Potential of Far-Ultraviolet Absorption Spectroscopy as a Highly Sensitive Quantitative and Qualitative Analysis Method for Aqueous Solutions, Part I: Determination of Hydrogen Chloride in Aqueous Solutions
Potential of Far-Ultraviolet Absorption Spectroscopy as a Highly Sensitive Quantitative and Qualitative Analysis Method for Aqueous Solutions, Part I: Determination of Hydrogen Chloride in Aqueous Solutions
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远紫外吸收光谱作为水溶液高灵敏度定量和定性分析方法的潜力，第一部分：水溶液中氯化氢的测定
DOI：
10.1366/0003702041655331
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发表时间：
2004
影响因子：
3.5
通讯作者：
Y. Ozaki
中科院分区：
文献类型：
--
作者：
N. Higashi;Y. Ozaki
本文报道了远紫外（FUV）吸收光谱在水溶液的高灵敏度定量和定性分析中的有用性。我们提出了在纯水和水溶液分析中使用 FUV 光谱的全新想法。由于水的 n → σ* 跃迁，我们使用 170 nm 附近的吸收带。使用普通紫外可见分光光度计可以在 190-210 nm 区域观察到该波段底部的强度，该强度对水的水合和氢键的变化非常敏感。为了展示 FUV 光谱在分析化学中的潜力，我们进行了三种实验。第一个是对八种商业天然矿泉水的歧视。无需任何光谱预处理或多变量分析等光谱分析，即可从 190-250 nm 区域的光谱图直接区分这 8 种矿泉水。第二个实验是测定水溶液中的氯化氢（HCl）。测量了浓度为 0–20 ppm 的 HCl 水溶液的 FUV 光谱。基于 193 nm 处的吸光度，开发了用于预测水溶液中 HCl 浓度的校准模型。该方法不需要任何光谱预处理或多变量分析。所开发的校准模型的相关系数和预测标准误差分别为0.9987和0.18 ppm。该提议方法测定水溶液中 HCl 的检测限估计为 0.5 ppm (13.7 μM)。还尝试了人工添加2、4、6、8、12、16和20 ppm HCl溶液的天然矿泉水的HCl测定。第三项研究是测定含有 NH3 和 H2O2 的水溶液中的氨 (NH3) 和过氧化氢 (H2O2)。已经发现本方法对于双组分系统的测定也是有用的。
This paper reports the usefulness of far-ultraviolet (FUV) absorption spectroscopy in highly sensitive quantitative and qualitative analysis of aqueous solutions. We propose a totally new idea for the utilization of FUV spectroscopy in pure water and aqueous solution analyses. We use an absorption band near 170 nm due to an n → σ* transition of water. The intensity of the foot of this band, which can be observed in the 190–210 nm region by use of an ordinary ultraviolet–visible (UV-Vis) spectrometer, is very sensitive to changes in hydration and hydrogen bonds of water. To demonstrate the potential of FUV spectroscopy in analytical chemistry, we undertook three kinds of experiments. The first one is concerned with the discrimination of eight kinds of commercial natural mineral water. The eight kinds of mineral water can be discriminated straightforwardly from the spectral patterns in the 190–250 nm region without any spectral pretreatment or spectral analysis such as multivariate analysis. The second experiment is the determination of hydrogen chloride (HCl) in aqueous solutions. FUV spectra of aqueous solutions of HCl over a concentration of 0–20 ppm were measured. A calibration model for predicting the concentration of HCl in the aqueous solutions was developed based on the absorbance at 193 nm. This method does not require any spectral pretreatment or multivariate analysis. The correlation coefficient and standard error of prediction of the calibration model developed are 0.9987 and 0.18 ppm, respectively. The detection limit of the proposal method for the determination of HCl in aqueous solutions was estimated to be 0.5 ppm (13.7 μM). The determination of HCl was also tried for natural mineral water to which HCl solutions with the concentrations of 2, 4, 6, 8, 12, 16, and 20 ppm were artificially added. The third study was the determination of ammonia (NH3) and hydrogen peroxide (H2O2) in aqueous solutions containing both NH3 and H2O2. It has been found that the present method is also useful for the determination of the two-component system.