1 μg/L = 1,000 ng/L 1 mg/L = 1 ppm 1 μg/L = 1 ppb 1 ng/L = 1 ppt 1 ppm = 1,000 ppb 1 ppb = 1,000 ppt. Concentraciones en el suelo. 1 mg/kg = 1,000 μg/kg
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