PDF Publication Title:
Text from PDF Page: 297
CHLORINE, TOTAL RESIDUAL Method 330.5 (Spectrophotometric, DPD) STORET NO. 50060 1 Scope and ApphcatiOn l I T h e DPD-Colonmetnc method IS apphcable to natural and treated waters at concentratiOns from 0 2-4 mg/1 2 Summary of Method 2 1 Chlonne (hypochlonte lon, hypochlorous aCId) and chioramllles stoichiometncally hberate IOdllle from potassmm IodIde at pH 4 or less 22 2 3 2 4 3 1 Any oXIdIzmg agents, these are usually present at lllsIglllficant concentratIons compared to the resIdual chlonne concentratIOns 3 2 TurbIdIty and color wIll essentIally prevent the colonmetnc analySIS 4 Apparatus 4 1 Spectrophotometer for use at 515 nm and cells ofhght path 1cm or longer 5 Reagents The hberated IOdllle reacts wIth N,N-diethyl-p-phenylene diamllle (DPD) to produce a red colored solutIOn The solutiOn IS spectrophotometncally compared to a senes of standards, USlllg a graph or a regressiOn analysIs calculatIOn The results are read or calculated llltO mg/1 CI 3 Interferences 5 1 52 53 54 55 Phosphate buffer solutiOn DIssolve 24 g anhydrous disodmm hydrogen phosphate, Na2HP04, and 46 g anhydrous potassmm dihydrogen phosphate, KH2P04, III dIstIlled water DIssolve 800 mg disodmm ethyienediamllle tetraacetate dihydrate III 100 ml dIstIlled water Combllle these two solutIOns and dIlute to 1 lIter wIth dIstIlled water Add 20 mg Hg Cl2 as a preservatIve N,N-DIethyl-p-phenylenediamllle (DPD) llldicator solutIOn DIssolve 1 g DPD oxalate or 1 5 g p-amlllo-N,N-diethYlallllIne sulfate III chlonne free disttlled water contallllllg 8 ml of 1 +3 H2S04 (5 3) and 200 mg disodmm ethyienediamllle tetraacetate dIhydrate DIlute to litter, store III a colored, glass-stoppered bottle DIscard when dIscolored The buffer and mdicator sulfate are avaIlable as a combllled reagent III stable powder form CAUTION TheoxalateIStOXIC,aVOIdlllgestiOn Sulfunc aCId solutIOn (1 + 3) Slowly add one part of H2S04 (sp gr 1 84) to three parts of dIstIlled water Potassmm IodIde, KI crystals Stock Potassmm Permanganate SolutiOn Place 0891 g KMn04 111 a volumetnc flask and dIlute to 1 lIter Approved for NPDES Issued 1978 3305-1PDF 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 |