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E.Lundberg等人在用石墨炉原子吸收法测锡的影响因素中指出,由于锡有生成挥发性化合物和与石墨互相作用的倾向,因此锡是用石墨炉测定最麻烦的元素之一.W.B.Barnett等人用石墨炉原子吸收法测定了铜和锌合金中六个元素,其中锌合金中锡是用标准加入法,而测黄铜中锡,无论用合成标准法还是用标准加入法都未成功.本文用涂钨热解管,提高了灰化温度,同是采用抗坏血酸作干扰抑制剂,消除了锌基体及共存元素的干扰,用标准曲线法直接测定锌合金中微量锡,获得了满意结果.实验表明,抗坏血酸不能抑制铜对锡的干扰,但采用标准加入法测定铜合金中锡,结果与标准值吻合.本方法的灵敏度为14pg/1%吸收,检测限为4pg(4.0×10~(-12)g).
E. Lundberg et al., In the influencing factors for the determination of tin by graphite furnace atomic absorption, pointed out that tin is one of the most troublesome elements to be measured by a graphite furnace due to the tendency of tin to generate volatile compounds and interact with graphite. Barnett et al. Determined six elements in copper and zinc alloys by graphite furnace atomic absorption spectrometry. Tin in the zinc alloy was measured by standard addition method and tin in brass, both in synthetic and standard methods Success.This paper used a pyrolytic tube coated with tungsten to increase the temperature of ashing and used ascorbic acid as an interference inhibitor to eliminate the interference of the zinc matrix and the coexisting elements and to determine the trace tin in the zinc alloy by the standard curve method, The results show that ascorbic acid can not inhibit the interference of copper with tin, but the standard addition method is used to determine the content of tin in the copper alloy, the result is consistent with the standard value.The sensitivity of this method is 14pg / 1% absorption with the detection limit of 4pg ~ (-12) g).