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As it has been certified by experimental testing that when using the energy-dispersive X-ray fluorescence (EDXRF) method to analyze the metallic elements contained in the tea the energy segment of effective X-ray fluorescence photons is located between 3 and 16 keV. Accordingly the spectral correction element is targeted at the copper elements located near the energy center(8 keV). The copper elements are also used as the picketage to be the standard curve. In the energy segment of effective X-ray fluorescence photons contained in the tea 1.25 mg · kg(-1) of the average detection limit was obtained by using the spiked method to analyze four elements of copper, iron, zinc and lead. Compared with the flame atomic absorption spectrum(FAAS), the actual relative error of the tested value by EDXRF is less than 6%, and the relative standard deviation is less than 5%. The result by T test shows that p > 0.05. The conclusions are that there are no statistically significant differences between EDXRF and FAAS. The measured results gained by the two methods agree with each other. And EDXRF can be used thoroughly to test the metal contents contained in the tea. The result shows that it is feasible to test the metallic contents contained in the tea by EDXRF, and its measured result can meet the requirements of field testing and analysis.

The Ishinpō written in 984 is the oldest extant medical work in Japan. In this work a unique sequence of characters, [Japanese characters] (Kyō gige in Japanese, Jing Yijie in Chinese) followed by the character [Japanese character], which usually indicates a citation, can be found only once in vol. 25 of the Nakarai-MA [Japanese character]. That is why it has been regarded as a cited book title until now. However, there were no books with the title [Japanese characters] before the time of the Ishinpō. The authors therefore tried to make a historical investigation into this phrase. The following results could be found: (1) The phrase in question has to be seen as one unit together with the last character of the former line [Japanese character] and should be read as [Japanese characters] (Myakukyō Gige in Japanese, Maijing Yijie in Chinese). (2) There are no books extant with the title [Japanese characters], and we see no possibility that such a book might have been written before the time of the Ishinpō. (3) The most possible reason why the phrase [Japanese characters], which is not a book title is given only here is miscopy and mispagination. Originally, there must have been two separate citations, one from [Japanese characters], an annotated book to the Maijing [Japanese characters], and the other from [Japanese characters], a shortened name of the Ryō-no Gige [Japanese characters]. As a result of miscopy and omissions, [Japanese characters] were finally combined to [Japanese characters]. (4) The sentence [Japanese characters] which follows the phrase [Japanese characters] may be a missing part of the [Japanese characters]. (5) There is a possibility that the [Japanese characters] might have been the Maijing Yinyi written in China, or any other unknown book written in Japan.