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62 63 64 65 66 67 68 69 6 10 6 11 Methylthymol blue DIssolve 0 1182 g of methylthymol blue (3'3"-bIS-N,N-biS carboxymethyl)-ammo methylthymolsulfone-phthalem pentasodmm salt) m 25 ml of banum chlonde solutIon (6 1) Add 4 ml of ION hydroch10nc aCid whIch changes the color to bnght orange Add 71 ml of water and dtlute to 500 ml wIth ethanol The pH of thts solution IS 2 6 ThIS reagent should be prepared the day before and stored m a brown plastic bottle m the refngerator Buffer, pH 10 5 ± 0 5 Dissolve 6 75 g of ammOnium chlonde m 500 ml of disttlied water Add 57 m1 of concentrated ammOnium hydroxide and dtlute to one hter wIth disttlied water Buffered EDT A DIssolve 40 g oftetrasodmm EDT A m pH 10 5 buffer (63), and dtlute to one hter wIth buffer Sodmm hydrOXIde solutIOn, (50%) DIssolve 500 g NaOH m 600 ml of disttlied water, cool, and dtlute to 1 hter Sodmm hydroxIde, 0 18N Dtlute 144 ml ofsodmm hydroxIde solutiOn (65) to 1 hter Ion exchange resm BIO-Rex 70, 20-50 mesh, sodmm form, Bio-Rad LaboratorIes, RIchmond, Cahfornia Free from fines by stIfnng wIth several portiOns of deiOnized water and decant the supernate before settlmg IS complete Ddution Water Add 0 75 ml of sulfate stock solutIOn (69) and 3 drops of BnJ-35 to 2 hters ofdisttlied water Sulfate stock solutIOn, 1 ml = 1 mg 804 Dissolve 1479 g of dned (l05°C) NaZS04 m dlsttlled water and dtlute to 1 hter DIlute sulfate solutiOn, 1 ml = 0 1 mg SO4 Dtlute 100 ml of sulfate stock SolutIon (6 9) to 1hter HIgh level workmg standards, 10-300 mg/1 Prepare htgh level workmg standards by dtlutmg the followmg volumes ofstock standard (6 9) to 100 ml ml stock mg/l 804 1 10 5 50 10 100 15 150 25 250 30 300 612 Low level workmg standards, 1-30 mg/1 Prepare low level workmg standards by dtlutmgthefollowmgvolumesofdtlutesulfateSolutIon(6 10)to 100ml ml stock mg/l 804 1 10 5 50 10 15 25 30 100 150 250 300 3752-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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