Keywords: آلودگی سطحی خاک; Stockholm Convention; Surface soil contamination; Regulatory guidance values; Persistent organic pollutants; Pesticides; α-HCH; β-HCH; γ-HCH; δ-HCH; Chlordane; Kepone; Endosulfan; Endosulfan I; Endosulfan II; Endosulfan sulfate;