Zhu Yanbei, Asakawa Daiki
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8563, Japan.
Anal Chim Acta. 2024 Nov 15;1329:343185. doi: 10.1016/j.aca.2024.343185. Epub 2024 Aug 30.
Aluminium is a mono-isotope element and can be determined by inductively coupled plasma mass spectrometry (ICP-MS). The measurement of aluminium by ICP-MS suffers potential spectral interferences from multiple elements, which make it challenging to ensure the reliability of the results. Fortunately, the availability of tandem quadrupole ICP-MS (i.e. ICP-QMS/QMS) made it possible to measure multiple aluminium related ionic species for analysis. In the present work, on-line generated ozone was introduced as the reaction gas to the ICP-QMS/QMS for the analysis of aluminium.
Multiple ionic species were obtained by using ozone as the cell gas for determination of aluminium by ICP-QMS/QMS. In comparison to oxygen, ozone apparently improved the yield of AlO, AlO, and AlO from the reaction with Al, attributable to the exothermic reactions when ozone was used. Determination of aluminium with these product ions was investigated at multiple radio frequency (RF) power conditions (800 W-1600 W, step 200 W) for the plasma. At low power conditions (800 W and 1000 W), the measurement of each ion suffered notable non-spectral interferences and caused difference in sensitivities by around 20 % between a digested sample of tea leaf powder and a simple aluminium standard solution. Based on a standard addition method, the result of aluminium in a tea leaf powder certified reference material obtained with each product ion (AlO, n = 0 to 3) agreed with the certified value, and independent to the RF power of the plasma.
Due to the endothermic reactions of aluminium ion with ozone, the yields of AlO (n = 1 to 3) were greatly improved. As a results, the use of ozone as a reaction gas for ICP-QMS/QMS permitted the measurement of aluminium by multiple ionic species, AlO (n = 0 to 3), which provide internal-cross-checkable quantitative results for this mono-isotopic element.
铝是一种单同位素元素，可通过电感耦合等离子体质谱法（ICP-MS）进行测定。采用ICP-MS测定铝时，会受到多种元素的潜在光谱干扰，这使得确保结果的可靠性具有挑战性。幸运的是，串联四极杆ICP-MS（即ICP-QMS/QMS）的出现使得测定多种与铝相关的离子物种用于分析成为可能。在本工作中，将在线生成的臭氧作为反应气引入到ICP-QMS/QMS中用于铝的分析。
通过使用臭氧作为池气体，利用ICP-QMS/QMS测定铝，获得了多种离子物种。与氧气相比，臭氧显著提高了AlO、AlO和AlO与铝反应的产率，这归因于使用臭氧时的放热反应。在等离子体的多个射频（RF）功率条件（800 W - 1600 W，步长200 W）下，研究了用这些产物离子测定铝的情况。在低功率条件（800 W和1000 W）下，每种离子的测量都受到显著的非光谱干扰，并且导致茶叶粉消化样品和简单铝标准溶液之间的灵敏度差异约为20%。基于标准加入法，用每种产物离子（AlO，n = 0至3）获得的茶叶粉有证标准物质中铝的结果与认定值一致，且与等离子体的RF功率无关。
由于铝离子与臭氧的吸热反应，AlO（n = 1至3）的产率得到了极大提高。因此，使用臭氧作为ICP-QMS/QMS的反应气允许通过多种离子物种AlO（n = 0至3）测定铝，这为这种单同位素元素提供了内部可交叉核对的定量结果。
