Distribution and Health Risk Assessment of HCHs in Urban Soils ofBeijing, China

Lingyan Yang Xinghui Xia Lijuan Hu

School of Environment, BeijingNormalUniversity /State Key Laboratory of Water Environment Simulation, Beijing, 100875, China

SupplementaryMaterial

There are two figures and two tables.

Table S1Concentrations of HCHs in soils in this study and other areas (ng/g)

Area / Land use / ΣHCHs / Reference
Tibet, China / Soil in pristine areas / 0.18-5.38 / Fu et al., 2001
Beijing, China / Soils from Guanting Reservoir / NDb -19.23, / Zhang et al.,2005
Shanghai, China / urban soil (n=55) / ND b -38.58 / Jiang et al., 2010
Taiyuan, China / Urban soil (n=15) / 1.4-45, 4.6(median) / Fu et al., 2009
Hong Kong, China / Surface soil (n=66) / 6.19±1.31 (Mean) / Zhang et al.2006
Yinchuan, China / Urban soil (n=16) / 0.306-74.2, 7.98(Mean) / Wang et al., 2009
Romania / Rural soil（n=7）
Urban soil （n=13） / 28.4±33.7, 29.2±27.1 (Mean) / Covaci et al.,2001
Krakow, Poland / Urban and rural soil (n=24) / 11±29 (Mean) / Falandysz et al.,2001
Katowice, Poland / Urban and rural soil (n=24) / 6±3 (Mean) / Falandysz et al.,2001
Beijing, China / Urban soil / 0.32-136.43
7.35±16.62 (Mean)
3.46 (Geometric)
3.03 (median) / This study
Beijing, China / Rural soil / 0.37-62.46
5.18±9.75 (Mean)
2.96 (Geometric)
2.72 (median) / This study
Beijing, China / Urban and rural soil / 0.32-136.4
6.83±15.29 (Mean)
3.32 (Geometric)
2.98 (median) / This study

bnot detected

Table S2 Major parameters from the sensitivity analysis in CalTOX model

parameter / Contribution to variance of total risk (%)
α-HCH / β-HCH / γ-HCH
Thalf / 93.87 / 81.32 / 87.96
dfct_sl / - / 3.92 / 1.32
EFsl / - / 1.32 / -
ED / 1.02 / 2.8 / 3.84
foc_s / 1.52 / 4.52 / 2.46
Koc / - / 1.48 / -

Thalf(d): Reaction half-life in soil; dfct_sl: Fraction dermal uptake from soil; Efsl(d/y): Exposure frequency to soil on skin; ED(years):Exposure duration; foc_s: Organic carbon fraction in upper soil zone; Koc: Organic carbon partition coefficient; -:<1% variable

Fig.S1 Concentrations of HCHs in different ring road in urban soil of Beijing

Fig. S2 Correlations of HCHs with soil pH, TOC and BC

*Corresponding author. Tel.: +86 10 58805314; fax: +86 10 58805314.

E-mail address: (X. Xia).

Hexachlorocyclohexanes (HCHs), Pentachloronitrobenzene (PCNB),business area (BU), classical garden (CL), culture and educational area (CU), large public green space (LA), residential area (RE), roadside area (RO)