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本论文采用聚碳酸酯滤膜(0.4μm)和国内测定营养盐常用的醋酸纤维滤膜(0.45μm)过滤不同站位海水样品测定营养盐和Chl a,探究两种滤膜之间的区别。营养盐的对比结果表明,采用未干燥的醋酸纤维滤膜和聚碳酸酯滤膜过滤的亚硝酸盐、铵氮、磷酸盐和硅酸盐均不存在显著性差异,硝酸盐存在显著性差异但差别小于2%,因而两种滤膜均适用于海水溶解态营养盐的过滤。干燥后的醋酸纤维滤膜过滤速度慢,且过滤过程中会引入较高的铵氮。Chl a的对比结果表明,聚碳酸酯滤膜更加适合Chl a的测定,醋酸纤维滤膜的截留效率明显低于聚碳酸酯滤膜,这可能是由于该滤膜无法完全截留小粒径的浮游植物。
In this thesis, samples of seawater from different stations were filtered through a polycarbonate filter (0.4μm) and a cellulose acetate membrane (0.45μm) commonly used in China to determine nutrients and Chla. The difference between the two filters was explored. Comparison of nutrient salts showed that there was no significant difference in nitrite, ammonium nitrogen, phosphate and silicate filtered using undried cellulose acetate and polycarbonate filters, with significant differences in nitrate Differences of less than 2%, so both filters are suitable for seawater dissolved nutrients filtering. After drying, the filtration rate of cellulose acetate membrane is slow, and high ammonium nitrogen will be introduced during filtration. Chl a comparison results show that the polycarbonate filter is more suitable for Chl a determination of cellulose acetate membrane retention efficiency was significantly lower than that of polycarbonate membrane, which may be due to the filter can not completely retain small particle size float plant.