EPA Method 108A Determination Of Arsenic Content In Ore Samples From Nonferrous Smelters
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ID： |
A376BEA741B14EE9BFE18404E755E800 |
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文件大小(MB)： |
0.03 |
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页数： |
17 |
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文件格式： |
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日期： |
2000-2-12 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
1882,METHOD 108A ) DETERMINATION OF ARSENIC CONTENT,IN ORE SAMPLES FROM NONFERROUS SMELTERS,NOTE: This method does not include all of the,specifications (e.g., equipment and supplies) and procedures,(e.g., sampling and analytical) essential to its,performance. Some material is incorporated by reference,from other methods in Appendix A to 40 CFR Part 60.,Therefore, to obtain reliable results, persons using this,method should have a thorough knowledge of Method 12.,1.0 Scope and Application.,1.1 Analytes.,Analyte CAS No. Sensitivity,Arsenic compounds,as arsenic,(As),7440-38-2,Lower limit 10 μg/ml,or less,1.2 Applicability. This method applies to the,determination of inorganic As content of process ore and,reverberatory matte samples from nonferrous smelters and,other sources as specified in an applicable subpart of the,regulations.,1.3 Data Quality Objectives. Adherence to the,requirements of this method will enhance the quality of the,data obtained from air pollutant sampling methods.,1883,2.0 Summary of Method.,Arsenic bound in ore samples is liberated by acid,digestion and analyzed by flame atomic absorption,spectrophotometry (AAS).,3.0 Definitions. [Reserved],4.0 Interferences.,Analysis for As by flame AAS is sensitive to the,chemical composition and to the physical properties (e.g.,viscosity, pH) of the sample. The analytical procedure,includes a check for matrix effects (Section 11.5).,5.0 Safety.,5.1 Disclaimer. This method may involve hazardous,materials, operations, and equipment. This test method may,not address all of the safety problems associated with its,use. It is the responsibility of the user to establish,appropriate safety and health practices and determine the,applicability of regulatory limitations prior to performing,this test method.,5.2 Corrosive Reagents. The following reagents are,hazardous. Personal protective equipment and safe,procedures that prevent chemical splashes are recommended.,If contact occurs, immediately flush with copious amounts of,water for at least 15 minutes. Remove clothing under shower,1884,and decontaminate. Treat residual chemical burns as thermal,burns.,5.2.1 Hydrochloric Acid (HCl). Highly corrosive,liquid with toxic vapors. Vapors are highly irritating to,eyes, skin, nose, and lungs, causing severe damage. May,cause bronchitis, pneumonia, or edema of lungs. Exposure to,concentrations of 0.13 to 0.2 percent can be lethal to,humans in a few minutes. Provide ventilation to limit,exposure. Reacts with metals, producing hydrogen gas.,5.2.2 Hydrofluoric Acid (HF). Highly corrosive to,eyes, skin, nose, throat, and lungs. Reaction to exposure,may be delayed by 24 hours or more. Provide ventilation to,limit exposure.,5.2.3 Hydrogen Peroxide (H2O2). Very harmful to eyes.,30% H2O2 can burn skin, nose, and lungs.,5.2.4 Nitric Acid (HNO3). Highly corrosive to eyes,skin, nose, and lungs. Vapors are highly toxic and can,cause bronchitis, pneumonia, or edema of lungs. Reaction to,inhalation may be delayed as long as 30 hours and still be,fatal. Provide ventilation to limit exposure. Strong,oxidizer. Hazardous reaction may occur with organic,materials such as solvents.,5.2.5 Sodium Hydroxide (NaOH). Causes severe damage,to eyes and skin. Inhalation causes irritation to nose,1885,throat, and lungs. Reacts exothermically with limited,amounts of water.,6.0 Equipment and Supplies.,6.1 Sample Collection and Preparation. The,following items are required for sample collection and,preparation:,6.1.1 Parr Acid Digestion Bomb. Stainless steel with,vapor-tight Teflon cup and cover.,6.1.2 Volumetric Pipets. 2- and 5-ml sizes.,6.1.3 Volumetric Flask. 50-ml polypropylene with,screw caps, (one needed per standard).,6.1.4 Funnel. Polyethylene or polypropylene.,6.1.5 Oven. Capable of maintaining a temperature of,approximately 105 EC (221 EF).,6.1.6 Analytical Balance. To measure to within 0.1,mg.,6.2 Analysis. The following items are required for,analysis:,6.2.1 Spectrophotometer and Recorder. Equipped with,an electrodeless discharge lamp and a background corrector,to measure absorbance at 193.7 nm. For measuring samples,having less than 10Fg As/ml, use a graphite furnace or vapor,generator accessory. The recorder shall match the output of,the spectrophotometer.,1886,6.2.2 Volumetric Flasks. Class A, 50-ml (one needed,per sample and blank), 500-ml, and 1-liter.,6.2.3 Volumetric Pipets. Class A, 1-, 5-, 10-, and,25-ml sizes.,7.0 Reagents and Standards.,Unless otherwise indicated, it is intended that all,reagents conform to the specifications established by the,Committee on Analytical Reagents of the American Chemical,Society, where such specifications are avai……
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