水素化物発生-原子分光法よるヒ素及びセレンの定量
スポンサーリンク
概要
- 論文の詳細を見る
A new hydride-generation system was developed for the determination of arsenic and selenium by atomic absorption spectrometry (AAS), inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). Arsine and hydrogen selenide were generated in a mixing coil by mixing the relevant acid solution with a sodium tetrahydroborate solution. The hydrides were separated effidently from the by-products in the spiral tube of a gas-liquid separator, which was sealed with an electromagnetic pinch valve. Thus, the consumption of the reagents and waste was minimized. The system was operated with variable speed-peristaltic pumps and the pinch valves by manipulating electromagnetic relays and timers. In AAS, hydride gas was introduced into a heated quartz furnace with nitrogen gas after a definite evolution time in order to attain high sensitivity. In ICP-AES and ICP-MS, hydride gas was introduced continuously into the torch of an argon plasma. In ICP-AES, a large evolution of hydrogen gas was suppressed in the present hydride-generation system to keep the plasma from extinguishing. In ICP-MS, arsenic-75 and selenium-82 were precisely determined with a high mass resolution without molecular ion interferences. The arsenic and selenium contents in river water were determined by ICP-AES and ICP-MS after any interferences with transition metals were eliminated with Chelex 100 resin.
- 社団法人日本分析化学会の論文
- 1997-01-05