EPA Method 108B Determination Of Arsenic Content In Ore Samples From Nonferrous Smelters
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ID： |
C82BF31547194687A881320BB858C42F |
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文件大小(MB)： |
0.03 |
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页数： |
9 |
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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）：
1900,METHOD 108B - 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 this appendix and in Appendix A to 40,CFR Part 60. Therefore, to obtain reliable results, persons,using this method should have a thorough knowledge of at,least the following additional test methods: Method 12 and,Method 108A.,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,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. Samples resulting in an analytical,concentration greater than 10 μg As/ml may be analyzed by,this method. For lower level arsenic samples, Method 108C,should be used.,1901,1.3 Data Quality Objectives. Adherence to the,requirements of this method will enhance the quality of the,data obtained from air pollutant sampling methods.,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 11.4).,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.,1902,If contact occurs, immediately flush with copious amounts of,water for at least 15 minutes. Remove clothing under shower,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 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.,5.2.4 Perchloric Acid (HClO4). Corrosive to eyes,skin, nose, and throat. Provide ventilation to limit,exposure. Very strong oxidizer. Keep separate from water,1903,and oxidizable materials to prevent vigorous evolution of,heat, spontaneous combustion, or explosion. Heat solutions,containing HClO4 only in hoods specifically designed for,HClO4.,6.0 Equipment and Supplies.,6.1 Sample Preparation. The following items are,required for sample preparation:,6.1.1 Teflon Beakers. 150-ml.,6.1.2 Graduated Pipets. 5-ml disposable.,6.1.3 Graduated Cylinder. 50-ml.,6.1.4 Volumetric Flask. 100-ml.,6.1.5 Analytical Balance. To measure within 0.1 mg.,6.1.6 Hot Plate.,6.1.7 Perchloric Acid Fume Hood.,6.2 Analysis. The following items are required for,analysis:,6.2.1 Spectrophotometer. Equipped with an electrodeless,discharge lamp and a background corrector to,measure absorbance at 193.7 nm.,6.2.2 Beaker and Watch Glass. 400-ml.,6.2.3 Volumetric Flask. 1-liter.,6.2.4 Volumetric Pipets. 1-, 5-, 10-, and 25-ml.,7.0 Reagents and Standards.,1904,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 available; otherwise,use the best available grade.,7.1 Sample Preparation. The following reagents are,requi……
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