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锂铷铯的电离电位较低,在火焰中被离解为中性原子(M)之后,还要进一步电离为正离子(M~+)和自由电子(e):MM~++e。电离反应的结果,减少了中性原子数目,因而减少了单位体积内参与原子吸收的基态原子总数和参与原子发射的激发态原子总数。使吸收值和发射强度降低,导致灵敏度下降,这就是众所周知的电离干扰。当影响电离平衡的因素存在时,电离的程度将发生变化,中性原子数目随之改变,吸收和发射信号也改变。因此用火焰原予吸收法和火焰分光光度法测定锂铷铯时,首先要考虑电离干扰并设法减小或消除其影响。对此,已有许多资料报导。
Lithium rubidium cesium ionization potential is lower, in the flame is dissociated into neutral atoms (M), but also further ionization of positive ions (M ~ +) and free electrons (e): MM ~ + + e. As a result of the ionization reaction, the number of neutral atoms is reduced, thereby reducing the total number of ground state atoms participating in atomic absorption per unit volume and the total number of excited state atoms participating in atomic emission. So that the absorption value and emission intensity decreased, resulting in decreased sensitivity, which is well-known ionization interference. When the factors that affect the ionization balance exist, the degree of ionization will change, the number of neutral atoms will change, and the absorption and emission signals will also change. Therefore, the original flame absorption method and flame spectrophotometric determination of lithium rubidium cesium, we must first consider the ionization interference and try to reduce or eliminate its impact. In this regard, a lot of information has been reported.