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BORON Method 212.3 (Colorimetric, Curcumin) STORET NO. Total 01022 Dissolved 01020 Suspended 01021 1 Scope and Apphcatlon 11 ThIS colonmetnc method finds maXImum utlhty for waters whose boron content IS below 1mg/l 12 The optImum range of the method on undtluted or unconcentrated samples IS 0 1-10 mg/lofboron 13 ThIS method IS apphcable to dr1Ok1Og, and surface waters, domestIc and 10dustnal wastes 2 Summary ofMethod 2 1 When a sample of water conta101Og boron IS aCIdIfied and evaporated 10 the presence of curcum1O, a red-colored product called rosocyamne IS formed The rosocyamne IS taken up 10 a sUItable solvent, and the red color IS compared wIth standards photometncally 3 Comments 31 NItrate mtrogen concentratIons above 20 mg/l 10terfere 32 Slgmficantly hIgh results are possIble when the total ofcalcmm and magnesmm hardness exceeds 100 mg/l as CaC03 Pass10g the sample through a catIon exchange resm ehmmates thIS problem 33 Close control of such vanables as volumes and concentratlOns of reagents, as well as time and temperature ofdry1Og, must be exerCIsed for maXImum accuracy 34 Data to be entered 1Oto STORET must be reported as ug/l 4 PrecIsIon and Accuracy 4 1 A synthetic sample prepared by the Analytlcal Reference ServIce, PHS, contam1Og 240 ug/l B, 40 ug/l As, 250 ug/l Be, 20 ug/l Se, and 6 ug/l V 10 dIstilled water, was analyzed by the curcum10 method wIth a relative standard devIatIon of 228% and a relatIve error of0% 10 30 laboratones 5 Reference 5 1 The procedure to be used for thIS determ1OatlOn IS found 10 Standard Methods for the Exammatlon of Water and Wastewater, 14th EdItIon, p 287, Method 405A (1975) Approved for NPDES Issued 1974 2123-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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