摘要
采用相同孔径(0.45μm)的混合纤维素酯膜和醋酸纤维素膜过滤海水样品,考察两种滤膜对营养盐的影响。结果表明,采用未经处理的混合纤维素酯膜过滤样品,未检出活性硅酸盐(DSi),但均能检出氨氮(NH_(4)^(+)-N)、硝酸盐氮(NO_(3)^(-)-N)、亚硝酸盐氮(NO_(2)^(-)-N)、活性磷酸盐(DIP);采用未经处理的醋酸纤维素膜过滤样品,未检出DSi和NO_(2)^(-)-N,但能检出NH_(4)^(+)-N、NO_(3)^(-)-N和DIP。经过超纯水或稀酸处理过的混合纤维素酯膜对各种营养盐的测定基本没有影响,但经过超纯水或稀酸处理过的醋酸纤维素膜对NH_(4)^(+)-N和NO_(3)^(-)-N测定仍有影响,而且经酸处理的醋酸纤维素膜影响大于经超纯水处理的滤膜;与未经处理和经超纯水处理的醋酸纤维素膜素相比,经过酸处理的醋酸纤维素膜不再对NO_(2)^(-)-N的测定有影响。
The influence on the nutrients in seawater by two kinds of reverse osmosis membranes was explored.Comparison and analysis were investigated by cellulose acetate membrane and mixed cellulose ester membrane at the same aperture(0.45μm).The results showed that no DSI was detected,but NH_(4)^(+)-N、NO_(3)^(-)-N、NO_(2)--N and DIP could be detected when the samples were filtered with untreated mixed cellulose ester membrane.DSI and NO_(2)^(-)-N were not detected,but NH_(4)^(+)-N、NO_(3)^(-)-N and DIP were detected when the sample was filtered with untreated cellulose acetate membrane.The various nutrients were not detected by the mixed cellulose ester membrane treated with ultrapure water or dilute acid,while NH_(4)^(+)-N and NO_(3)^(-)-N were still detected by the cellulose acetate membrane treated with ultrapure water or dilute acid,and the effect of cellulose acetate membrane treated with acid is greater than that of filter membrane treated with ultrapure water.Compared with the untreated and ultrapure water treated cellulose acetate membranes,ester membrane treated with acid has on effect on the determination of NO_(2)^(-)-N.
作者
任和
REN He(School of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 1022029,China)
出处
《环境科学导刊》
2022年第3期9-12,共4页
Environmental Science Survey
