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当样品中存在一定量的以高岭石为主的粘土矿物时,对若干易挥发元素的分析结果将产生不同程度的系统偏差,对铅的影响尤为严重。本文对其作用机理进行了系统的研究,并提出了在电极中加入“缓冲层”物质的方法,以消除上述影响,结果是令人满意的。加罩电极光谱分析方法[1]在勘查地球化学样品的多元素分析中具有灵敏、快速、精度高、成本低等一系列优点。但某些易挥发元素的分析结果容易受到基体存在状态不同的影响。实验表明,当样品存在一定量粘土矿物时,某些易挥发元素的分析结果将出现不同程度的系统偏差,铅所受的影响尤为严重。在加罩电极的燃弧条件下,缓冲剂中比较容易挥发的钠盐与样品中的粘土矿物结合生成挥发性很小的硅铝酸钠,失去了原先钠离子在电弧中的缓冲作用。为此,作者在本文中提出了一种所谓“缓冲层”的方法,以消除上述影响。
When a certain amount of kaolinite-based clay minerals exist in the sample, the analysis results of several volatile elements will produce different degrees of systematic deviations, and the impact on lead is particularly serious. In this paper, the mechanism of action was systematically studied and a method of adding “buffer layer” material to the electrode was proposed to eliminate the above effects. The result was satisfactory. The method of spectral analysis of covered electrodes [1] has many advantages such as sensitivity, rapidity, high precision and low cost in the multi-element analysis of geochemical samples for prospecting. However, the analysis results of some volatile elements are easily affected by the existence of different states of the matrix. Experiments show that when there is a certain amount of clay minerals in the sample, the analysis results of some volatile elements will show different degrees of systematic deviation, and the impact of lead is particularly serious. Under the arcing condition, the relatively volatile sodium salt in the buffer combines with the clay minerals in the sample to produce low-volatile sodium aluminosilicate, which loses the buffer effect of the original sodium ions in the arc. For this reason, the author proposed a so-called “buffer layer” method in this paper to eliminate the above-mentioned impact.