摘要
研究了离子强度、不同金属离子对土壤中PAHs表观解吸水平的影响.根据Pearson原理计算了菲、荧蒽、芘和苯并[k]荧蒽等几种PAHs的碱性特征参数并据此分析了其酸碱性类型.结果表明:实验条件下,解吸液中离子强度并非影响土壤中PAHs解吸的控制要素;不同硬度酸性金属离子与PAHs之间的酸碱作用是影响土壤中PAHs解吸水平变化的关键.硬酸性金属离子Ba2+、Al3+、Ca2+对土壤中PAHs的解吸具有促进作用,软酸性离子Hg2+、Ag+则具有抑制作用,比较而言交界酸性金属离子Cu2+、Fe2+、Zn2+在提高土壤中PAHs解吸上作用更加明显.
Effects of ion strength and ion types on desorption of polycyclic aromatic hydrocarbons（PAHs） were examined.Based on Pearson principle,the basic characteristics of phenanthrene（PHE）,fluoranthene（FLU）,pyrene（PYR） and benzo[k]fluoranthene（B[k]Fl） were calculated to determine their acidic-basic types.The experimental results indicated that ion strength was not the key controlling factor on PAHs desorption.The acidic-basic interaction between metallic ions with different hardness and PAHs was the key influencing point on the PAHs desorption level variation from the contaminated soil.Hard acidic metallic cations,such as Ba^2＋,Al^3＋ and Ca^2＋,can expedite PAHs desorption.In contrast,acidic cations,such as Hg^2＋ and Ag^＋,played an inhibition role.The borderline acidic cations,such as Cu2＋,Fe^2＋ and Zn^2＋,can enhance PAHs desorption more significantly.
出处
《环境科学学报》
CAS
CSCD
北大核心
2012年第7期1708-1716,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金-英国皇家协会联合基金(No.40873076
40910262)~~
关键词
金属离子
硬度
软硬酸碱
多环芳烃
解吸
metallic cations
hardness
hard-soft acid and base
polycyclic aromatic hydrocarbons
desorption
