Determinacion Del Sulfuro De Hidrogeno En El Aire

581 METHOD 6 - DETERMINATION OF SULFUR DIOXIDE EMISSIONS FROM STATIONARY SOURCES 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 Therefore, to obtain

from other methods in this part.

reliable results, persons using this methodshould have a thorough knowledge of at least the following additional test methods: Method 1, Method 2, Method 3, Method 5, and Method 8. 1.0 Scope and Application. 1.1 Analytes. CAS No. 7449-09-5 Applicability. Sensitivity 3.4 mg SO2/m3 (2.12 x 10-7 lb/ft3)

Analyte SO2 1.2

This method applies to the

measurement of sulfur dioxide (SO2) emissions from stationary sources. 1.3 Data QualityObjectives. 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. 2.1 A gas sample is extracted from the sampling point The SO2 and the sulfur trioxide, including

in the stack.

582 those fractions in any sulfur acid mist, are separated. SO2 fraction is measured by the barium-thorin titrationmethod. 3.0 4.0 Definitions. Interferences. 4.1 Free Ammonia. Free ammonia interferes with this [Reserved] The

method by reacting with SO2 to form particulate sulfite and by reacting with the indicator. If free ammonia is present

(this can be determined by knowledge of the process and/or noticing white particulate matter in the probe and isopropanol bubbler), alternative methods, subject tothe approval of the Administrator are required. One approved

alternative is listed in Reference 13 of Section 17.0. 4.2 Water-Soluble Cations and Fluorides. The cations

and fluorides are removed by a glass wool filter and an isopropanol bubbler; therefore, they do not affect the SO2 analysis. When samples are collected from a gas stream with

high concentrations of metallic fumes (i.e.,very fine cation aerosols) a high-efficiency glass fiber filter must be used in place of the glass wool plug (i.e., the one in the probe) to remove the cation interferent. 5.0 Safety.

583 5.1 Disclaimer. This method may involve This test

hazardous materials, operations, and equipment.

method may not address all of the safety problems associated with its use. It is the responsibility of theuser to

establish appropriate safety and health practices and determine the applicability of regulatory limitations before performing this test method. 5.2 hazardous. Corrosive reagents. The following reagents are

Personal protective equipment and safe If

procedures are useful in preventing chemical splashes.

contact occurs, immediately flush with copious amounts of water for at least15 minutes. and decontaminate. burns. 5.2.1 Hydrogen Peroxide (H2O2). Irritating to eyes, Remove clothing under shower

Treat residual chemical burns as thermal

skin, nose, and lungs. agent.

30% H2O2 is a strong oxidizing

Avoid contact with skin, eyes, and combustible Wear gloves when handling. Sodium Hydroxide (NaOH). Causes severe damage

material. 5.2.2

to eyes and skin.throat, and lungs. amounts of water. 5.2.3 body tissue.

Inhalation causes irritation to nose, Reacts exothermically with limited

Sulfuric Acid (H2SO4).

Rapidly destructive to Eye damage may

Will cause third degree burns.

result in blindness.

Inhalation may be fatal from spasm of

584 the larynx, usually within 30 minutes. tissue damage with edema. May cause lung

1 mg/m3 for 8hours will cause Provide

lung damage or, in higher concentrations, death. ventilation to limit inhalation. metals and organics. 6.0 Equipment and Supplies. 6.1 Sample Collection.

Reacts violently with

The following items are

required for sample collection: 6.1.1 Sampling Train. A schematic of the sampling The sampling equipment

train is shown in Figure 6-1.

described in Method 8...