Ultrafiltration monitoring system

It is proposed that the apparatus of Figure 2 would be a useful tool in monitoring ultrafiltration of latex and electrophoretic paints and in systems design (11). 

Sample preparation Plasma. 1 mL Plasma 50 p.L 100 pg/mL oxacillin in water -I- 20 pL 4% aqueous sodium dodecyl hydrogen sulfate solution, shake for 30 min, filter (Amicon MPS-1 micropartition system, YMT membrane) while centrifuging, a( ust the pH of the ultrafiltrate to 6.3-6.5 with pH 4 citrate buffer, inject a 500 pL aliquot onto column A with mobile phase A and elute to waste, after 10 min elute the contents of column A onto column B with mobile phase B, elute with mobile phase B, monitor the effluent from column B. Urine. 5-100 pL Urine -I- 50 pL 100 pg/mL oxacillin in water, make up to 500 pL with water, inject onto column A with mobile phase A and elute to waste, after 10 min elute the contents of column A onto column B with mobile phase B, elute with mobile phase B, monitor the effluent from column B. 

At present, online methods have not been frequently utilized in biogas plants. Still, infrared and near-infrared spectroscopies were shown to be able to monitor VFA, COD, and TOC concentrations simultaneously in industrial and lab-scale digesters (Holm-Nielsen et al, 2008 Spanjers et al., 2006 Steyer et al., 2002). To achieve this, an ultrafiltration unit is generally included to the system to provide clear liquid free of... 

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