ASTM_D_4913_-_00_2011.pdf

Designation:D491300(Reapproved 2011)Standard Practice forDetermining Concentration of Hydrogen Sulfide by DirectReading,Length of Stain,Visual Chemical Detectors1This standard is issued under the fixed designation D4913;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the detection of hydrogen sulfidegas by visual chemical detectors.Included under visual chemi-cal detectors are:short-term detector tubes(1),2long-termdetector tubes(2),and length-of-stain dosimeters(3).Diffusiontubes are not included under this practice because they are notdirect reading,and spot tests are not included because of theirpoor accuracy.The sample results are immediately available byvisual observation,thus no analytical equipment is needed.1.2 This practice reflects the current state-of-the-art forcommercially available visual length-of-stain detectors forhydrogen sulfide.Any mention of a specific manufacturer inthe text or references does not constitute an endorsement byASTM.1.3 The values stated in SI units are to be regarded asstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD3686 Practice for Sampling Atmospheres to Collect Or-ganic Compound Vapors(Activated Charcoal Tube Ad-sorption Method)D4490 Practice for Measuring the Concentration of ToxicGases or Vapors Using Detector TubesD4599 Practice for Measuring the Concentration of ToxicGases or Vapors Using Length-of-Stain Dosimeters2.2 Other Documents:CFR 1910.1000 Federal Occupational Safety and HealthStandard Title 29,Part 1910.1000,Subpart Z,and Part1926.55,Subpart D4NIOSH Criteria for a Recommended Standard,OccupationalExposure to Hydrogen Sulfide,19775Threshold Limit Values for Chemical Substances in theWork Environment Adopted by the American Conferenceof Governmental Industrial Hygienists,latest issue62.3ANSI Standard:ANSI/ISEA 1021990(R1998)Gas Detector Tube Units-Short-Term Type for Toxic Gases and Vapors in WorkingEnvironments73.Terminology3.1 DefinitionsFor definitions of terms used in thismethod,refer to Terminology D1356.4.Summary of Practice4.1 In general,the length-of-stain visual detectors describedin this practice consist of a sealed glass tube filled with areactive chemical dispersed on a granular material or a paperstrip.This reactive material is sensitive to hydrogen sulfide andchanges color upon exposure to hydrogen sulfide gas.Thesedetectors are designed so that the length of the color change inthe tube is related to the concentration of hydrogen sulfideunder conditions of sampling volume or sampling time speci-fied by the manufacturer.These detectors are typically cali-brated by the manufacturer on an individual lot basis.Threegeneral types of detectors are in current use.1This practice is under the jurisdiction ofASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.04 on Workplace Air Quality.Current edition approved March 1,2011.Published March 2011.Originallyapproved in 1989.Last previous edition approved in 2005 as D4913-051.DOI:10.1520/D4913-00R11.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard practice.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4Code of Federal Regulations,available from the U.S.Government PrintingOffice Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401.5Available from National Technical Information Service(NTIS),5285 PortRoyal Rd.,Springfield,VA 22161,http:/www.ntis.gov.6Available from American Conference of Governmental Industrial Hygienists,Inc.(ACGIH),1330 Kemper Meadow Dr.,Cincinnati,OH 45240,http:/www.acgih.org.7Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.1 Short-Term Detector TubesA given volume of air(specified by the manufacturer)is pulled through the tube by apump in a time period on the order of 1 to 10 min.Thelength-of-stain is related to the amount of air sampled and thehydrogen sulfide concentration during the sample period.4.1.2 Long-Term Detector TubesThe air sample is pulledthrough the tube at a slower,constant flow r