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Then, α-HCH/γ-HCH and β-/(α+γ)-HCH ratios were used to look for the sources of OCPs. In accordance with the α-HCH/γ-HCH ratios, the principal sourced elements of OCPs both in nations were lindane. Likewise, according to β-/(α+γ)-HCH ratios, the HCHs have been historically used in Peru while they had been recently found in chicken. Eventually, homologous group distributions were used to determine the sources of PCBs. Comparable distributions of homologou