PDF Publication Title:
Text from PDF Page: 425
7 Procedure 7 1 7 2 73 74 75 Set up the mamfold for hIgh (0-300 mg S04/1) or low (0-30 mg S04/1) level samples as descnbed m FIgure I The Ion exchange column IS prepared by pulhng a slurry of the resm mto a pIece of glass tubmg75mcheslong,20mmIDand36mmOD ThISISconvementlydonebyusmga pIpet and a loose fittmg glass wool plug m the tubmg Care should be taken to aVOid allowmg aIr bubbles to enter the column If aIr bubbles become trapped, the column should be prepared over agam The column can exchange the eqUlvalent of 35 mg of calcmm For the hIgh level mamfold thIS corresponds to about 900 samples wIth 200 mg/l Ca The column should be prepared as often as necessary to assure that no more than 50% of ItS capaCIty IS used up Allow the colonmeter, recorder and pnnter to warm up for 30 mmutes Pump all reagents untl1 a stable basehne IS achIeved Analyze all workmg standards m duphcate at the begmmng of a run to develop a standard curve The A and B control standards are analyzed every hour to assure that the system remams properly cahbrated Smce the chemIstry IS non-hnear the 180 mg/l standard IS set at 50% on the recorder usmg the standard cahbratIOn control on the colonmeter At the end ofeach day, the system should be washed WIth the buffered EDTA solutIOn (64) ThIS IS done by placmg the methylthymol blue hne and the sodmm hydroxIde hne m water for a few mmutes and then m the buffered EDTA solutIOn for 10 mmutes Wash the system WIth water for 15 mmutes before shuttmg down 8 CalculatIOn 8 1 Prepare a standard curve by plottmg peak heIghts of processed standards agamst known concentratIOns Compute concentratIOn of samples by comparmg sample peak heIghts WIth the standard curve 9 PreCIsIon and Accuracy 9 1 In a smgle laboratory the estImated standard deVIatIOn, calculated from duphcate analyses of 26 surface and wastewaters at a mean concentratIOn of 110 mg/l was ±1 6 mg/l 9 2 The mean recovery from 24 surface and wastewaters was 102% BIblIography 1 Lazrus, A L, Hl1l, K C and Lodge, J P , "AutomatIOn m AnalytICal ChemIstry", Techmcon Symposia, 1965 2 Coloros, E , Panesar, M R and Parry, F P , "Lmeanzmg the CahbratIOn Curve m DetermmatIOn ofSulfate by the Methylthymol Blue Method", Anal Chern 48, 1693 (1976) 3752-3PDF Image | Methods for Chemical Analysis of Water and Wastes
PDF Search Title:
Methods for Chemical Analysis of Water and WastesOriginal File Name Searched:
epa600_4_79_020.pdfDIY PDF Search: Google It | Yahoo | Bing
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
Heat Pumps CO2 ORC Heat Pump System Platform More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |