【作者】 C.Zaccone； C.Cocozza； V.D’Orazio； C.Plaza； A.Cheburkin； T.M.Miano； 谢绿武； 赵红艳； 王升忠；

【Author】 C.Zaccone~1,C.Cocozza~1,V.D’Orazio~1,C.Plaza~2,A.Cheburkin~3,T.M.Miano~1 Xie Lvwu~4,Zhao Hongyan~4,Wang Shengzhong~4 (1 Dipartimento di Biologia e Chimica Agro-Forestale ed Ambientale,Universit’a degli Studi di Bari, Via Amendola 165/A,70126 Bari,Italy 2 Centro de Ciencias Medioambientales,Consejo Superior de Investigaciones Cientificas, Serrano 115 dpdo.,28006 Madrid,Spain 3 Institute of Environmental Geochemistry,University of Heidelberg, Im Neuenheimer Feld 236,69120 Heidelberg,Germany 4 College of Urban and Environment Sciences,Northeast Normal University,Changchun,130024)

【机构】 Dipartimento di Biologia e Chimica Agro-Forestale ed Ambientale,Universit’a degli Studi di Bari,Via Amendola 165/A,70126 Bari,Italy； Centro de Ciencias Medioambientales,Consejo Superior de Investigaciones Cientificas,Serrano 115 dpdo.,28006 Madrid,Spain； Institute of Environmental Geochemistry,University of Heidelberg,Im Neuenheimer Feld 236,69120 Heidelberg,Germany； 东北师范大学城市与环境科学学院；

【摘要】 氢氧化钠（NaOH）和焦磷酸钠（Na₄P₂O₇）是最常用的、将腐植酸从陆相环境分离出来的2种萃取剂。为了评价萃取剂对HA性质和微量元素的影响,本文采用3种不同溶液,即（a）0.5mol/L NaOH;（b）0.1mol/L Na₄P₂O₇;（c）0.5mol/L NaOH+0.1mol/L Na₄P₂O₇,从5个藓类泥炭样品中分离HA,分析萃取得到HA的灰分含量、元素组成和主要原子比,以及傅立叶变换红外光谱（FT-IR）和发光光谱特征。此外,用X射线荧光法测定泥炭样品和HA中的Br、Cu、Fe、Ni、Pb和Zn的含量。结果表明,用NaOH和NaOH+Na₄P₂O₇萃取的HA,在灰分含量、元素含量和光谱特征上十分相似,而Na₄P₂O₇溶液则降低了萃取率,可能是其影响了HA的性质,使之具有更加复杂的芳香性特征。与原泥炭样品比较,不论哪种萃取剂萃取得到的HA,其Br、Cu和Ni含量均增加,Fe、Pb和Zn含量减少;但相比于其他两种方法,用Na₄P₂O₇萃取的HA含有更多的Br、Cu、Ni和Zn,可能是因为芳香性增加的HA分子对这些元素有更强的亲和力。更多还原

【Abstract】 Among several extractants used to isolate humic acids（HA）from terrestrial environments,sodium hydroxide（NaOH）and sodium pyrophosphate（Na₄P₂O₇）are the most utilized.In order to evaluate the influence of these different extractant solutions on the HA quality and on their trace elements content,HA were isolated from five Sphagnum -peat samples using three different solutions:（a）0.5 mol/L NaOH;（b）0.1 mol/L Na₄P₂O₇;（c）0.5 mol/L NaOH + 0.1 mol/L Na₄P₂O₇.The obtained HA have been analyzed with respect to ash content,elemental composition,main atomic ratios and characterized by FT-IR and total luminescence（TL）spectroscopies.In addition,both raw peat and HA have been analyzed using X-ray fluorescence in order to determine the Br,Cu,Fe,Ni,Pb and Zn contents.Results showed that HA extracted with NaOH and NaOH + Na₄P₂O₇ are quite similar with respect to ash,elemental contents and spec- troscopic characteristics,while Na₄P₂O₇ solution,which in general reduces the extraction yield,seems to affect the nature of HA,featuring a more complex and aromatic character.With respect to the contents in the corresponding raw peat samples,the HA fractions were richer in Br,Cu and Ni,regardless of the extractant used,and poorer in Fe,Pb and Zn. Further,Br,Cu,Ni and Zn were more concentrated in HA extracted with Na₄P₂O₇ than in those extracted with NaOH and NaOH + Na₄P₂O₇,probably because of the greater affinity of these elements for these more aromatic humic molecules.更多还原