ASTMDE!385BLm075953000784977m4lbDesignation:D2385-81(Reapproved1990)AnAm&canNationalStandardStandardTestMethodforHydrogenSulfideandMercaptanSulfurinNaturalGas(CadmiumSulfatelodometricTitrationMethod)’ThisstandardisissuedunderthefixeddesignationD2385;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(t)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofhy-drogensulfideandmercaptansulfurinnaturalgas.Itisapplicableovertheconcentrationrangefrom0to5grainsofhydrogensulfide(about11mg/m3)and0to1grainofmercaptansulfur/100ft3(2.832m3)ofnaturalgas.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,tfany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocument2.1ASTMStandard:D1193SpecificationforReagentWater23.SummaryofTestMethod3.1Ameasuredvolumeofnaturalgasisbubbledthroughneutralcadmiumsulfatesolutiontoremovehydrogensul-fide,andthenthroughbasiccadmiumsulfatetoscruboutthemercaptans.Theamountsofhydrogensulfideandmercaptansulfurintheabsorbersarethendeterminediodometrically.4.SignificanceandUse4.1Naturalgasanditsproductsofcombustionmustnotbeundulycorrosivetothematerialswithwhichtheycomeincontactandthemeasureofhydrogensulfideandothersulfurcompoundsisimportant.Inaddition,insomecasestheodorofthegasmustnotbeobjectionableandfromthisstand-pointthemeasurementofmercaptansulfurissignificant.5.Apparatus5.1GasWashingBottle-Abottlewithsideinlet,coarse-porosityfiitteddisk(40to60pmmaximumporesize),and24/40outerjointattheoutlet.Thediameterofthefritteddiskis60mm,andtheapproximateoutsidediameterandheightare70and280mm,respectively.35.2SprayTraps,with20140innerjoint,foruseonthetThistestmethodisunderthejurisdictionofASTMCommitteeD-3onGaseousFuelsandisth...
