The effect of natural CO₂ leakage through water wells on groundwater chemistry from alluvial aquifers of Hamadan, Iran, has been investigated through analysis of water samples from 5 springs and 19 wells. The average CO₂ partial pressure in gas charged groundwater has increased about 32 times with respect to background groundwater, leading to an increase in alkalinity and in the concentration of all ions, except for SO₄, and to a decrease in pH and DO. Due to a high pH buffering capacity, pH of gas charged groundwater has decreased only one unit. The increase in salinity of the gas charged groundwater cannot be attributed to in situ weathering of aquifer materials because of (1) the lack of correlation between DIC vs δ¹³C_DIC and TDS vs pH, (2) the high concentration of SiO₂ and F and (3) the ⁸⁷Sr/⁸⁶Sr ratio in the range from 0.7085 to 0.7118. Instead, it can be attributed to saline CO₂-rich waters from deep sources, which can dissolve a variety of minerals during their migration towards the surface. Although it is not clear the role of CH₄ as electron donor, the association of δ¹⁸O_SO4 and δ³⁴S_SO4 with SO₄ concentration suggests that sulfate reduction could occur in the environment. The salinity of Mesozoic gas-rich springs, which present higher CO₂ pressure and lower pH, is five times lower than that of Cenozoic ones because of the different degrees of metamorphism, which lead to an increase in grain size and slower reaction rate in Mesozoic than in Cenozoic carbonate rocks.

通过分析来自5个泉水和19口井的水样，研究了自然的CO ₂泄漏通过水井对伊朗哈马丹冲积含水层地下水化学的影响。含气地下水中的平均CO ₂分压是背景地下水的32倍，导致碱度和所有离子（SO ₄除外）的浓度增加，pH和DO降低。由于具有较高的pH缓冲能力，充气的地下水的pH仅下降了一个单位。在气体带电地下水盐度的增加不能归因于的，因为（1）缺乏DIC之间的相关性的含水层材料的原位风化VSδ ¹³ C ^_DIC和TDS与pH的关系，（2）高浓度的SiO ₂和F，以及（3）⁸⁷ Sr / ⁸⁶ Sr之比，范围为0.7085至0.7118。相反，它可以归因于来自深层来源的富含CO _2的盐水，在其向地面迁移的过程中可以溶解多种矿物质。尽管目前尚不清楚CH的作用₄为电子给体，δ协会¹⁸ ö _SO4和δ ³⁴小号_SO4与SO ₄浓度表明，硫酸盐还原可能发生在环境中。中生代富气弹簧的盐度，其CO ₂较高 由于变质程度不同，压力和较低的pH值是新生代的5倍，这导致中生代的粒度增加，反应速率比新生代碳酸盐岩慢。