Quantifying hydrogen peroxide in iron-containing solutions using leuco crystal violet.

Quantifying hydrogen peroxide in iron-containing solutions using leuco crystal violet.
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DOI:
10.1186/1467-4866-6-47
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发表时间:
2005
影响因子:
2.3
通讯作者:
Schoonen MA
Schoonen MA
中科院分区:
地球科学3区
文献类型:
--
作者:
Cohn CA;Pak A;Strongin D;Schoonen MA

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过氧化氢存在于许多天然沃茨和废水沃茨中。在Fe(II)的存在下,该物种分解形成羟基自由基,其具有极强的反应性。因此,在Fe(II)的存在下,过氧化氢由于其短寿命而难以检测。在这里,我们展示了一个扩展的使用过氧化氢的定量技术,使用无色结晶紫(LCV)的不同pH值和铁浓度的解决方案。在生物催化剂过氧化物酶的存在下,LCV被过氧化氢氧化,形成有色结晶紫离子(CV+),其可稳定数天。LCV方法使用标准设备,并允许在低μ M浓度水平下进行检测。结果显示强烈的pH依赖性,最大LCV氧化在pH 4.23。通过EDTA螯合溶解的Fe(II),可以稳定过氧化氢用于分析。结果呈现为黄铁矿-水浆料中的过氧化氢定量。黄铁矿-水浆料仅在EDTA存在下显示出过氧化氢的表面积依赖性生成,EDTA螯合溶解的Fe(II)。鉴于CV+的稳定性,该方法特别适用于涉及过氧化氢检测的现场工作。
Hydrogen peroxide is present in many natural waters and wastewaters. In the presence of Fe(II), this species decomposes to form hydroxyl radicals, that are extremely reactive. Hence, in the presence of Fe(II), hydrogen peroxide is difficult to detect because of its short lifetime. Here, we show an expanded use of a hydrogen peroxide quantification technique using leuco crystal violet (LCV) for solutions of varying pH and iron concentration. In the presence of the biocatalyst peroxidase, LCV is oxidized by hydrogen peroxide, forming a colored crystal violet ion (CV+), which is stable for days. The LCV method uses standard equipment and allows for detection at the low microM concentration level. Results show strong pH dependence with maximum LCV oxidation at pH 4.23. By chelating dissolved Fe(II) with EDTA, hydrogen peroxide can be stabilized for analysis. Results are presented for hydrogen peroxide quantification in pyrite–water slurries. Pyrite–water slurries show surface area dependent generation of hydrogen peroxide only in the presence of EDTA, which chelates dissolved Fe(II). Given the stability of CV+, this method is particularly useful for field work that involves the detection of hydrogen peroxide.
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