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CALCIUM Method 215.1 (Atomic Absorption, direct aspiration) OptI~umConcentration Range: Sensitivity: 008 mg/l Detec,tIOn LImIt: 001 mg/l , STORET NO. Total 00916 Dissolved 00915 0 2-7 mg;i usmg a wavelength,of422 7 nm Preparation of Standard SolutIOn ,1 Stock SolutIOn Suspend 1 250 g ofCaC03 (analytical reagent grade), dned at 180°C for 1 hour before weIghmg, m deIOnIZed dlstilled water and dIssolve cautIOusly wIth a mmimum of dilute HCI Dilute t? 1000 ml wIth, deIOnIzed dIstilled water 1 ml = 0 5 mg Ca (500 mg/l) 2 Lanthanum chlonde solution DIssolve 29 g of La20 3, slowly and m small portIOns, m 250 ml conc HCI (CautIOn ReactIon IS VIOlent) and dilute to 500 ml wIth deIOnIZed dIstIlled water 3 Prepare dIlutIOns of the stock calcIUm solutIOns to be used as calIbratIOn standards at the tIme of analysIs To each 10 ml volume of calIbratIOn standard and sample alIke add 1 0 mlofthelanthanumchlondesolutIOn,1e,20mlofsta~dardorsample+2mlLaCl3 = 22ml Sample Preservation 1 For sample handlIng and preservatIon, see part 4 1 of the AtomIC Absorption Methods sectIOnofthISmanual Sample PreparatIon 1 For the analysIs of total calCIUm m domestIc and mdustnal effiuents, the procedures for the determmatIOn of total metals as gIven m parts 4 1 3 and 4 1 4 of the AtomIC Absorption Methods section ofthIs manual have been found to be satIsfactory 2 For ambIent waters, a representatIve alIquot ofa well-mIxed sample may be used dIrectly for analysIs If suspended solIds are present m suffiCIent amounts to clog the nebulIzer, the sample may be allowed to settle and the supernatant lIqUId analyzed dIrectly Instrumental Parameters (General) 1 CalCIUm hollow cathode lamp 2 Wavelength 422 7 nm Approved for NPDES Issued 1971 Editonal reVISIon 1974 215 1-1PDF Image | Methods for Chemical Analysis of Water and Wastes
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