Geochemical Characteristics and Risk Assessment of Lead in the Soils of Jiucheng—Jiemao District in Yingjiang, Yunnan

doi:10.19657/j.geoscience.1000-8527.2020.05.11

Abstract

Abstract:

Based on 4,706 topsoil samples and 9 vertical soil profiles of Jiucheng—Jiemao district in Yingjiang County, Yunnan Province, the geochemical characteristics of lead in soils were studied and human health risk assessment was performed in combination with the Second National Land Survey Patch. The results showed that the average concentration of Pb in the topsoils was 43.40 mg/kg, while the background concentration of Pb was 1.55 times of that in A horizon of National Soil Survey. The ratio of the samples exceeding the national standard(GB 15618—2018) was 3.10%. A significant difference occurred in the spatial distribution of Pb in soils which was affected by both soil parent materials and anthropogenic activities. The Pb content characteristics in the residual soil profiles had more inherited the characteristics of their parent material, showing a lightly enrichment from the top layer to the deep layer. The characteristics of the Pb content in the soils developed by different parent materials were as follows: granite>slate>gneiss, metagranite>clastic rock. Obviously, the human activities were superimposed in the alluvial soil profile so that the Pb content showed an enrichment from deep to top. The possibility of human health risks caused by soil Pb in the study area was relatively small. And the soil could be utilized safely under current land pattern.

Key words: lead, soil, geochemical characteristics, soil parent material, risk assessment, Yingjiang County

CLC Number:

P595
X142

ZONG Qingxia, XIAO Gaoqiang, XIANG Longzhou, XU Yongqiang. Geochemical Characteristics and Risk Assessment of Lead in the Soils of Jiucheng—Jiemao District in Yingjiang, Yunnan[J]. Geoscience, 2020, 34(05): 979-986.

Figures/Tables 8

Fig.1 Location of the study area and simplified geological map

Table 1 Calculation formulas of metal exposure dose for three exposure pathways

暴露途径	计算公式
饮食摄入	ADD_食用=C_土壤× $BCF × I R 食 × EF × ED BW × AT$
无意吸食	ADD_吸食=C_土壤× $I R 土 × EF × ED × CF BW × AT$
皮肤接触	ADD_皮肤=C_土壤× $SA × AF × ABS × EF × ED × CF BW × AT$

Table 1 Calculation formulas of metal exposure dose for three exposure pathways

暴露途径	计算公式
饮食摄入	ADD_食用=C_土壤× $BCF × I R 食 × EF × ED BW × AT$
无意吸食	ADD_吸食=C_土壤× $I R 土 × EF × ED × CF BW × AT$
皮肤接触	ADD_皮肤=C_土壤× $SA × AF × ABS × EF × ED × CF BW × AT$

Table 2 Descriptive statistics of Pb in soils of the study area

统计参数	水田	旱地	园地	林地	居民、工矿	其他用地	全区
样品数	1 380	1 089	1 538	546	112	41	4 706
平均值	40.08	45.11	42.93	47.84	53.29	41.25	43.40
最大值	372	623	899	848	221	90	899
最小值	14.70	16.60	7.50	13.10	25.20	18.80	7.50
标准偏差	14.03	20.75	31.65	57.27	32.89	11.23	29.99
变异系数	0.35	0.46	0.74	1.20	0.62	0.27	0.69
背景值	39.04	43.73	38.90	39.41	41.44	40.03	40.27
富集系数^*	1.50	1.68	1.50	1.52	1.59	1.54	1.55
超标率^**	0.51	1.10	5.01	6.04	14.29	2.44	3.10

Fig.2 Background value and variable coefficient of Pb in soils from different stratigraphic units of the study area(The red line is the background value of the study area)

Table 3 Semivariogram model and parameters of Pb in soils of the study area

元素	拟合模型	块金值(C₀)	基台值(C₀+C)	块金值/基台值/%	决定系数R²	变程/km
Pb	指数模型	25	87.75	28.49	0.950	9.09

Fig.3 Spatial distribution of Pb content in soils of the study area

Fig.4 Content characteristics of Pb in the vertical soil profiles

Fig.5 Human health risk assessment for Pb in soils of the study area

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