Putschew Anke, Keppler Frank, Jekel Martin
Department of Water Quality Control, Institute for Environmental Technology, Technical University of Berlin, Strasse des 17. Juni 135, Sekr. KF 4, 10623 Berlin, Germany.
Anal Bioanal Chem. 2003 Mar;375(6):781-5. doi: 10.1007/s00216-003-1797-1. Epub 2003 Feb 25.
The proposed method for the differential AOX analysis of water samples was tested for its applicability to differentiate the halogen content of peat samples. For determination of the total and the total organic-bound chlorine, bromine and iodine, peat samples were combusted, and the combustion gases trapped and analyzed by ion chromatography (TX/TOX-IC). The total and the organically bound chlorine, bromine and iodine, respectively, can be determined by two-fold analysis with deviations of around 10%. With respect to chlorine more than a double determination could be required. The limit of quantification is 20 mg kg(-1) for chlorine, 2 mg kg(-1) for bromine and 1 mg kg(-1) for iodine, if 25 mg of peat is combusted. The most crucial step of the analysis is the inorganic halogen removal, which is necessary if the organically bound fraction is determined. However, there are some uncertainties about the complete removal of the inorganic halides from the solid samples. Thus, the values of the organically bound fraction have to be discussed as maximal concentrations. Nevertheless, we suggest that the applied method can be useful as a tool for studying the fate of halogens in soils.
所提出的用于水样中差示AOX分析的方法，针对区分泥炭样品中卤素含量的适用性进行了测试。为了测定总氯、总有机结合氯、溴和碘，将泥炭样品燃烧，燃烧气体捕集后通过离子色谱法（TX/TOX-IC）进行分析。通过两次分析分别测定总氯、有机结合氯、溴和碘，偏差约为10%。对于氯，可能需要进行两倍以上的测定。如果燃烧25mg泥炭，氯的定量限为20mg kg⁻¹，溴为2mg kg⁻¹，碘为1mg kg⁻¹。分析中最关键的步骤是无机卤素的去除，这在测定有机结合部分时是必要的。然而，从固体样品中完全去除无机卤化物存在一些不确定性。因此，有机结合部分的值必须作为最大浓度来讨论。尽管如此，我们认为所应用的方法可作为研究土壤中卤素归宿的一种有用工具。
