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Ultra-sensitive determination of inorganic arsenic valence by solution cathode glow discharge-atomic emission spectrometry coupled with hydride generation
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7ja00228a Xiaohong Guo 1, 2, 3, 4, 5 , Xiaoxu Peng 5, 6, 7, 8 , Qing Li 5, 6, 7, 8 , Jiamei Mo 5, 6, 7, 8 , Yiping Du 1, 2, 3, 4, 5 , Zheng Wang 5, 6, 7, 8
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2017-10-25 00:00:00 , DOI: 10.1039/c7ja00228a Xiaohong Guo 1, 2, 3, 4, 5 , Xiaoxu Peng 5, 6, 7, 8 , Qing Li 5, 6, 7, 8 , Jiamei Mo 5, 6, 7, 8 , Yiping Du 1, 2, 3, 4, 5 , Zheng Wang 5, 6, 7, 8
Affiliation
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A simple and ultra-sensitive method for the determination of inorganic arsenic valence was developed by solution cathode glow discharge atomic emission spectrometry (SCGD-AES) coupled with hydride generation (HG). Arsenic was converted into volatile hydrides by the reaction with NaBH4 and HCl, after which they were delivered and subsequently injected into the near-anode region of the SCGD, where they were detected directly by atomic emission spectrometry (AES). The detection limit (DL) for arsenic was improved by four orders of magnitude compared to the single SCGD-AES process. The main operational parameters and sources of potential interference that affect the determination of arsenic were thoroughly studied. Under optimal conditions, the DLs for As(III) and As(V) were both calculated to be 0.3 μg L−1. Repeatability, expressed as the relative standard deviation of the spectral peak height, was 2.5% (n = 11) for a 0.1 mg L−1 arsenic solution. The proposed method was validated by the determination of a certified reference material (NIST SRM 1568a) and was applied to the real rice samples, where the measurement results obtained by the HG-SCGD-AES method were in good agreement with the reference values or values from hydride generation atomic fluorescence spectrometry.
中文翻译：
溶液阴极辉光放电-原子发射光谱-氢化物发生法超灵敏测定无机砷价
通过溶液阴极辉光放电原子发射光谱法（SCGD-AES）结合氢化物发生（HG）的研究，开发了一种测定无机砷价的简单而灵敏的方法。通过与NaBH 4和HCl的反应将砷转化为挥发性氢化物，然后将其释放并注入到SCGD的近阳极区域，然后通过原子发射光谱法（AES）直接对其进行检测。与单一SCGD-AES工艺相比，砷的检出限（DL）提高了四个数量级。彻底研究了影响砷含量测定的主要操作参数和潜在干扰源。在最佳条件下，As（III）和As（V）均被计算为0.3μgL -1。对于0.1 mg L -1砷溶液，重复性表示为光谱峰高的相对标准偏差，为2.5％（n = 11）。所建议的方法通过确定经认证的参考物质（NIST SRM 1568a）进行了验证，并应用于真实的大米样品，通过HG-SCGD-AES方法获得的测量结果与参考值或参考值具有很好的一致性。来自氢化物发生原子荧光光谱法。
更新日期：2017-11-01
中文翻译：
溶液阴极辉光放电-原子发射光谱-氢化物发生法超灵敏测定无机砷价
通过溶液阴极辉光放电原子发射光谱法（SCGD-AES）结合氢化物发生（HG）的研究，开发了一种测定无机砷价的简单而灵敏的方法。通过与NaBH 4和HCl的反应将砷转化为挥发性氢化物，然后将其释放并注入到SCGD的近阳极区域，然后通过原子发射光谱法（AES）直接对其进行检测。与单一SCGD-AES工艺相比，砷的检出限（DL）提高了四个数量级。彻底研究了影响砷含量测定的主要操作参数和潜在干扰源。在最佳条件下，As（III）和As（V）均被计算为0.3μgL -1。对于0.1 mg L -1砷溶液，重复性表示为光谱峰高的相对标准偏差，为2.5％（n = 11）。所建议的方法通过确定经认证的参考物质（NIST SRM 1568a）进行了验证，并应用于真实的大米样品，通过HG-SCGD-AES方法获得的测量结果与参考值或参考值具有很好的一致性。来自氢化物发生原子荧光光谱法。
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