Harnly J M
Agricultural Research Service, Beltsville Human Nutrition Research Center, Food Composition Laboratory, US Department of Agriculture, Building 161, BARC-East, 20705, Beltsville, MD, USA.
Anal Bioanal Chem. 1996 Jun;355(5-6):501-9. doi: 10.1007/s0021663550501.
Graphite furnace-atomic absorption spectrometry (GF-AAS) is restricted to the determination of 4 to 6 elements simultaneously due to the limitations of hollow cathode lamps. However, a consideration of prototype continuum source instruments and recent advances in the fields of spectrometer and detector technology suggests that a multielement GF-AAS instrument, with the multielement versatility associated with atomic emission spectrometry, is possible. Such a multielement instrument would employ a continuum source and provide 1.) multielement determinations for 30 to 40 elements, 2.) wavelength and time integrated absorbance measurements which are independent of the source width, 3.) detection limits comparable to line source AAS with the potential for another order of magnitude improvement using atomization at elevated pressures, 4.) extended calibration ranges limited only by the memory of the atomizer, and 5.) high resolution inspection of the spectra surrounding the analytical wavelength. Such an instrument could provide figures of merit comparable to inductively coupled plasma-mass spectrometer with considerably less complexity.
由于空心阴极灯的局限性，石墨炉原子吸收光谱法（GF-AAS）仅限于同时测定4至6种元素。然而，对原型连续光源仪器以及光谱仪和探测器技术领域的最新进展进行考量后表明，具备与原子发射光谱法相关的多元素通用性的多元素GF-AAS仪器是有可能实现的。这样一种多元素仪器将采用连续光源，并具备以下特性：1. 可对30至40种元素进行多元素测定；2. 进行与光源宽度无关的波长和时间积分吸光度测量；3. 检测限与线光源原子吸收光谱法相当，通过在高压下进行原子化还有可能再提高一个数量级；4. 校准范围的扩展仅受原子化器记忆效应的限制；5. 对分析波长周围的光谱进行高分辨率检测。这样一台仪器能够提供与电感耦合等离子体质谱仪相当的性能指标，且复杂度要低得多。
