Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Sturlugata 7, 101 Reykjavik, Iceland.
Talanta. 2011 Sep 30;85(4):1897-903. doi: 10.1016/j.talanta.2011.07.024. Epub 2011 Jul 23.
Analytical methods have been developed to determine sulfur species concentrations in natural geothermal waters using Reagent-Free™ Ion Chromatography (RF™-IC), titrations and spectrophotometry. The sulfur species include SO(4)(2-), S(2)O(3)(2-), and ∑S(2-) with additional determination of SO(3)(2-) and S(x)O(6)(2-) that remains somewhat semiquantitative. The observed workable limits of detections were ≤ 0.5 μM depending on sample matrix and the analytical detection limits were 0.1 μM. Due to changes in sulfur species concentrations upon storage, on-site analyses of natural water samples were preferred. Alternatively, the samples may be stabilized on resin for later elution and analysis in the laboratory. The analytical method further allowed simultaneous determination of other anions including F(-), Cl(-), dissolved inorganic carbon (DIC) and NO(3)(-) without sample preservation or stabilization. The power of the newly developed methods relies in routine analysis of sulfur speciation of importance in natural waters using techniques and facilities available in most laboratories doing water sample analysis. The new methods were successfully applied for the determination of sulfur species concentrations in samples of natural and synthetic waters.
已经开发出了使用无试剂离子色谱（RF-IC）、滴定和分光光度法来测定天然地热水中硫物种浓度的分析方法。这些硫物种包括 SO(4)(2-)、S(2)O(3)(2-)和∑S(2-)，并可进一步测定 SO(3)(2-)和 S(x)O(6)(2-)，但后者的测定结果仍有些半定量。根据样品基质的不同，观察到的可检测限为 ≤ 0.5 μM，分析检测限为 0.1 μM。由于储存过程中硫物种浓度会发生变化，因此优先进行现场分析天然水样。或者，可以将样品固定在树脂上，以便以后在实验室中洗脱和分析。该分析方法还允许在不进行样品保存或稳定化的情况下，同时测定其他阴离子，包括 F(-)、Cl(-)、溶解无机碳（DIC）和 NO(3)(-)。新方法的优势在于，使用大多数进行水样分析的实验室都具备的技术和设备，可对天然水中具有重要意义的硫形态进行常规分析。新方法已成功应用于测定天然和合成水样中硫物种浓度。
