CAJ | 학술논문

以芘为PAHs代表物,采用土壤粒径分级和PAHs连续提取方法,研究了老化4周污染黄棕壤中芘在不同粒径组分中的形态分布.结果表明,供试土壤中芘主要以有机溶剂提取态和可脱附态存在,结合态残留量所占比例甚小;细砂粒、粉粒、粗黏粒和细黏粒中芘残留占原土总残留的比例分别为6.00%、4.66%、34.68%和40.88%.各粒径组分中各形态芘含量大小顺序为有机溶剂提取态>可脱附态>结合态,有机溶剂提取态和可脱附态是各粒径组分中芘残留的主要存在形态(占比98.82%以上),芘结合态残留量占比<1.18%.土壤中黏粒(包括细黏粒和粗黏粒)是芘可脱附态、有机溶剂提取态、结合态和可提取态残留储存的主要粒径组分.
이비위PAHs대표물,채용토양립경분급화PAHs련속제취방법,연구료노화4주오염황종양중비재불동립경조분중적형태분포.결과표명,공시토양중비주요이유궤용제제취태화가탈부태존재,결합태잔류량소점비례심소;세사립、분립、조점립화세점립중비잔류점원토총잔류적비례분별위6.00%、4.66%、34.68%화40.88%.각립경조분중각형태비함량대소순서위유궤용제제취태>가탈부태>결합태,유궤용제제취태화가탈부태시각립경조분중비잔류적주요존재형태(점비98.82%이상),비결합태잔류량점비<1.18%.토양중점립(포괄세점립화조점립)시비가탈부태、유궤용제제취태、결합태화가제취태잔류저존적주요립경조분.
Polycyclic aromatic hydrocarbons (PAHs), a group of persistent organic pollutants with high toxic properties, have been found in soil with high concentrations all over the world. However, the forms of PAHs in different particle-size fractions of soils have never been clarified heretofore. Here, the forms of pyrene as a representative PAH in different particle-size fractions of a yellow-brown soil were fractionated. Four soil fractions with different particle-size were obtained including fine sand (50~250 μm), silt (5~50 μm), coarse clay (1~5 μm), and fine clay (0.1~1 μm). Pyrene in each particle fraction was sequentially fractionated into three forms including desorbing fraction, non-desorbing fraction and bound residue. Pyrene was found to dominantly present as desorbing fraction and non-desorbing fraction in test soil. 6.00%, 4.66%, 34.68% and 40.88% of pyrene was found in fine sand, silt, coarse clay and fine clay, respectively. The concentrations of each form of pyrene in every particle-size fraction were in the order of non-desorbing fraction > desorbing fraction > bound residue. Non-desorbing and desorbing fraction were the dominant forms of pyrene in test particles, while bound residue contributed less than 1.18% to the total contents of pyrene in each particles with different particle-size. Clays (coarse and fine clays) were the dominant sink of pyrene in soil irrespective of soil desorbing fraction, non-desorbing fraction, bound residue and extractable fraction. Results of this work benefited the understanding of PAH sink in soil, and would be valuable for PAH risk assessment and pollution controls in the soil environment.