Distribution,Source Identification and Risk Assessment of Heavy Metals in Topsoil of Huairou District in Beijing

doi:10.19657/j.geoscience.1000-8527.2018.01.08

Abstract

Abstract:

At the agricultural area in the southeast of Huairou District in Beijing, 977 topsoil samples were collected, and 8 heavy metals in samples were analyzed, including Cr, V, Ni, As, Pb, Zn, Hg and Cd. The spatial distribution characteristics of these heavy metals were clearly illustrated by geochemical mapping. By applying the methods of multivariate statistics analysis, the concentration distributions of these heavy metals were dedi-cated, and the sources of them were determined, and risk assessment for them was also performed. The results show that the elements of Cr, V, Ni and As are mainly originated from soils parent materials. On the other hand, the elements of Pb, Zn and Hg are greatly influenced by the human activities, such as traffic and atmospheric deposition. Differently, Cd is mainly affected by inorganic fertilizer. The environmental risk of 8 heavy metals is assessed by Hakanson method, and all above heavy metals except Cd show a relatively low pollution risk. So, our study provides a significant reference for the risk assessment of agricultural soils and the future land-using plan at the area of Huairou District.

Key words: agricultural soil, heavy metal, distribution characteristic, source identification, risk assessment, Huairou District in Beijing

CLC Number:

P595
X142

LI Ping, HUANG Yong, LIN Yun, HUA Peixue, YUAN Guoli. Distribution,Source Identification and Risk Assessment of Heavy Metals in Topsoil of Huairou District in Beijing[J]. Geoscience, 2018, 32(01): 86-94.

Figures/Tables 10

References 47

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潜在生态风险系数(E(i))	单因子污染的生态风险	潜在生态风险指数(RI)	潜在生态危害程度
E(i)<40	低	RI<150	低
40≤E(i)<80	中	150≤RI<300	中
80≤E(i)<160	高	300≤RI<600	高
160≤E(i)<320	很高	600≤RI	重
320≤E(i)	极高	—	—

潜在生态风险系数(E(i))	单因子污染的生态风险	潜在生态风险指数(RI)	潜在生态危害程度
E(i)<40	低	RI<150	低
40≤E(i)<80	中	150≤RI<300	中
80≤E(i)<160	高	300≤RI<600	高
160≤E(i)<320	很高	600≤RI	重
320≤E(i)	极高	—	—

重金属	北京地区背景值^[19,33]	富集系数	最小值	最大值	均值	变异系数/%
Cr	60.8	0.84	14.00	91.0	50.9	20.7
V	79.2	0.90	31.50	114.0	71.3	19.2
Ni	24.7	0.88	1.40	53.2	21.7	32.5
As	7.7	0.95	1.29	15.6	7.3	36.5
Pb	23.7	1.09	24.90	22.6	25.9	37.5
Zn	57.5	1.33	33.70	77.5	76.5	38.6
Hg	0.059	0.71	0.007	0.372	0.042	93.6
Cd	0.119	1.41	0.047	0.140	0.168	68.1

重金属	北京地区背景值^[19,33]	富集系数	最小值	最大值	均值	变异系数/%
Cr	60.8	0.84	14.00	91.0	50.9	20.7
V	79.2	0.90	31.50	114.0	71.3	19.2
Ni	24.7	0.88	1.40	53.2	21.7	32.5
As	7.7	0.95	1.29	15.6	7.3	36.5
Pb	23.7	1.09	24.90	22.6	25.9	37.5
Zn	57.5	1.33	33.70	77.5	76.5	38.6
Hg	0.059	0.71	0.007	0.372	0.042	93.6
Cd	0.119	1.41	0.047	0.140	0.168	68.1

重金属	主成分
重金属	1	2	3
Cr	0.918	0.056	0.044
V	0.863	0.035	-0.045
Ni	0.844	0.010	0.060
As	0.747	0.167	0.067
Pb	0.117	0.652	0.364
Zn	0.178	0.747	0.403
Hg	-0.025	0.904	-0.104
Cd	0.007	0.195	0.935
特征值	3.144	2.015	0.807
方差/%	36.3	23.4	14.9
累积方差/%	36.3	59.7	74.6