PDF Publication Title:
Text from PDF Page: 462
4. Sample Handlmg and PreservatIon 4I Samplmg and storage of samples m glass bottles IS preferable Samphng and storage m plastIc bottles such as conventiOnal polyethylene and cubitamers IS permISSIble If It IS estabhshed that the contamers do not contnbute contammatmg orgamcs to the samples NOTE 1: A bnef study performed m the EP A Laboratory mdicated that dIst111ed water stored m new, one quart cubitamers dId not show any mcrease m orgamc carbon after two weeks exposure 42 Because ofthe possIbIhty ofoXIdatiOn or bactenal decomposItiOn ofsome components of aqueous samples, the lapse of time between collectiOn of samples and start of analySIS should be kept to a IrlJmmum Also, samples should be kept cool (4°C) and protected from sunhght and atmosphenc oxygen 43 In mstances where analySIS cannot be performed withm two hours (2 hours) from time of samplmg, the sample IS aCIdIfied (pH s 2) wIth HCl or H2S04 5 Interferences 51 52 Carbonate and bIcarbonate carbon represent an mterference under the terms of thIS test and must be removed or accounted for m the final calculation ThIS procedure IS apphcable only to homogeneous samples whIch can be mJected mto the apparatus reproducIbly by means of a mICrohter type synnge or pIpette The opemngs of the synnge or pIpette hmit the maXImum SIze of partICles whIch may be mcluded m the sample 6 Apparatus 61 Apparatus for blendmg or homogemzmg samples Generally, a Wanng-type blender IS satIsfactory 62 Apparatus for total and dIssolved orgamc carbon 6 2 1 A number of compames manufacture systems for measurmg carbonaceous matenal m hqUld samples ConsIderatiOns should be made as to the types of samples to be analyzed, the expected concentratiOn range, and forms of carbon to be measured 6 2 2 No specIfic analyzer IS recommended as supenor 7. Reagents 7 1 72 7 3 7 4 DIstl1led water used m preparatiOn of standards and for dIlutIon of samples should be ultra pure to reduce the carbon concentratiOn of the blank Carbon diOXIde-free, double dIstIlled water IS recommended Ion exchanged waters are not recommended because of the pOSSIbIhtIes ofcontammatiOn wIth organIC materIals from the resms PotaSSIUm hydrogen phthalate, stock solutiOn, 1000 mg carbon/hter DIssolve 0 2128 g of potassIUm hydrogen phthalate (Pnmary Standard Grade) m dIstIlled water and dIlute to 100 Oml NOTE 2' SodIUm oxalate and acetic aCId are not recommended as stock solutiOns PotaSSIUm hydrogen phthalate, standard solutiOns Prepare standard solutiOns from the stock solution by dl1utiOn WIth dIStilled water Carbonate-bIcarbonate, stock solutiOn, 1000 mg carbon/hter WeIgh 03500 g of sodIUm bIcarbonate and 04418 g of sodIUm carbonate and transfer both to the same 100 ml volumetncflask DIssolveWIthdIStIlledwater 415 1-2PDF 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 |