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1 2 3 Sample 1 Sample 1 2 3 Stock SolutlOn D1ssolve 0829 g ofmagneslUm oX1de, MgO (analytlCal reagent grade), m 10mlofred1stl1ledHN03anddl1uteto 1hterw1thdelOmzedd1stl1ledwater 1ml = 050 mg Mg (500 mg/l) Lanthanum chlonde solutlOn D1ssolve 29 g ofLa203, slowly and m small portlOns m 250 ml conc HCI, (CautlOn ReactlOn 1S vlOlent), and d1lute to 500 ml w1th delOmzed d1st1lled water Prepare dl1utlOns of the stock magneslUm solutlOn to be used as cahbratlOn standards at thet1meofanalys1s Toeach10mlvolumeofcahbratlOnstandardandsampleahkeadd 1 0 ml of the lanthanum chlonde solutlOn, 1e , 20 ml of standard or sample +2 ml LaCl3 = 22ml Preservation For sample handhng and preservatlOn, see part 4 1 of the Atom1C AbsorptlOn Methods sectlOn ofth1s manual Preparation For the analys1s of total magneslUm m domest1c and mdustna! effluents, the procedures for the determmatlOn of total metals as glven m parts 4 1 3 and 4 1 4 of the AtomlC AbsorptlOn Methods sectlOn ofth1s manual have been found to be satisfactory For amb1ent waters, a representative ahquot of a well-m1xed sample may be used d1rectly for analys1s If suspended sohds are present m suffic1ent amounts to clog the nebuhzer, the sample may be allowed to settle and the supernatant hqUld analyzed d1rectly Samples should be preserved w1th (1 1) mtnc aC1d to a pH of2 at the t1me ofcollectlOn MAGNESIUM Method 242.1 (Atomic Absorption, direct aspiration) Optimum Concentration Range: SensItivity: 0007 mg/l DetectIon Limit: 0 001mg/l Preparation of Standard Solution STORET NO. Total 00927 Dissolved 00925 Suspended 00926 002-0 5 mg/l usmg a wavelength of285 2 nm Instrumental Parameters (General) 1 MagneslUm hollow cathode lamp 2 Wavelength 2852nm Approved for NPDES Issued 1971 Ed1tonal reV1SlOn 1974 and 1978 2421-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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