骆驼山煤矿不同含水层水中荧光性DOM分布特征

结合骆驼山煤矿不同含水层水文地质条件,通过检测分析各含水层水中天然有机质三维荧光光谱、总有机碳TOC和无机阴离子,研究了荧光性溶解有机物(Dissolved Organic Matter,DOM)的分布特征,结果表明:TOC和有机物在254 mm波长紫外光下的吸光度UV₂₅₄整体上随着含水层层位加深而减少,奥灰水中TOC和UV₂₅₄比其他水体分别低2~3.3倍和2.4~4.7倍;有机物芳香度也逐渐降低,紫外吸光度SUVA值在地表水、第四系水、砂岩水和奥灰水中分别为3.28、2.27、2.24和1.96。地表水和第四系水的三维荧光光谱(3DEEM)图存在5个指纹区域,随着地层层位的加深,水中有机物总体上呈递减趋势,最深层的奥灰水中没有酪氨酸、疏水性有机酸和海洋性腐植酸,而色氨酸的荧光强度比其他水体都高,表明地下水中有机物会反应生成色氨酸类有机物。奥灰水中TOC随着地下水流向逐渐减少(从0.27 mg/L减少至0.22 mg/L);有机物反应生成色氨酸,导致色氨酸FI随着水流而逐渐增加;根据3DEEM光谱图,骆驼山煤矿区奥灰水中有机物比较稳定,能够明显区分出其作为突水水源的特征离子。 

Distribution characteristics of fluorescent dissolved organic matter in different aquifers of Luotuoshan coal mine

Based on hydrogeological conditions of different aquifers in Luotuoshan coal mine, the distribution characteristics of fluorescent dissolved organic matters in Ordovician limestone water were investigated through detection and analysis of three-dimensional fluorescence spectrum (3DEEM), total organic carbon (TOC), UV₂₅₄ and inorganic anions of natural organic matters in water of different aquifers. The results showed that the concentrations of TOC and UV₂₅₄ decreases with the increase of aquifer depth. The concentrations of TOC and UV₂₅₄ in other aquifers were 2~3.3 times and 2.4~4.7 times higher than those in Ordovician limestone. SUVA was 3.28, 2.27, 2.24 and 1.96 in surface water, Quaternary water, sandstone aquifer water and Ordovician limestone water. There were five finger-print areas in 3DEEM of surface water and Quaternary water, and there were not tyrosine, hydrophobic acid and marine humic acids in Ordovician water. Aromatic protein Ⅱ was produced when organic matter reacted, and which made the FI of aromatic proteinⅡbeing higher in Ordovician limestone water than that in other aquifers. The concentration of TOC decreased from 0.27 mg/L to 0.22 mg/L along the direction of groundwater flow in Ordovician limestone water, and the variation of aromatic proteinⅡ was opposite to TOC. According 3DEEM fluorescence spectrum, dissolved organic matter is stable in Ordovician limestone water in Luotuoshan mine, which is obviously characteristic ion to discriminate bursting source of Ordovician water.