山东北部滨海平原高氟区地下水硒含量地球化学特征

Groundwater Selenium Content Geochemical Characteristics in High-fluorine Areas Along Coastal Zone of the Southern Shandong Province

硒是影响人体健康的重要生命元素,水中硒和氟含量具有较强的关联性,山东北部滨海平原区地下水氟含量较高,但硒含量地球化学特征尚未有详细的报道。本文选定卜庄镇为研究对象,系统分析了地下水硒含量,结果表明:地下水硒含量为1.43~15.60μg/L,平均值为6.23μg/L,仅王卢村硒含量超过地下水标准(10μg/L),有8个村庄地下水硒含量超过5μg/L。该区除金山村外,地下水氟含量超标,但硒和氟无显著相关性,表明该区地下水硒富集和氟富集动力存在差异。地球化学指标表明该区地下水受到海水入侵浸染,与未受浸染的参照样品相比,该区地下水硒含量明显升高。地下水硒含量与p H无显著相关性,与Fe、溶解固体总量、Cl^-、Br^-、Na^+、Mg^(2+)、SO_4^(2-)显著正相关,海水入侵引起的离子竞争吸附和高的Na-MgSO_4^(2-)矿物是影响该区地下水硒含量变化的重要动力。

Selenium is an important life element affecting human health,and groundwater selenium and fluorine are highly related.The groundwater in the coastal zone of the northern Shandong Province has high fluorine levels,but there is no any detail report about the selenium geochemical characteristics.Buzhuang Town was selected as studied objection,and the groundwater selenium was systemically analyzed.The groundwater had selenium levels of 1.43~15.60μg/L,with the average of 6.23μg/L.Only the selenium level of groundwater in Wanglu village were beyond the limitation,those in eight villages were more than 5μg/L.the fluorine levels were overproofed except that in Jinshan village,and there was no significant correlation between groundwater fluorine and selenium,which indicated the difference between the enrichment dynamics of groundwater selenium and fluorine levels.The geochemical index indicated the groundwater was mixed by seawater,and the groundwater selenium levels were obviously higher than that in village which wasn t mixed by seawater.The groundwater selenium showed no significant correlation with pH,and was significant positively correlated with Fe,TDS,Cl^-、Br^-、Na+、Mg^2+、SO4^2-.The ion completion adsorption and high Na^-Mg^-SO4^2-mineral due to seawater intrusion may be the important dynamics for the variation of groundwater selenium.