为了确定南宁市清水泉岩溶地下水中多环芳烃的组成、来源及污染特征, 沿该地下河上游、中游、下游布设5 个采样点。经过采样送检, 检测了16 种优控多环芳烃( PAH s) 。结果表明, 丰水期地下水中2 PAH s( PAHs 总量) 浓度为163. 87~ 209. 96 ng/ L, 平均值为183. 10 ng/ L, 以2 环和3 环的PAHs 物质( 萘、菲和荧蒽) 为主, 约占总量 的52%。丰水期、平水期和枯水期的清水泉地下水中, PAH s 浓度整体上分布规律为: 上游< 中游< 下游, 浓度增 大的主要原因是沿途污染源的不断汇入。地下水中2 环和3 环PAH s、4 环PAH s、5 环和6 环PAH s、PAH s 总量 的季节性浓度变化整体上呈现出相同的变化规律, 即枯水期> 平水期> 丰水期, 这与PAH s 的物理化学性质有关。 PAHs 来源分析表明, 研究区下游地区PAHs 来源为石油, 中上游地区来自燃料的高温燃烧。与其他地区比较, 清 水泉地下水虽然出现了PAH s 污染, 但污染程度较低。

To determine the compo nents, source, and po llution character istics o f Polycyclic Ar omatic Hy drocar bo ns( PAHs) in the kar st gr oundwat er of Qingshui Spr ing, five sampling points w ere set along the upstream, midst ream, and dow nstr eam of the riv er, and 16 pr ior ity PAH s w ere detected. T he r esults show ed t hat ( 1) the t otal PAHs concentr atio n in the w et seaso n is 1631 87~ 2091 96 ng/ L w it h an aver age value o f 1831 10 ng / L, and 2~ 3 r ing naphtha lene, fluoranthene, phenanthrene account for 52% o f the total PAH s; ( 2) t he downstream of Qingshui Spring has the hig hest PAH s concentr atio n in t he dr y, no rmal, and wet seasons, followed by the midstr eam, and the upstr eam has the low est, w hich , is caused by the continually incr eased pollu2 tion source alo ng the riv er; ( 3) the of 2~ 3 r ing PAH s, 4 ring PAH s, 5~ 6 ring PAH s, and total PAH s concentr ations ar e the highest in the dr y seaso n and low est in the w et season, which is related to t he physicochemical pro per ties of PAH s; and( 4) the PAHs so ur ce is petr oleum in t he downstream and fuel combustion in the upper and middle streams. Compar ed to other reg io ns, the PAHs pollutio n level o f the kar st gr oundw ater in Qingshui Spr ing is low .

中国地质调查局地质调查项目( 1212011121164) ; 岩溶地质研究所基本科研业务费项目( 201309)