Selective Extraction of Organic Contaminants from Soil Using Pressurised Liquid Extraction

Table 4

PAH concentration found in the reference soil CRM1944 (NIST, New York/New Jersey Waterway Sediment), using selective PLE (0.5 g of soil, 5.0 g of silica packed inside the extraction cell, solvent: 𝑛-hexane, 125°C, 1400 psi, 10 min static extraction).All values are expressed in mg/kg dry mass.

Compound	Concentration found; (mg/kg dry mass), 𝑛=3	Certified concentration values (mg/kg dry mass)
Naphtalene; Pyrene; Benzo[a]anthracene; Benzo[a]pyrene	1.51 ± 0.17; 7.68 ± 0.41; 4.10 ± 0.29; 4.20 ± 0.01	1.65 ± 0.31; 9.70 ± 0.42; 4.72 ± 0.11; 4.30 ± 0.13