ASTM E410-2017 7048 Standard Test Method for Moisture and Residue in Liquid Chlorine《液氯中水和残渣的标准试验方法》.pdf

1、Designation: E410 17Standard Test Method forMoisture and Residue in Liquid Chlorine1This standard is issued under the fixed designation E410; 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 pa

2、rentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers the determination of moistureand residue in liquid chlorine. Lower limits of detection of 10g/g based on a 150-mL sample a

3、re achievable.1.2 This test method describes operations and special appa-ratus for sampling liquid chlorine from cylinders. Samplingother commercial facilities such as tank cars, barges, andstorage tanks require special techniques of manipulation infilling sample cylinders for testing. If conditions

4、 and facilitiesare favorable, the analysis apparatus may be connected directlyto these larger storage and transportation units and on-the-spottests may be completed.1.3 The analytical methods are empirical and are gravimet-ric. They are applicable to the determination of the residue andmoisture cont

5、ent of commercial grades of liquid chlorine(condensed gaseous product).1.4 Residue is defined as being those substances whichremain in the sample flask after sample volatilization under theconditions of the test. Moisture is defined as the volatilesubstances evolved during volatilization and purging

6、 of thesample-residue flask and absorbed on the desiccant containedin the absorption tubes under the conditions of the test. Someof the volatile chlorinated hydrocarbons may also be evolvedfrom the sample residue flask during purge and absorbed, thuscontributing to the apparent moisture analysis val

7、ue.1.5 This test method may be used for determining themoisture content only of gaseous chlorine if suitable andappropriate modifications are made for sample measurementand calculation.1.6 Review the current Safety Data Sheet (SDS) for detailedinformation concerning toxicity, first aid procedures, a

8、nd safetyprecautions.1.7 The values stated in inch-pound units are to be regardedas the standard. No other units of measurement are included inthis standard.1.8 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user o

9、f this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Specific hazardsstatements are given in Section 7.2. Referenced Documents2.1 ASTM Standards:2E180 Practice for Determining the Precision of ASTMMethods for A

10、nalysis and Testing of Industrial and Spe-cialty Chemicals (Withdrawn 2009)32.2 Federal Standards:4CFR 173 Title 49 Transportation; Shippers General Re-quirements for Shipments and Packagings, including Sec-tions:173.304 Charging of Cylinders with Liquefied CompressedGas173.314 Requirements for Comp

11、ressed Gases in Tank Cars173.315 Compressed Gases in Cargo Tanks and PortableTank Containers3. Summary of Test Method3.1 Acommon liquid sample of chlorine is recommended toprovide the best results when determining both residue andmoisture simultaneously.3.2 Liquid product sample is transferred from

12、the samecylinder into a precalibrated, 250-mL sample-residue flask andpermitted to volatilize completely under prevailing environ-mental conditions. The volatilized product (chlorine gas) ispassed through anhydrous magnesium perchlorate desiccantfor absorption of moisture. It is recommended that the

13、 exhaustgas be discharged into a caustic scrubber containing anappropriate amount of 20 % caustic solution to neutralize allthe chlorine. This reaction is exothermic and care should be1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and

14、is the direct responsibility ofSubcommittee D16.16 on Industrial and Specialty Product Standards.Current edition approved March 1, 2017. Published March 2017. Originallyapproved in 1970. Last previous edition approved in 2008 as E410 08. DOI:10.1520/E0410-17.2For referenced ASTM standards, visit the

15、 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from U.

16、S. Government Printing Office, Superintendent ofDocuments, 732 N. Capitol St., NW, Washington, DC 20401-0001, http:/www.access.gpo.gov.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.

17、United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barr

18、iers to Trade (TBT) Committee.1taken to avoid excess heating by choosing a sufficiently largevolume of caustic solution to serve as a heat sink.3.3 After complete volatilization of the sample from theflask, residual chlorine and moisture are expelled from anyresidue by purging with dry air through t

19、he absorption systemwhere moisture is recovered and determined gravimetrically.3.4 Residue remaining in the flask is determined by carefulanalytical weighing, the weight gain calculated as residuecontent of the sample. Moisture is computed from the sum ofthe gain in weight of the two absorption tube

20、s containing thedesiccant. Any gain in weight of the second absorber tubeshould be nominal with respect to that of the first tube in theseries.3.5 The moisture content of a chlorine gas stream isdetermined gravimetrically as above, by passing a meteredsample through the moisture absorption system on

21、ly.4. Significance and Use4.1 This test method provides for the determination ofmoisture and residue in liquid chlorine. The concentrationlevels of these impurities are important factors in manycommercial uses of liquid chlorine.5. Apparatus5.1 The arrangement and assembly of apparatus for collec-ti

22、on and measurement of the analytical sample and volatiliza-tion is shown in Fig. 1.5.2 Sample-Residue Flask (H), Erlenmeyer-type, 250-mLcapacity, equipped with a 35/20 JSground-ball joint.5Apermanent calibration mark shall be inscribed on the flask atthe 150-mL volume level for sample measurement.5.

23、3 Adapter (G), equipped with a 35/20 JSground-socketjoint attached and sealed as shown in Fig. 1. In addition,appropriate 12/5 JSjoints shall be sealed to the adapter. A balljoint, sealed and closed off at the end, shall be provided forattachment to the inlet tube after collection of liquid sample i

24、nthe sample-residue flask. This shall be held in position with anappropriate clamp during volatilization, then removed andreplaced with appropriate connections from the metered dry-airsupply at the time of aeration and purge of the sample-residueflask.5.4 A second assembly consisting of a sample-res

25、idue flaskand adapter shall be used to facilitate collection and disposal ofsample purge from the cylinder sample line prior to withdrawalof the analytical sample for test.5.5 RegulatorAn appropriate needle valve type shall beattached to the cylinder outlet to control and regulate the flowof liquid

26、chlorine from the sample cylinder. Connection (F )between the outlet from this valve and the adapter (G) shall beby a short length of appropriately sized TFE-fluorocarbontubing equipped with a 12/5 JSground-ball joint.5.6 Rubber Tubing, length and size sufficient to exhaustchlorine vapors to the cau

27、stic soda absorber or hood systemduring sample collection and volatilization. A ground-glass12/5 JSsocket joint shall be fitted to one end of the rubbertubing to make appropriate connection to the adapter duringsample collection and transferred to the exhaust connectionfrom the second moisture absor

28、ption U-tube for gas dischargeto disposal during volatilization of the sample.5.7 Watch Glass, small size, used to close the sample-residue flask during analytical weighing before and aftersample volatilization to prevent loss of residue or absorption ofmoisture from the atmosphere.5.8 Moisture Abso

29、rption Tubes (I) (Fig. 1)SchwartzU-tube design, 100 mm length top of arms to center, modifiedand equipped with ground-glass 12/5 JSsocket and ball jointssealed to the inlets and outlets. Two such absorber tubes shallbe connected in a series arrangement.5.9 Flow Meter, capable of metering air at 4.5

30、L/min andequipped with appropriate ground glass connection.5.10 Caustic Scrubber, for chlorine disposal.5The recommended sample-residue flask, equipped with a 35/20 JSground-balljoint and the adapter equipped with a 35/20 JSground-socket joint and associated12/5 JSground joints shown in Fig. 1, can

31、be purchased from a reputable glass vendoror can be fabricated by a glass blower.FIG. 1 Apparatus for Collection and Volatilization of Liquid ChlorineE410 1726. Reagents6.1 Purity of ReagentsUnless otherwise indicated, it isintended that all reagents should conform to the specificationsof the Commit

32、tee on Analytical Reagents of the AmericanChemical Society, where such specifications are available.66.2 Pulverized Dry Ice and a Small Amount ofTrichloroethylene, contained in a glass crystallizing dish (190by 100 mm), for use in cooling the sample-residue flask duringsample purge, collection and m

33、easurement.6.3 Granular Form of Anhydrous Magnesium PerchlorateReagent Grade.6.4 Caustic Solution20 % by mass, sodium hydroxide inwater. Dissolve 200 g of sodium hydroxide (NaOH) in waterand dilute to 1 L. Store in a tight polyethylene container.7. Hazards7.1 Chlorine is a corrosive and toxic materi

34、al. A wellventilated fume hood should be used to house the test equip-ment when this product is analyzed in the laboratory.7.2 The analysis should be attempted only by persons whoare thoroughly familiar with the handling of chlorine, and evenan experienced person should not work alone. The operatorm

35、ust be provided with adequate eye protection and respirator.Splashes of liquid chlorine destroy clothing and if suchclothing is next to the skin, will produce irritations and burns.7.3 When sampling and working with chlorine out of doors,people downwind from such operation should be warned of thepos

36、sible release of chlorine vapors.7.4 It is recommended that means should be available fordisposal of excess chlorine in an environmentally safe andacceptable manner. If chlorine cannot be disposed of in achlorine consuming process, a chlorine absorption systemshould be provided. When the analysis an

37、d sampling regimenrequires an initial purging of chlorine from a container, thepurged chlorine should be similarly handled. Purging to theatmosphere should be avoided.7.5 In the event chlorine is inhaled, first aid should besummoned immediately and oxygen administered withoutdelay.8. Sampling Tank C

38、ars, Barges, Large Cylinders, andStorage Facilities8.1 Sampling from tank cars, barges, storage tanks, andlarge cylinders present unique problems. Each facility,however, must be capable of delivering liquid-sample (not gas)for test.8.2 Since location of these larger facilities may not be at theimmed

39、iate site of analysis, sample collection in a suitablesecondary container is recommended to facilitate its safetransport to the laboratory for tests.8.3 It is recommended that samples be collected from thesefacilities in small-size sample cylinders with cylinders andvalves fabricated of tantalum or

40、nickel and capable of beingnegotiated in the laboratory fume hood. Technical literatureavailable from producers and distributors of liquid chlorineshould be consulted for instructions in filling small sizecylinders properly from bulk storage.8.4 Do not allow the sample cylinder to become liquid full

41、.A good rule is that the weight of the chlorine in the cylindershould not be more that 125 % of the weight of the water thatthe cylinder could contain in accordance with 49 CFR 173.9. Preparation of Apparatus9.1 Thoroughly clean the absorption tubes, sample-residueflasks, and adapters free of grease

42、 and lubricants, particularly atthe ground surfaces of the joints.After thorough cleansing, drythe apparatus thermally in an oven at 105C. When cooled,charge the absorption tubes with desiccant.9.2 Charge each tube within about 20 mm of the top in eachleg with a granular form of anhydrous magnesium

43、perchlorate,minimizing the use of dusty product. Place loosely packedglass wool on the surfaces of the desiccant in both legs of theabsorber tube to avoid carry-over of chemical dust duringsample volatilization and air purge operations. Place theunlubricated stoppers firmly in the ground necks of th

44、e tubesand adjust to the “off” position preparatory to conditioningwith chlorine gas, air purge, and weighing.9.3 Connect the moisture absorption tubes in a series bymeans of appropriately sized spring clamps in an uprightoperating position supported on a ring stand.Attach the groundjoint and rubber

45、 tubing to the outlet of the second absorber forexhausting chlorine gas to the caustic scrubber.9.4 Attach a source of chlorine gas to the inlet of the firstabsorber tube, open the ground stoppers on both tubes topermit the free flow of gas through them and purge for1hata rate of 2 to 3 bubbles of c

46、hlorine gas/s when the exhaust endof the rubber tube is held momentarily beneath the surface ofwater.9.5 After purging with chlorine (see Section 10), attach thedry air supply to the first absorber in the series and aerate forexactly 5 min at a rate of 4.5 L/min.9.6 After aeration, carefully close t

47、he ground stoppers,dismantle the tubes from the assembly, and condition in theenvironment of the balance for 10 min prior to analyticalweighing of each tube. After weighing, the tubes may bereassembled for the next analysis.9.7 Conditioning of the absorber tubes with chlorine isrequired after an ini

48、tial fresh charge of desiccant only.Aerationis required following volatilization of the sample for each test.If the second tube contains 25 % of the total weight gain, thetubes need to be refilled.10. Drying Tower and Aeration10.1 The arrangement and assembly of apparatus used inaerating the equipme

49、nt after volatilization includes a drying6Reagent Chemicals, American Chemical Society Specifications, AmericanChemical Society, Washington, DC. For suggestions on the testing of reagents notlisted by the American Chemical Society, see Analar Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.E410 173tower, flow meter capable of metering air at 4.5 L/min, andappropriate JSground connection.10.2 Construct the drying tower for conditioning air us