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本文叙述用发射光谱测定空气中悬浮颗粒物里的多种元素的方法。用杂质极微的有机纤维滤膜采集大气中悬浮颗粒物,将其溶于丙酮,为了避免若干待测元素生成易挥发的氯化物而丢失,加入少量高纯的硫酸,使它转化为硫酸盐。冒烟后,置于马福炉450℃灰化。本法采用有效的缓冲剂和戴帽的特殊电极,上下电极同装一个样摄谱,测定易挥发元素;去帽后,分别用其中一根电极,在不同的中心波长摄谱,测定难挥发元素,有效地提高待测元素的灵敏度。 本法的检出限可达10~(-30)—10~(-5)μg/m~3,均方差小于12％,各测定元素的回收率为91—109%。
This article describes a method for the determination of multiple elements in suspended particulate matter in the air by emission spectroscopy. Inorganic impurities with minimal fiber membrane collected particulate matter in the air, dissolved in acetone, in order to avoid the formation of several elements to be tested to generate volatile chloride lost, adding a small amount of high-purity sulfuric acid, making it converted to sulfate. After smoking, placed in a muffle furnace ashed 450 ℃. This method uses an effective buffer and a special electrode wearing a cap, the upper and lower electrodes with a sample, the determination of volatile elements; to the cap, respectively, with one of the electrodes, respectively, at different central wavelength spectroscopy, determination of volatile Element, effectively improve the sensitivity of the element under test. The detection limit of this method can reach 10 ~ (-30) -10 ~ (-5) μg / m ~ 3, the mean square deviation is less than 12%, and the recovery rate of each determination element is 91-109%.