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本文使用双管石墨炉原子吸收法(DPGT)研究了双管对21个元素的测定灵敏度的影响,并讨论了可能的增感机理。对于高挥发性元素,双管的灵敏度比普通管(GT)都有相同程度的提高,Pb、Cd、Zn、Se、Sn分别至1.7、1.6、1.6、1.6、1.8倍。对于中等或接近中等的挥发性元素如As、Sb、K、Cu、Cr、Mn、Co、Ni和Al、DPGT相对于GT增感系数分别为2.4、1.9、6.8、5.8、3.6、3.2、6.4、7.0和4.0倍。但DFGT和PGT所得吸收脉冲却较接近或相等。这些元素增感主要原因可能是热解涂层所引起。对于低温挥发性元素Mo、V,在DPGT比GT有较大的增感作用,但比PGT灵敏度低。
In this paper, double-tube graphite furnace atomic absorption spectrometry (DPGT) was used to study the effect of double tube on the determination sensitivity of 21 elements, and the possible mechanism of sensitization was discussed. For high-volatile elements, the sensitivity of the double tube increased to the same extent as that of the normal tube (GT), and the contents of Pb, Cd, Zn, Se and Sn were 1.7, 1.6, 1.6, 1.6 and 1.8 times respectively. For moderate or near moderate volatile elements such as As, Sb, K, Cu, Cr, Mn, Co, Ni and Al, the DPGT with respect to the GT sensitivities are 2.4, 1.9, 6.8, 5.8, 3.6, 3.2, 6.4 , 7.0 and 4.0 times. However, the absorption pulses obtained by DFGT and PGT are closer or equal. The main reason for the sensitivities of these elements may be caused by the pyrolytic coating. For low-temperature volatile elements Mo, V, DPGT has a greater sensitization than GT, but lower than PGT sensitivity.