Factors Affecting Mobility of Lead in the Soils of the Dongting Lake Plain, China

doi:10.19657/j.geoscience.1000-8527.2019.04.09

Abstract

Abstract:

In order to systematically explore the mobility characteristics of Pb in the soils of the Dongting lake plain and its influence factors, 110 soil samples had been collected in Changde, Yiyang and Zhuzhou city. This study discussed the relationships between mobility of Pb and organic matter, pH, cation exchange capacity (CEC) and other parameters in soils. Based on their correlations, we established prediction models for the mobility of Pb. The results showed that Pb content, pH, organic matter content, CEC and weathering degree were the main factors affecting the mobile fraction and coefficient of Pb. They affected the mobility of Pb by changing the buffer capacity of the soil. Soil Cd content and Zn/Pb ratio were also significantly correlated with the mobile fraction of Pb. The interactions between Cd and Pb were different in different concentration gradients. The mobile fraction of Pb was lower when the soil had a higher Zn/Pb ratio. The multivariate stepwise regression analysis was adopted to establish prediction models for mobile fraction and mobility coefficient of Pb. The presented models had achieved good predicting effectiveness,when mobile fraction of Pb in soils was predicted by soil pH, Pb content, CEC and Na₂O/K₂O ratio and mobility coefficient of Pb was predicted by pH, CEC, SiO₂/Al₂O₃ ratio.

Key words: Dongting lake plain, soil, Pb, mobility, influence factors

CLC Number:

P595
X142

DAI Gaole, HOU Qingye, YANG Zhongfang, JIANG Hua, YUAN Jiaxin, TANG Zhimin. Factors Affecting Mobility of Lead in the Soils of the Dongting Lake Plain, China[J]. Geoscience, 2019, 33(04): 783-793.

Figures/Tables 14

References 58

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指标(元素)	分析方法	检出限^*
SiO₂	X荧光光谱法(XRF)	0.05
Al₂O₃	X荧光光谱法(XRF)	0.01
TFe₂O₃	X荧光光谱法(XRF)	0.01
MgO	X荧光光谱法(XRF)	0.02
CaO	X荧光光谱法(XRF)	0.02
K₂O	X荧光光谱法(XRF)	0.01
Na₂O	X荧光光谱法(XRF)	0.02
pH	离子选择电极法(ISE)	—
有机质	容量法(VOL)	0.05
Cd	等离子体质谱法(ICP-MS)	0.02
Pb	等离子体质谱法(ICP-MS)	1.5
Zn	等离子体质谱法(ICP-MS)	1

指标(元素)	分析方法	检出限^*
SiO₂	X荧光光谱法(XRF)	0.05
Al₂O₃	X荧光光谱法(XRF)	0.01
TFe₂O₃	X荧光光谱法(XRF)	0.01
MgO	X荧光光谱法(XRF)	0.02
CaO	X荧光光谱法(XRF)	0.02
K₂O	X荧光光谱法(XRF)	0.01
Na₂O	X荧光光谱法(XRF)	0.02
pH	离子选择电极法(ISE)	—
有机质	容量法(VOL)	0.05
Cd	等离子体质谱法(ICP-MS)	0.02
Pb	等离子体质谱法(ICP-MS)	1.5
Zn	等离子体质谱法(ICP-MS)	1

形态	提取剂	检出限/(mg/kg)
水溶态	2.5 000 g样+25 mL水	0.1
离子交换态	25 mL MgCl₂溶液	0.5
碳酸盐结合态	25 mL NaAc溶液	0.5
腐殖酸结合态	50 mL Na₄P₂O₇溶液	0.5
铁锰氧化态	25 mL HONH₃Cl溶液	0.5
强有机结合态	8 mL H₂O₂-HNO₃溶液	0.5
残渣态	HNO₃-HClO₄溶解	2

形态	提取剂	检出限/(mg/kg)
水溶态	2.5 000 g样+25 mL水	0.1
离子交换态	25 mL MgCl₂溶液	0.5
碳酸盐结合态	25 mL NaAc溶液	0.5
腐殖酸结合态	50 mL Na₄P₂O₇溶液	0.5
铁锰氧化态	25 mL HONH₃Cl溶液	0.5
强有机结合态	8 mL H₂O₂-HNO₃溶液	0.5
残渣态	HNO₃-HClO₄溶解	2

指标	准确度(ΔlgC_GBW)	精密度(λ)
Al₂O₃	0.013	0.023
CaO	0.020	0.040
MgO	0.018	0.041
Na₂O	0.016	0.035
K₂O	0.014	0.020
SiO₂	0.013	0.028
TFe₂O₃	0.017	0.036
Cd	0.011	0.035
Pb	0.015	0.055
Zn	0.008	0.024
pH	0.044	—
有机质	0.012	0.013