Table 1.

The frequency, detection limit, quantification limit, standard deviation and average concentration of organochlorine pesticides (ng g⁻¹) in Huangpi soils.

OCPs			0–10 cm				10–20 cm
	DL	QL	Fre	Range	Ave	Std	Fre	Range	Ave	Std
α-HCH	0.05	0.17	94%	ND–0.36	0.07	0.11	100%	0.0002–0.12	0.03	0.04
γ-HCH	0.05	0.16	83%	ND–0.21	0.05	0.07	89%	ND–6.92	0.81	1.91
β-HCH	0.05	0.16	94%	ND–3.80	2.20	4.16	100%	0.01–79.9	7.71	18.62
δ-HCH	0.05	0.16	89%	ND–2.11	0.20	0.49	100%	0.0012–0.18	0.07	0.05
ΣHCHs				ND–16.48	2.52	4.83		0.010–87.12	8.62	20.62
p,p’-DDE	0.05	0.16	89%	ND–0.620	0.19	0.24	89%	ND–1.7	0.34	0.5
o,p’-DDT	0.05	0.15	50%	ND–1.34	0.22	0.48	67%	ND–1.63	0.21	0.47
p,p’-DDD	0.05	0.16	39%	ND–0.76	0.05	0.18	56%	ND–1.77	0.19	0.52
p,p’-DDT	0.05	0.16	61%	ND–13.5	1.17	3.32	56%	ND–8.23	0.7	1.99
ΣDDTs				ND–16.22	1.63	4.22		ND–13.33	1.44	3.48
ΣOCPs				ND–32.7	4.15	9.05		0.01–100.45	10.06	24.10

OCP is organochlorine pesticides, DL is detection limit, QL is quantification limit, HCH is hexachlorocyclohexanes, ND is not detected, Ave is average concentration, Std is standard deviation, Fre is frequency, DDT is dichlorodiphenyltrichloroethane, DDD and DDE are dichlorodiphenyldichloroethylene.