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3 Fuel Acetylene 4. OX1dant A1r 5 Typeofflame Reducmg Analysis Procedure 1. For analys1s procedure and calculatlOn, see "D1rect Asp1ratlOn", part 9 1 of the Atom1C Absorpt1on Methods sectlOn ofth1S manual Notes 1 Phosphate, sulfate and alummum mterfere but are masked by the add1t1on of lanthanum Smce low calcmm values result 1f the pH of the sample 1S above 7, both standards and samples are prepared m dl1ute hydrochlonc aC1d solutlOn ConcentratlOns ofmagnesmm greater than 1000 mg/1 also cause low calcmm values ConcentratlOns of up to 500 mg/1 each ofsodmm, potassmm and mtrate cause no mterference 2 Amomc chem1cal mterferences can be expected 1flanthanum 1S not used m samples and standards 3 The mtrous oX1de-acetylene flame w1ll prov1de two to five t1mes greater sens1t1v1ty and freedom from chemlCal mterferences IomzatlOn mterferences should be controlled by addmg a large amount of alkah to the sample and standards The analys1s appears to be free from chem1cal suppreSSlOns m the mtrous oX1de-acetylene flame (Atom1c AbsorptlOn Newsletter 14,29 [1975]) 4 The 239 9 nm Ime may also be used Th1S hne has a re1at1ve sens1t1v1ty of 120 5. Data to be entered mto STORET must be reported as mg/1 6 The EDTA tltnmetnc method may also be used (Standard Methods, 14th Ed1tlOn, p 189) Precision and Accuracy 1 In a smgle laboratory (EMSL), usmg d1st111ed water sp1ked at concentratlOns of 9 0 and 36 mgCa/1, the standard dev1atlOns were ±O 3 and ±O 6, respect1vely Recovenes at both these levels were 99% 215 1-2PDF Image | Methods for Chemical Analysis of Water and Wastes
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