cation grouping meaning in English

阳离子分组
阳离子活度

German standard methods for the examination of water , waste water and sludge ; cations group e ; determination of iron
德国检验水废水和污泥的标准方法.阳离子组
German standard methods for the examination of water , waste water and sludge ; cations group e ; determination of manganese
德国检验水废水和污泥的标准方法.阳离子e组.锰
German standard methods for the examination of water , waste water and sludge ; cations group e ; determination of ammonia - nitrogen
德国检验水废水和污泥的标准方法.阳离子e组.铵
German standard methods for the examination of water , waste water and sludge - cations group e - part 33 : determination of manganese by atomic absorption spectrometry
德国对水废水和淤泥的标准检验法.阳离子组