火焰原子吸收法测定海水中的铜和钴

本文用火焰原子吸收光谱法测定海水中的铜,钴,方法简单,快捷,具有良好的精密度和准确性。本法的相对标准偏差为Ｃｕ３．９％－５．０％,Ｃｏ１．６％－３．１％,回收率为Ｃｕ９３％￣１０３．５％,Ｃｏ９４．４％￣１０５％。     

Morphology analysis of magnesium hydroxide prepared by magnesium oxide hydration within seawater

In order to investigate the microstructure of magnesium oxide hydration product within seawater, two reaction conditions (liquid‐solid and gas‐liquid‐solid) and two solutions (seawater and deionized water) were adopted for magnesium oxide hydration. The characterization of the hydration product using X‐Ray diffraction and scanning electron microscope was performed. Experimental results indicate that cations and anions in seawater promote the hydration. Most of the hydration products within seawater system display flower‐like morphology, but the agglomeration phenomenon is not obvious within deionized water system, especially for the supernatant layer products within deionized water system under gas‐liquid‐solid reaction condition. There was no stratification phenomenon occurred when MgO hydrated with seawater under three‐phase reaction condition.