Читать книгу X-Ray Fluorescence in Biological Sciences - Группа авторов - Страница 48

10 mg of ground and dried tea leaves were placed in a special glass tube. 1 ml of concentrated nitric acid and 50 μl of hydrogen peroxide were added and heated in an oven until fully evaporated. At the end of the process, 200 μl of 10% HNO₃, 20 μl of 100 mg/l internal Ga standard were added and mixed thoroughly. 10 μl of the resulting solution was placed to a quartz carrier, dried by infrared radiation and measured for five hundred seconds.