佛山东部地下水酞酸酯分布特征及其成因探讨

 为了解佛山东部地下水中酞酸酯(PAEs)的分布情况，于2005-2007年在该地区采集了69组地下水样和12组地表水样，用气相色谱 质谱联用技术进行测试。结果显示：地下水PAEs的检出率为59.4%，地下水∑PAEs（6种PAEs的总和）的浓度在未检出～7.6μg/L之间。6种PAEs中仅邻苯二甲酸双(2-乙基己基)酯(DEHP)和邻苯二甲酸二正丁酯(DnBP)两种有检出，无PAEs超标。地下水PAEs主要分布于研究区的中心区，部分出现于南部，北部未见PAEs检出；地下水PAEs的检出以单种检出为主。地表水和地下水中均以检出DnBP和DEHP这两种PAEs为主，地表水检出PAEs的含量明显高于地下水中PAEs的含量。环境中废弃的塑料制品所释放的PAEs以及含PAEs地表废水的下渗均为该地区地下水PAEs的重要来源。影响该地区地下水PAEs含量的因素有PAEs的使用总量、各种PAEs的物理化学性质、地下水中的微生物及其生存环境以及土地利用状况等。

Characteristics and Origin of Phthalic Acid Esters in Groundwater at Eastern Foshan, Guangdong

In order to find out the distribution characteristics of phthalic acid esters (PAEs) in groundwater, which include dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DnBP), butyl benzyl phthalate (BBP), bis(2-ethylhexyl) phthalate (DEHP), and di-n-octyl phthalate (DnOP), sixty nine groups of groundwater samples and 12 groups of surface water samples collected from the east area of Foshan during 2005 to 2007 were tested by gas chromatography and mass spectrum. The results show that the detection rate of PAEs is 59.4% in groundwater, and the total PAEs concentration is lower than 7.6 μg/L. Of 6 kinds of PAEs, only DEHP and DnBP have been detected. The PAEs concentrations in groundwater do not exceed the standard. Most samples with PAEs are distributed in the centre of research area. Most groundwater samples contain one kind of PAEs, only some samples have two kinds of PAEs. DnBP and DEHP are the dominating PAEs in groundwater and surface water, and PAEs concentrations in surface water are higher than those in groundwater. PAEs released from abandoned plastic products in environment and infiltrated from the surface are important sources of PAEs in groundwater at eastern Foshan area. Factors affecting the PAEs concentration of groundwater in eastern Foshan area include the total use of PAEs, the physicochemical properties of PAEs, microorganisms and their living conditions in groundwater, and land use status,etc.