 400 mg/kg. In this case, is this soil considered safe regarding lead contamination?

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