PDF Publication Title:
Text from PDF Page: 398
9 10 Calculation 9 1 Prepare a standard curve by plottIng peak heIghts of processed standards agaInst known concentratIOns Compute concentrations of samples by companng sample peak heIghts withstandardcurve AnysamplewhosecomputedvalueISlessthan5%ofItSImmedIate predecessor must be rerun PrecISIon and Accuracy (AAI system) 10 1 SIX laboratones partICIpatIng In an EP A Method Study, analyzed four natural water samples contaInIng exact Increments oforthophosphate, wIth the follOWIng results 8 3 Orthophosphate 8 3 1 Add 1 drop of phenolphthaleIn IndIcator solutIOn (7 9) to approxImately 50 ml of sample If a red color develops, add sulfunc aCId solutIOn (7 6) drop-WIse to Just dIscharge the color ACId samples must be neutrahzed wIth 1 N sodmm hydroXide (40gNaOH/l) 8 3 2 Set up mamfold as shown In FIgure 2, AAI or FIgure 3, AAII 8 2 2 8 2 3 8 2 4 Boll gently on a pre-heated hot plate for 30-40 mInutes or untll a final volume of about 10 mIls reached Do not allow sample to-go to dryness Alternatively, heat for 30 mInutes In an autoclave at 121°C (15-20 pSI) Cool and dllute the sample to 50 ml I f sample IS not clear at thIS POInt, filter, DetermIne phosphorus as outhned In (8 3 2) wIth aCId wash water (7 8) In wash tubes 8 3 3 8 3 4 8 3 5 8 3 6 Allow both colonmeter and recorder to warm up for 30 mInutes ObtaIn a stable basehne wIth all reagents, feedIng dlstllied water through the sample hne For the A A I system, sample at a rate of 201hr, 1 mInute sample, 2 mInute wash For the A A II system, use a 301hr, 2 1 cam, and a common wash Place standards In Sampler In order of decreaSIng concentratIOn Complete filhng ofsampler tray wIth unknown samples SWItch sample hne from dIstilled water to Sampler and begIn analySIS Increment as Orthophosphate mg P/hter 004 004 029 030 PreCISIon as Standard DevIatIon mg P/hter 0019 0014 0087 0066 Accuracy as 102 In a single laboratory (EMSL), USing surface water samples at concentratIOns of 0 04, 019, 035, and 084 mg P/l, standard devIatIOns were ±O 005, ±O 000, ±O 003, and ±0 000, respectIvely 10 3 In a single laboratory (EMSL), USing surface water samples at concentratIons of0 07 and 076 mg p/l, recovenes were 99% and 100%, respectively 365 1-6 BIas, % +167 - 83 -155 -128 BIas, mg P/hter +0007 -0003 -005 -004 I III III II 1111 IIPDF 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 |