Levels, Temporal-Spatial Variations, and Sources of Organochlorine Pesticides in Ambient Air of Lake Chaohu, China

Table 2

Residual levels of OCPs in ambient air at Lake Chaohu from March 2010 to February 2011.

	Gas phase		Particle phase		Total
	AM ± SD (pg/m^3)	Detection ratio	AM ± SD (pg/m^3)	Detection ratio	AM ± SD (pg/m^3)
α-HCH	16.1±12.4	95.8%	1.2±1.9	66.7%	17.3±12.8
β-HCH	7.3±12.4	87.5%	ND	ND	7.3±12.4
γ-HCH	10.0±9.8	95.8%	1.0±0.9	75.0%	11.0±9.5
δ-HCH	2.4±3.7	75.0%	0.2±0.5	20.8%	2.7±3.7
HCHs	35.8±29.7	95.8%	2.4±3.1	75.0%	38.2±29.3
o, p′-DDE	70.5±90.6	91.7%	0.1±0.5	8.3%	70.7±90.9
p, p′-DDE	22.1±22.3	83.3%	1.4±1.5	66.7%	23.5±21.6
o, p′-DDD	1.4±3.2	25.0%	1.7±3.6	29.2%	3.0±4.5
p, p′-DDD	1.3±1.4	62.5%	3.3±7.5	58.3%	4.6±7.1
o, p′-DDT	7.7±9.1	83.3%	3.3±3.7	70.8%	10.9±9.0
p, p′-DDT	5.6±7.5	79.2%	8.5±23.9	50.0%	14.1±27.2
DDTs	108.6±122.9	95.8%	18.3±26.1	79.2%	126.9±126.6
HCB	10.4±15.1	95.8%	1.6±0.7	100.0%	12.0±15.6
Heptachlor	5.0±5.8	62.5%	0.2±0.6	20.8%	5.3±6.1
Aldrin	13.5±27.9	62.5%	1.2±2.1	37.5%	14.7±27.7
Isodrin	2.4±2.7	79.2%	1.2±1.2	70.8%	3.6±2.7
α-Chlordane	56.4±137.2	87.5%	ND	ND	56.4±137.2
γ-Chlordane	4.2±4.0	83.3%	ND	ND	4.2±4.0
Chlordane	60.7±138.0	95.8%	ND	ND	60.7±138.0
Endosulfan I	200.6±246.5	91.7%	0.8±0.8	66.7%	201.4±246.2
Endosulfan II	45.0±66.3	79.2%	1.5±1.2	83.3%	46.4±66.1
Endosulfan	245.6±309.0	91.7%	2.3±1.7	87.5%	247.8±308.4
Endrin	1.3±2.2	29.2%	0.2±0.5	16.7%	1.5±2.2
Mirex	1.4±1.5	66.7%	ND	ND	1.4±1.5
Dieldrin	ND	ND	1.6±2.3	33.3%	1.6±2.3
Total	484.8±550.4	100%	28.9±28.7	100%	513.7±545.0

AM: arithmetic mean, SD: standard deviation, ND: not detected.