Sources and influencing factors of arsenic in nearshore zone during river water infiltration

doi:10.13745/j.esf.sf.2021.10.3

Abstract

Abstract:

The Shenyang Huangjia water source area is a typical riverside groundwater source area in northern China. In its nearshore zone the iron (Fe), manganese (Mn) and arsenic (As) contents were well above the safety standard. In order to find out the sources and influencing factors of groundwater As in the affected area, samples of river water, groundwater and soils of the study area were collected and tested. Water quality indexes and carbon and sulfur stable isotopes of water samples, and the contents and occurrences of typical minerals and As in soil samples were analyzed. The results showed that As contents were very low in river water samples but generally exceeded the standard in groundwater samples. In the early stage of river water infiltration, some As-bearing minerals were oxidized by oxidizing river water and As was released. Later on, the groundwater environment became reductive with the infiltration of river water, and reductive dissolution of As-bearing Fe/Mn minerals resulted in the gradual increase of groundwater As. Typical minerals in the study area were pyrite, siderite, pyrolusite, hematite, goethite, rhodochrosite, etc. Through desorption of exchangeable arsenic, oxidation of organic matter-bound arsenic, and reductive dissolution of iron-manganese oxide-bound arsenic, As was release into the groundwater. To a certain extent, As content in the groundwater was negatively correlated with groundwater pH and redox potential (Eh) and positively correlated with the dissolved organic carbon (DOC), $HCO 3 -$ , Fe and Mn contents.

Key words: river water infiltration, nearshore zone, groundwater, arsenic, Shenyang Huangjia water source area

CLC Number:

P641
X523

LU Shuai, SU Xiaosi, FENG Xiaoyu, SUN Chao. Sources and influencing factors of arsenic in nearshore zone during river water infiltration[J]. Earth Science Frontiers, 2022, 29(4): 455-467.

Figures/Tables 15

Fig.1 Geography of the study area

Table 1 Monitoring well related parameters

井号	井深/m	过滤器深度/m	止水深度/m
井号	井深/m	过滤器深度/m	顶部	底部
HB1-2\HB2-2\HB3-2\HB4-2	6.0	4.0~<5.0	3.0~<4.0	5.0~<6.0
HB1-3\HB2-3\HB3-3\HB4-3	7.0	5.0~<6.0	4.0~<5.0	6.0~<7.0
HB1-4\HB2-4\HB3-4\HB4-4	8.0	6.0~<7.0	5.0~<6.0	7.0~<8.0
HB1-5\HB2-5\HB3-5\HB4-5	9.0	7.0~<8.0	6.0~<7.0	8.0~<9.0
HB1-6\HB2-6\HB3-6\HB4-6	10.0	8.0~<9.0	7.0~<8.0	9.0~<10.0
HB3-7\HB4-7	11.0	9.0~10.0	8.0~9.0	10.0~11.0

Fig.2 Diagram of pH, Eh, and DO concentration during river water infiltration (The sampling depth of groundwater is 5.0-6.0 m)

Fig.3 Diagram of DOC, HCO 3 -, Mn2+, Fe2+, SO 4 2 -, As concentration during river water infiltration (The sampling depth of groundwater is 5.0-6.0 m)

Fig.4 Vertical variation diagram of hydrochemical index in nearshore zone (The sampling location of groundwater is 6.5 m away from the riverbank)

Fig.5 Scanning electron microscope images of typical minerals in the study area

Fig.6 Total arsenic content in the medium

Fig.7 The percentage of arsenic content in sequence extraction test

Fig.8 Effective arsenic content and F1-As/EFC-As, F3-As/EFC-As, F4-As/EFC-As, As/TAs percentages in the medium

Fig.9 F1-Fe/EFC-Fe, F3-Fe/EFC-Fe, As/Tas, Fe2+/TFe percentages in the medium

Fig.10 Relationship between arsenic concentration and pH, Eh in groundwater

Fig.11 Relationship of As-DOC, δ13CDIC-δ13CDOC in groundwater

Fig.12 Relationship between arsenic content and HCO 3 - concentration in groundwater

Fig.13 Relationship between arsenic concentration and Fe, Mn concentration in groundwater

Fig.14 Relationship of As-SO 4 2 -, δ34 S- SO 4 2 - in groundwater

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