炭素チューブを用いた原子吸光分析法における累積濃縮法の検討と炭素チューブの改良

抄録

The determination of copper in a very diluted solutions which could not be detected by the ordinary carbon tube method became possible by a multifold concentration method. The method is carried out by atomizing after repeated injection of sample and drying. However since the reproducibility tends to decrease when the conventional carbon tube (type A) is used, an attempt was made to improve the carbon tube. The first one (type B) has a smaller injection window of 1.5 mm diameter, so as to stopper the top of the pipette at fixed position. The second one (type C) has a small hole right under the injection window of type B. The reproducibility was improved by using the new tubes but type C was better than type B when the number of times of injection repeated was increased. Although the relation between the peak height and the number of times repeated was linear within fifteen times, the peak height slightly exceeded the expected value over twentytimes.