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As a typical arid oasis in northwest China, economic development in the Turpan Basin is heavily dependent on groundwater. In this study, hydrogeochemical mechanisms controlling groundwater boron (B) enrichment and associated health risks through an integrated approach combining hydrochemical analysis, isotopic tracing, and UNMIX receptor modeling were systematically investigated based on 6 river water and 49 groundwater collected in the study area. The results indicated that: (1)surface water in the study area was neutral to slightly alkaline, while groundwater ranged from slightly acidic to slightly alkaline;groundwater B existed in a mixed form of H3BO3 and B(OH)4-, with H3BO3 being the dominant species. (2) Groundwater B concentrations ranged from ND to 4.26mg/L, with 24.5% exceeding China's drinking water standard (1.0mg/L, GB5749-2022). High-B groundwater (mainly Cl·SO4-Na·Ca type) exhibited significant spatial heterogeneity, clustering in the Gaochang District downstream of B-bearing river. (3) Groundwater B enrichment originated from mountain rock weathering (dominant source), supplemented by anthropogenic inputs (wastewater/fertilizers), with surface water infiltration being the principal transport pathway. Key controlling processes included pH-dependent speciation, cation exchange, competitive adsorption, dissolution of evaporite, and the mixing, with significant variations between aquifers. (4) The UNMIX model identified four factors: surface water infiltration recharge (36.6%), carbonate-silicate dissolution (21.8%), evaporite dissolution (21.6%), and industrial/agricultural activities (20.0%), with boron primarily originating from surface water infiltration recharge (56.0%). (5) The order of vulnerable segments of the population in terms of risk posed by B in groundwater was: infants > adult men > adult women > children. in the arid region of Northwest China.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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