Mcelhaney Morrow and others for a series of improvements, based on Massman developed resistance heated graphite furnace in different shapes and sizes, modern graphite tube did not occur until 1977, before these scientific research focused on anti-rational design of size and shape of the tube. Determination of the absorbance signal in the graphite tube size and the density of atoms, Atomic density and Atomic ratio of atoms in graphite tube travel in time. In order to avoid the loss caused in the graphite tube Atomic diffusion, should try to increase the length of tube, reducing its cross-sectional area. However graphite tube length of excessive current consumption, and small cross-sectional area will clear light, leading to a series of shortcomings such as noise. According to reports, the best graphite tube length for 2~5cm, son of ratio of length to diameter, d=b+1tgα (d is diameter, l is the length). World famous equipment manufacturers, such as graphite furnace series Perkin-Elmer GRA, Varvian CRA graphite products are based on this principle, combined with the characteristics of one’s instrument, designed various types of tubes.
With the development of atomic absorption graphite tube techniques, in the 1970 of the 20th century, the American P-E company, Varvian and I1, British P.Vnicam companies, Shimadzu Corporation, Hitachi, Seiko and g in Australia. BC company, second optical instrument factory of China Beijing, Beijing analytical instrument factory, Beijing geological instruments factory, Shanghai analytical instrument factory, Shenyang analytical instrument factory has the production with graphite furnace atomic absorption spectrophotometer. These manufacturers of equipment support of the graphite and graphite Cone, is the key component. As a graphite tube manufacturing business is booming, such as: the United States and, mainly electric and Hitachi’s original graphite tube.
