Determination of trace analytes based on diffuse reflectance spectroscopic techniques: development of a multichannel membrane filtration-enrichment device to improve repeatability

Digital image colorimetry coupled with a multichannel membrane filtration-enrichment technique to detect low concentration dyes

“…The membrane ltration-enrichment process was carried out by the homemade six-channel membrane ltration-enrichment device utilized in our previous study. 21 A laboratory-made digital image acquirement system (Fig. 2) consisted of a foam box of approximately 31 cm  24 cm  17 cm, which was equipped with two LED lamps with 84 guide plates (14.5 cm  6 cm, 20 W) to provide a uniform illumination.…”

“…It is necessary to investigate and optimize them to obtain the highest possible sensitivity. In our previous research, 21 these parameters have been thoroughly optimized and reported in detail. The optimal experiments in this study were investigated by both digital image colorimetry and UV-vis spectral analysis, and the obtained results are very similar.…”

“…It is oen employed to separate and concentrate micron-sized and low concentration particles from uids with microscopic pore (0.1-10 micrometer) membrane lters via the interactions, including van der Waals forces, electrostatic interaction, and hydrogen bonding, between the analyte molecules and the lter matrix. [16][17][18] Unlike most of the research, our group [19][20][21] simpli-ed the detection process by omitting the elution step and directly measuring the diffuse reectance spectrum of the membrane lter concentrated analytes, i.e. on-line spectroscopic determination.…”

Multilayer and multichannel membrane filtration for separation and preconcentration of trace analytes and its application in spectral analysis

“…The membrane ltration-enrichment process was carried out by the homemade six-channel membrane ltration-enrichment device utilized in our previous study. 13 The selected membrane lters were stacked up and placed between the multichannel solution importer and the ltration device (Fig. 1).…”

“…[1][2][3] It has received considerable attention and has been widely used for the separation and preconcentration of trace metallic ions aer chromogenic reactions [4][5][6][7][8][9][10] and for several organic compounds. [11][12][13][14][15][16][17][18] Unlike most of the studies, our group 4,9,11,12 simplied the detection process by omitting the elution step and directly measuring the diffuse reectance spectrum of the membrane lter concentrated analytes, i.e. on-line spectroscopic determination.…”