%0 Journal Article
%T Characterization of personal exposure concentration of fine particles for adults and children exposed to high ambient concentrations in Beijing, China<br>
%A Xuan Du
%A Qian Kong
%A Weihua Ge
%A Shaojun Zhang
%A Lixin Fu
%A <br>
%J 环境科学学报(英文版)
%D 2010
%I 
%X Batch experiments were carried out to investigate the e ects of initial atrazine concentrations and consecutive desorption steps on the desorption characteristics of atrazine from a sandy loam soil. As initial atrazine concentration increased, the average percentage of atrazine desorption on the sandy loam soil ranged gradually from 23.1% to 38.5% after five consecutive desorption steps. The values of the Freundlich capacity parameter, kdes, derived from the initial concentration and time-dependent desorption isotherm were consistently higher than those associated with sorption. The opposite trend was observed only for the values of nonlinear parameter, ndes, from the initial concentration-dependent desorption isotherms. Atrazine hydrolysis to hydroxyatrazine and bound residue formation were mainly responsible for the observed hysteresis in its sorption and desorption isotherms. For the initial concentration-dependent desorption isotherms, as initial atrazine concentration increased, the values of hysteretic coe cients ! and decreased, and H values increased. However, the relationships between initial atrazine concentration and hysteretic coe cients were not pronounced for !, H, or . For the time-dependent desorption isotherms, and H values increased as the atrazine desorption step proceeded. The correlation between hysteretic coe cient and desorption step was highly significant for (P < 0.0001), but not for H.
%K personal exposure
%K PM2
%K 5
%K high ambient concentration<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=6CB1530875F53489BF1E81BD87B7F5E6&aid=D3A34C32E0E592000F37F60CA23CE09E&yid=140ECF96957D60B2&vid=BC12EA701C895178&iid=708DD6B15D2464E8&sid=43E2C08889D1FABC&eid=961EEFF36C7AED30&journal_id=1001-0742&journal_name=Journalofenvironmentalsciences(China)&referenced_num=1&reference_num=0