1) Different dopants including rare earth metals, alkali earth metals, transition metals and other elements are introduced, and the trend of the mixed oxides in exhaust purification is prospected.

2) The wollastonite as the alkali earth metal silicate, helps the melt in the ordinary ceramic body the function, reduces the body the agglutination temperature.

3) Determination of alkali earth metal by microwave plasma torch atomic emission spectrometry ( MPT AES ) was investigated.

4) In this study, a new idea that RDF is made with catalysis of alkali, alkali earth or transition metal salts. The addition of the catalysts is to low ignition and burn off temperature temperature.

5) The instrument is suitable for determing of anions, alkali metals and alkali earth metals in nuclear fuel reprocessing solution and high level liquid waste.

6) The ethoxylation of span-80 catalyzed by several alkali metal salts and alkali earth metal salts has been studied in this article. The new catalyst(DF-1) was found effective for the ethoxylation.

7) The main attention focuses on the introduction of research progress on alkali and alkali earth compounds, rare earth oxides and complex oxides as catalysts since 1989.

8) The source made a breakthrough the idea that air acetylene flame emission spectrometry was used for determination of alkali and alkali earth elements only.