原子吸光定量のための塩酸抽出条件の検討

In order to determine the contents of the eight inorganic elements(Na, K, Ca, Mg, Cu, Mn, Fe and Zn)in vegetable by atomic absorption and flame emission spectrometry, the standard reference material (NBS-SRM 1573 Tomato Leaves) already known as determining the contents of inorganic elements was used as a sample, and the following results were obtained through comparative experiments, varying degrees on hydrochloric acid concentration(1%,2%,5%and 10%), extracting temperature(20°C,60°Cand80°C)and heating time(30,60and120minutes).<BR>1) Hydrochloric acid concentration was the most influential factor in determining the elemeats among the hydrochloric acid concentration, extracting temperature and heating time.<BR>2)Tne appropriate conditions of the eight elements were as follows: Na: 2%hydrochloric acid at 60°C of extracting temperature for 30 and 60 minutes of heating time.<BR>K: 1% hydrochloric acid at 60°C for 120 minutes and at 80°C for 120 and 60 minutes.<BR>Ca: 1% hydrochloric acid under all conditions of extracting temperatue and heating time. Mg: 1% and 2% hydrochloric acid under all conditions of the time and ternperature.<BR>Cu: 5% and 10% hydrochloric acid under all conditions of the time and temperature.<BR>Mn: 1% hydrochloric acid at 20°C for 30 and 60 minuts, 2% hydrochloric acid at 20°C under all conditions of the time and at 60°C for 60 minutes.<BR>Fe: 10% hydrochloric acid at 80°C for 120 minutes.<BR>Zn: 1%, 2% and 5% hydrochloric acid under all conditions of the time and temperature.<BR>3)One of the effective conditions most applicable to the simultaneous determination of the eight inorganic elements in the same material solution is as follows: 2% hydrochloric acid at 60°C of extracting temperature for 60 minutes of heating time.