摘要
本文使用新极谱法研究不同材质器皿、温度、pH、富里酸浓度条件下,水样中0.05—0.10 ppb Se(Ⅳ)和Se(Ⅵ)的贮存损失,实验结果确定,低温、酸性、加入富里酸的石英器皿贮存硒的效果最好,玻璃器皿最差,聚乙烯居中,采用硝酸钝化过的聚乙烯瓶贮存天然水,加硝酸调节pH为1.0时,Se(Ⅳ)和Sc(Ⅵ)保存一个月浓度基本不变。
A new polarographic method has been used to study the effects of preserving conditions, such as materials of container, pH, temperature, and addition of fulvic acid, on the losses of Se(Ⅳ) and Se(Ⅵ) at the initial levels of 0.05-0.10 ppb in water samples during preservation. 11 has been found that, when the water samples were preserved at low temperature and added with fulvic acid under the acidic condition, quartz containers were the most suitable to be used for the purpose, and glass containers were the most unsuitable to do so while polythene ones were between them. The use of polythene bottles passivated with nitric acid for preserving the natural water, adjusting pH to 1.0 with HN'O3, has led to the levels of Se(Ⅳ) and Se(Ⅵ) almost without change for one month.
出处
《环境科学》
EI
CAS
CSSCI
CSCD
北大核心
1989年第5期26-30,共5页
Environmental Science
