METHODS The detection select wavelengths of 769.5 nm, 330.2 nm, 422.7 nm, 285.2 nm were selected to determine K +, Na +, Ca 2+ ,Mg 2+ by atomic absorption spectrometry(AAS).

• 方法 :采用原子吸收火焰法 (AAS) ；加入 4 g·L-1SrCl2 作为K+ 、Na+ 的离子抑制剂和Ca2 + 、Mg2 + 的离子释放剂 ；选择K+ 76 9.；5nm、Na+ 330