新疆玛纳斯河流域地下水砷氟分布及共富集成因

doi:10.13866/j.azr.2023.09.06

Abstract

Abstract:

Arsenic (As) and fluoride (F) pollution in water bodies, along with their coexistence, are critical environmental concerns, with long-term exposure posing a significant threat to public health. This study focuses on the Manas River Basin as the research area, analyzing the hydrochemical, and spatial distribution characteristics of groundwater with high As and F content. Furthermore, the study aims to elucidate the hydrogeochemical processes related to the origin, migration, and enrichment of As, and F in groundwater, considering geological conditions, occurrence environments, and the influence of human activities. The results show that the groundwater in the study area exhibits an alkaline-reducing environment. The mass concentrations of As and F in groundwater range from 1.13 to 41.35 μg·L^-1 and from 0.06 to 8.02 mg·L^-1, respectively. Groundwater samples with high As and F content constituted 62.9% and 45.7% of the total samples, respectively, while samples with a coenrichment of As and F accounted for 37.1% of the total samples. As-F coenriched groundwater is mainly distributed in the northern plain region, near the edge of the desert, with the dominant hydrochemical types being HCO₃·Cl and HCO₃·SO₄·Cl. The primary sources of As and F in groundwater are high-content rock strata found in the southern mountainous area of the Manas River Basin. The high pH value, low SO₄^2-/Cl^-molar ratio, and low Eh of the high-As-content groundwater in the Manas River Basin indicate that a weak alkaline-reducing environment facilitates As enrichment in groundwater. Conversely, groundwater with high F content is characterized by high pH, HCO₃^-, and Na⁺ levels, as well as low Ca²⁺, indicating that an alkaline environment with high Na⁺ and low Ca²⁺content favors F enrichment in groundwater.

Key words: arsenic, fluoride, coenrichment, water chemistry, geological conditions, Manas River Basin

KANG Wenhui,ZHOU Yinzhu,SUN Ying,ZHOU Jinlong,CAO Yueting,LU Han,TU Zhi. Distribution and coenrichment of arsenic and fluorine in the groundwater of the Manas River Basin in Xinjiang[J].Arid Zone Research, 2023, 40(9): 1425-1437.

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References 29

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指标	单一结构潜水（n=3）			承压水区潜水（n=4）			承压水（n=28）
指标	均值	最小值	最大值	均值	最小值	最大值	均值	最小值	最大值
pH	7.86	7.36	8.28	7.87	7.77	7.97	8.71	8.11	9.09
K⁺+Na⁺	65.12	24.60	100.36	478.64	24.47	1565.54	168.87	36.42	843.83
Ca²⁺	54.42	31.30	88.20	126.13	34.52	277.50	27.55	3.20	290.70
Mg²⁺	8.67	5.60	14.60	134.61	4.14	397.60	11.70	0.49	152.00
Cl^-	42.39	14.18	70.00	453.82	21.00	1092.00	135.22	14.18	1178.00
SO₄^2-	110.81	57.43	206.00	981.14	31.55	3143.00	161.46	15.30	1488.00
HCO₃^-	178.29	109.88	264.00	323.57	120.00	895.00	151.76	95.23	615.00
TDS	376.28	215.85	612.00	2339.55	195.00	6803.00	591.63	174.49	4020.00
EC	568.33	265.00	959.00	3226.25	311.00	8804.00	887.43	228.00	5845.00
DO	0.84	0.22	1.42	0.79	0.06	1.37	0.46	0.01	1.27
Eh	-44.43	-51.60	-36.60	-40.90	-60.90	-30.30	-96.79	-125.10	81.20
As	1.27	1.13	1.38	2.80	1.13	4.00	18.95	1.81	41.35
F	0.21	0.06	0.28	0.57	0.26	1.41	1.92	0.44	8.02

指标	含水层类型	N	最小值	最大值	均值	超标个数	超标率/%
砷As	单一结构潜水	3	1.13	1.38	1.27	0	0.0
	承压水区潜水	4	1.13	4.00	2.80	0	0.0
	承压水	28	1.81	41.35	18.95	22	78.6
氟F	单一结构潜水	3	0.06	0.28	0.21	0	0.0
	承压水区潜水	4	0.26	1.41	0.57	1	25.0
	承压水	28	0.44	8.02	1.92	15	53.6

指标	含量	N	最小值	最大值	均值
pH	As≤10 μg·L^-1	13	7.36	8.70	8.11
	F≤1 mg·L^-1	19	7.36	9.02	8.38
	As>10 μg·L^-1	22	8.36	9.09	8.79
	F>1 mg·L^-1	16	7.97	9.09	8.73
	砷氟共富集取样点	13	8.66	9.09	8.88

Distribution and coenrichment of arsenic and fluorine in the groundwater of the Manas River Basin in Xinjiang

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