Comparison of filtration techniques for size distribution in freshwaters
Comparison of filtration techniques for size distribution in freshwaters
复制标题
淡水中尺寸分布过滤技术的比较
DOI：
10.1021/ac00245a023
复制
发表时间：
1982
期刊：
影响因子：
--
通讯作者：
I. M. Chandler
中科院分区：
文献类型：
--
作者：
D. Laxen;I. M. Chandler
Filtration of freshwaters through screen filters (Nuclepore) and depth filters (Sartorius), of 8-0.015 jum nominal pore size, Is critically evaluated. Screen filters (Nuclepore) provide more accurate size fractionation, as long as the filter Is not allowed to clog. No benefit derives from stirring the sample during filtration. Field filtration Is however necessary for the most reliable size fractionation. Criteria used to evaluate filtration properties are Iron and manganese filtrate concentrations and scanning electron microscope examination of the filtered particulates.Filtration has become a universally applied first step in the preparation of water samples for trace metal analysis. By tradition this filtration is usually performed with 0.45-/itm membrane filters, the resultant fractions usually being termed particulate anddissolved. With the growing awareness of the need to define the speciationof trace metals it has become apparent that this distinction between particulate and dissolved is arbitrary and of uncertain value. Colloidal material can pass through 0.45-/um filters and recent speciation studies have found substantial fractions of colloidally associated trace metals in many waters (1-3).
