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Study of redox flow battery systems for residential applications E.2 Quality control with portable density meter The total vanadium concentration was obtained by dilution with deionized water. These measurements do not take into account the dilution of sulfuric acid and temperature variation. 1.80 1.70 1.60 1.50 1.40 1.30 1.20 1.30 1.32 1.34 1.36 1.38 1.40 Density (g cm-3) y = 5x - 5.19 R2 = 1 Figure E.1 – Experimental curve of density variation with total vanadium concentration at a temperature of 23.8 oC. Using a portable density meter demonstrated to be an interesting method for quality control of electrolyte. Further development of such method can be done. Vanadium electrolyte density needs to be determined at temperatures from 15 oC up to 30 oC and for different sulfuric acid concentrations in order to obtain accurate vanadium concentration measurements. Also, vanadium electrolyte density dependency on V3+/V4+ ratio is yet to be demonstrated due to lack of time. This method can further be investigated to be used also as quality control parameter. These calibration curves can then be implemented in the portable density meter, which also measures the temperature of solution, to obtain an instant measurement of total vanadium concentration and V3+/V4+ ratio. Appendix E Other work carried out 87 Vanadium concentration (mol L-1)PDF Image | Tubular Vanadium Air Redox‐flow battery
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