Saarela K E, Harju L, Lill J O, Rajander J, Lindroos A, Heselius S J
Laboratory of Analytical Chemistry, Abo Akademi University, FIN-20500 Turku, Finland.
Talanta. 2000 Apr 3;51(4):717-25. doi: 10.1016/s0039-9140(99)00326-4.
Plant materials were dry ashed at 550 degrees C and analysed using particle-induced prompt gamma-ray emission (PIGE). The analyses were performed with an external beam of 3 MeV protons incident on the target. Seven biological certified reference materials were analysed and used for the evaluation of the method for Na, Mg, Al, P and Mn. The elemental concentration to detection limit ratios were greatly enhanced by dry ashing of the biological materials. The concentrations of the elements in ashes were clearly above the values at which reliable analyses can be made. The method was applied to samples of spruce and pine. Due to the low ash content of the wood samples, the sensitivity of the method was radically improved. The detection limits for the five elements studied in spruce wood were in the range 0.014-2.5 mug g(-1). The set-up and the beam current used enabled simultaneous particle-induced X-ray emission spectrometry (PIXE) analyses, with the sensitivity optimised for heavier trace elements.
将植物材料在550摄氏度下进行干灰化处理，并使用粒子诱导瞬发伽马射线发射（PIGE）进行分析。分析是用能量为3兆电子伏的质子外束照射靶材来进行的。对七种生物认证参考物质进行了分析，并用于评估钠、镁、铝、磷和锰的分析方法。通过对生物材料进行干灰化处理，元素浓度与检测限的比值大大提高。灰分中元素的浓度明显高于能够进行可靠分析的值。该方法应用于云杉和松树的样本。由于木材样本的灰分含量较低，该方法的灵敏度得到了极大提高。云杉木中所研究的五种元素的检测限在0.014 - 2.5微克/克（-1）范围内。所采用的装置和束流使得能够同时进行粒子诱导X射线发射光谱法（PIXE）分析，且对较重痕量元素的灵敏度进行了优化。
