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以前的工作表明,采用衬钽管石墨炉原子吸收光谱法测定稀土元素,钽片形状和衬钽片的技巧,明显影响衬钽管的有效使用寿命和测定精度。半圆筒形钽片使用10—20次后,钽片即变质,测量精度变坏,而采用圆筒形钽片和适当的衬片技术,则可使用200余次。最近我们发现,除了采用适当的钽片形状和衬钽片技术之外,使用合适的保护气氛也是改进衬钽管方法的一个重要途径。
Previous work shows that the use of tantalum tube graphite furnace atomic absorption spectrometry of rare earth elements, tantalum sheet shape and lined with tantalum pieces of technology, significantly affect the effective life of lined tantalum tube and determination of accuracy. After the use of semi-cylindrical tantalum film 10-20 times, the tantalum piece is deteriorated, the measurement accuracy deteriorates, and the use of cylindrical tantalum pieces and the appropriate lining technology, you can use more than 200 times. Recently, we have found that using a suitable protective atmosphere in addition to the proper tantalum plate shape and lined tantalum sheet technique is an important way to improve the method of lining the tantalum tube.