废弃钻井液重金属检测及其污染性评价

Detection and evaluation of heavy metal in abandoned drilling fluid

研究了石油钻井产生大量的废弃钻井液对大气、土壤、地面水和地下水的潜在污染.根据鄂尔多斯盆地产油区地质特点,调查取样15个,参照GB5085.3-2007(危险废物鉴别标准)建立了最佳微波消解条件,并对不同样品的重金属含量进行测定,以评价该地区废弃泥浆的重金属污染程度.结果表明,国家规定检测的重金属在15个样品中均有检出,但含量相对较低,均未超过国家规定的限值,属于轻微生态危害水平,对环境危害较小;并且所检测到的重金属汞(Hg)、砷(As)、铬(Cr)、硒(Sn)的含量呈现明显的地域差别.

In order to investigate the potential pollution of abandoned drilling fluid for the atmosphere,soil,surface water and ground water,fifteen samples were selected according to the geological characteristics of oil field in Ordos Basin.The optimum microwave digestion condition to treat sample was obtained,and the heavy metals content in different samples was measured.The results showed that all specified heavy metals were detected but the levels were too low to be harmful to the entironment.The contents of Hg,As,Cr and Sn showed obviously a geographic variation.