Department of Land, Air, and Water Resources, 1 Shields Avenue, University of California-Davis, Davis, CA 95616, USA.
Chemosphere. 2010 Mar;78(11):1409-15. doi: 10.1016/j.chemosphere.2009.12.062. Epub 2010 Jan 25.
The presence of iron(III) has long been recognized as a difficulty when ultraviolet absorbance measurements of dissolved organic matter are desired. This interference was studied in water samples of diverse origins and properties, and a procedure is discussed which uses hydroxylamine to reduce up to 10 mg L(-1) (0.18 mM) of Fe(III) to non-interfering Fe(II). This procedure eliminated the effect of Fe(III) in all samples from about 220 to 400 nm, and removed interference down to 200 nm in most samples.
当需要测量溶解有机物的紫外吸光度时，三价铁的存在一直被认为是一个难题。本研究对来源和性质各异的水样进行了这种干扰的研究，并讨论了一种使用羟胺将高达 10 毫克/升（0.18 毫摩尔）的 Fe(III)还原为非干扰性 Fe(II)的方法。该方法消除了所有样品中约 220 至 400nm 处 Fe(III)的影响，并在大多数样品中消除了低至 200nm 的干扰。
