Sensitive Gas Chromatography Detection of Nanomolar Hydroxylamine in Environmental Water by Fe(III) Oxidation
Sensitive Gas Chromatography Detection of Nanomolar Hydroxylamine in Environmental Water by Fe(III) Oxidation
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DOI：
10.2116/analsci.20p254
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发表时间：
2021-02-01
影响因子：
1.6
通讯作者：
Seike, Yasushi
中科院分区：
文献类型：
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作者：
Hikino, Aiko;Sugahara, Shogo;Seike, Yasushi
采用Fe 3+氧化法测定了天然水源中NH 2 OH的纳摩尔浓度。使用2.35 - 2.50的pH值，通过添加氯乙酸盐缓冲液进行调节。将等量（1.0 mL）的氯乙酸盐溶液和氯化铁溶液加入到水样品（70 mL）中以将NH 2 OH氧化成N2 O。然后，使用气相色谱仪与电子捕获检测器（ECD），其中的检测限为0.2 μ gN L-1（14 nmol L-1），通过顶空分析定量样品水中产生的N2 O。该方法已成功应用于淡水、微咸水和海水样品，尽管盐度不同，但未观察到干扰物质。此外，NH 2 OH被成功地检测到从比伊河和新治湖和中海湖（岛根县，日本）收集的样本。此外，该方法也适用于富含浮游植物有机物的样品。
Nanomolar concentrations of NH2OH in natural water sources were determined using an Fe3+ oxidation method. A pH of 2.35 - 2.50 was used, which was adjusted by adding a chloroacetate buffer. Equal amounts (1.0 mL) of the chloroacetate solution and ferric chloride solution were added to the water sample (70 mL) to oxidize NH2OH to N2O. The resulting N2O in the sample water was then quantified by headspace analysis using a gas chromatograph with an electron-capture detector (ECD), where a limit of detection of 0.2 mu gN L-1 (14 nmol L-1) was achieved. This method was successfully applied to samples of freshwater, brackish water, and seawater, and despite the various salinities no interfering substances were observed. Furthermore, NH2OH was successfully detected in samples collected from the Hii River and Lakes Shinji and Nakaumi (Shimane Prefecture, Japan). In addition, the proposed method was also applicable to samples rich in organic substance derived from phytoplankton.