ASTM D6699-2001(2010) 1875 Standard Practice for Sampling Liquids Using Bailers《用水斗取液体样的标准操作规程》.pdf

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1、Designation: D6699 01 (Reapproved 2010)Standard Practice forSampling Liquids Using Bailers1This standard is issued under the fixed designation D6699; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb

2、er 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 procedure for sampling strati-fied or un-stratified waters and liquid waste using bailers.1.2 Three specific baile

3、rs are discussed in this practice. Thebailers are the single and double check valve and differentialpressure.1.3 This standard does not cover all of the bailing devicesavailable to the user. The bailers chosen for this practice aretypical of those commercially available.1.4 This practice should be u

4、sed in conjunction with GuideD4687, Practice D5088, and Practice D5283.1.5 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 th

5、e applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D4448 Guide for Sampling Ground-Water MonitoringWellsD4687 Guide for General Planning of Waste SamplingD4750 Test Method for Determining Subsurface LiquidLevels in a Borehole or Monitoring Well (Observ

6、ationWell)3D5088 Practice for Decontamination of Field EquipmentUsed at Waste SitesD5283 Practice for Generation of Environmental Data Re-lated to Waste Management Activities: Quality Assuranceand Quality Control Planning and ImplementationD5681 Terminology for Waste and Waste ManagementD5792 Practi

7、ce for Generation of Environmental Data Re-lated to Waste Management Activities: Development ofData Quality ObjectivesD6051 Guide for Composite Sampling and Field Subsam-pling for Environmental Waste Management ActivitiesD6232 Guide for Selection of Sampling Equipment forWaste and Contaminated Media

8、 Data Collection ActivitiesD6517 Guide for Field Preservation of Ground-WaterSamplesD6564 Guide for Field Filtration of Ground-Water SamplesD6634 Guide for the Selection of Purging and SamplingDevices for Ground-Water Monitoring Wells2.2 EPA Standard:EPA SW 486 RCRA Samples3. Terminology3.1 See Term

9、inology D5681.4. Summary of Practice4.1 A clean bailer is lowered into the liquid to be sampledusing a suspension line (see Fig. 1). The bailer chamber isallowed to fill with the sample. The check valve or valves on1This practice is under the jurisdiction of ASTM Committee D34 on WasteManagement and

10、 is the direct responsibility of Subcommittee D34.01.03 onSampling Equipment.Current edition approved Dec. 1, 2010. Published January 2011. Originallyapproved in 2001. Last previous edition approved in 2006 as D6699-01 (2006).DOI: 10.1520/D6699-01R10.2For referenced ASTM standards, visit the ASTM we

11、bsite, 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.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.FIG. 1 Bailer S

12、ampling a Screened Well1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.bailers close when the bailer stops. The bailer is raised to thesurface where the sample is discharged into a clean sampleconfiner.5. Significance and Use5.1 A ba

13、iler is a device for obtaining a sample fromstratified or un-stratified waters and liquid wastes. The mostcommon use of a bailer is for sampling ground water fromsingle-screened wells (Fig. 1) and well clusters (see GuideD4448).5.2 This practice is applicable to sampling water and liquidwastes. The

14、sampling procedure will depend on sampling planand the data quality objectives (DQOs) (Practice D5792).5.3 Bailers may be used to purge ground water wells prior tosampling, but bailers are poor devices for removing largevolumes of water.5.4 Bailers may be used to sample waters and liquid wastesin un

15、derground and above ground tanks and surface impound-ments. However, the design of the unit and associated pipingshould be well understood so that the bailer can access thedesired compartment and depth. Any stratification of the liquidshould be identified prior to sampling.NOTE 1Viscous liquids and

16、suspended solids may interfere with abailers designed operation.5.5 Bailers do not subject the sample to pressure extremes.Bailing does disturb the water column and may cause changesto the parameters to be measured (for example, turbidity, gases,etc.).6. Sampling Equipment6.1 Bailers are versatile d

17、evices constructed in differentsizes and from a variety of materials. Some bailers aredesigned using a threaded section that allows the user tochange the volume of the bailer by connecting additionalsections. When sampling for volatile organic compounds(VOCs) in liquids, specialized bailers that hav

18、e a samplecontrol or a draft valve near the bottom of the bailer are used.The control valve allows a sample to be drained from the bailerwith minimal loss of volatile compounds.6.2 Three general types of bailers are a single check valvebailer, a double check valve bailer, and a differential pressure

19、bailer (hydrostatic pressure allows the bailer to fill through thelower tube and release displaced air through the upper tube).Advantages and limitations of bailers are found in GuidesD6232 and D6634. A description of the equipment and theadvantages and limitations of bailers in general and specific

20、limitations of the single and double check valve bailers and thedifferential pressure bailer are as follows:6.2.1 General Description and Advantages and Limitationsof Bailers:6.2.1.1 Bailers are available commercially in differentlengths, volumes, and check valve density and sample releasearrangemen

21、ts. They are typically constructed of PTFE, poly-vinyl chloride (PVC), stainless steel, and polyethylene (singleuse disposable bailer).6.2.1.2 General advantages and limitations of bailers arelisted in Table 1.6.2.2 Single Valve Bailer (Fig. 2):6.2.2.1 Asingle check valve bailer is a length of tubin

22、g witha check valve in the bottom. The bottom valve allows the bailerto fill and retain the sample.6.2.2.2 The bottom-emptying bailers with controlled flowvalves (Fig. 3) are used for collecting samples for volatileorganic analyses.6.2.2.3 AdvantagesLow initial cost, and it is mechani-cally simple.6

23、.2.2.4 LimitationsApplicable to surface sampling only,disturbs the sample, and exposes the samples to the atmo-sphere.6.2.3 Double Valve Bailers (Fig. 4):6.2.3.1 A double check valve bailer has an additional checkvalve at the top of the body that allows sampling at a specificdepth. As the bailer is

24、lowered through the liquid column, theliquid flows through the bailer until the sampling level isreached. At the sampling point, the two check valves close tocontain the sample. Because the difference between each balland check valve seat is the same, both check valves closesimultaneously upon retri

25、eval. The valve from the valve seat ismaintained by a pin that blocks vertical movement of the checkball. A drainage pin is placed into the bottom of the bailer todrain the sample directly into a sample bottle.TABLE 1 General Advantages and Limitations of BailersAdvantages LimitationsSimple to use T

26、ime consuming to useSome have a low initial cost Valves may leakCan be made almost any size Tend to expose sample to theatmosphereCan be constructed of a varietyof materialsMay result in samplecontaminationNo external power sourceneededBailers are not suitable forsampling thin surface layerslike thi

27、n layers of light non-aqueous phase liquidsFIG. 2 Single Valve BailerD6699 01 (2010)26.2.3.2 AdvantageIt can sample at any point in a liquidcolumn.6.2.3.3 LimitationIt can become contaminated with theoverlaying material as the sampler approaches the targetedsampling point.6.2.4 Differential Pressure

28、 Bailer (Fig. 5):6.2.4.1 The differential pressure bailer is a canister with twosmall diameter tubes of different heights built into the remov-able top. It is usually made from stainless steel to providesufficient weight to allow it to be lowered rapidly to the desiredsampling depth. Once the bailer

29、 is stopped, hydrostatic pres-sure allows the bailer to fill through the lower tube at the sametime as air is displaced through the upper tube.6.2.4.2 AdvantagesThere is a minimal cross contamina-tion from the matrix so samples are more likely to berepresentative at depth. They are good for sampling

30、 for VOCsbecause they minimize contact with air.6.2.4.3 LimitationsDifficulty of cleaning the equipment,high cost due to the complexity of the device, relative smallsample size compared to other bailers, the required rapidlowering of the bailer may disturb the sample matrix, and crosscontamination f

31、rom potential leakage of the upper liquid layersinto the bailer during descent.6.3 Figs. 6 and 3 show devices used to drain samples fromthe bailers. These devices are hollow tubes pushed into thebottom of the bailer raising the check valve and allowing thesample to drain into the sample container. T

32、he device in Fig. 6regulates sample flow by controlling how high the check valveis raised. The Fig. 3 emptying device controls sample flowusing a separate valve.7. Pre-Sampling7.1 A sampling plan must be in place.7.2 The depth at which the sample is taken must be known.The depth is measured from a r

33、eference point (datum) on a wellcasing, tank sampling port or manhole, stream gage or othermeasuring device for rivers and ponds. Whenever possible, thereference point should be surveyed.7.3 The distance from the reference point to the top of theliquid should be measured and recorded. If there is an

34、 interfaceto be sampled, the top and bottom of the interface needs to bedetermined. Test Method D4750 is a good reference fordetermining the interface levels.7.4 The sampling plan should consider special samplehandling like preservation (see Guide D6517 for preservationof ground-water samples and SW

35、 846 for RCRA samples),filtration, if required (see Guide D6564 for field filtration ofground-water), and field compositing (see Guide D6051).7.5 A pail or other suitable container can be used forstorage, payout, and retrieval of the suspension line.7.6 Confirm that adequate sample labels, security

36、seals,appropriate storage containers, field logbooks, ice if required,chain-of-custody forms, and the like, are available.FIG. 3 Bailer Emptying DeviceFIG. 4 Double Valve BailerFIG. 5 Differential Pressure BailerD6699 01 (2010)38. General Procedure for Using Bailers8.1 The sampler and suspension lin

37、e is to be clean and freefrom other contaminating materials that could be carried intothe hole.8.2 The suspension line should be measured and marked tothe depth required for the desired sample. The measurement tothe point where the sample is taken must be from the referencepoint.NOTE 2It is extremel

38、y important to secure the end of the suspensionline to a fixed object prior to lowering the bailer into a well or unit so thatit may not be accidentally lost during the sampling event.8.3 A clean pail or other clean container should be used tocontain the suspension line during the lowering and retri

39、evalprocess.8.4 The surface around the sampling site should be clean aspossible.NOTE 3A polyethylene sheet can be an effective method to protectboth the sampling equipment and the area surrounding the well fromcontamination from sampling spills.8.5 The bailer is attached to the suspension line and l

40、oweredinto the liquid to be sampled.8.6 The bailer is raised to the surface, the outside wiped, andits contents emptied into labeled sample containers and stored.NOTE 4It is advisable to use a disposable wipe or equivalent to cleanthe suspension line and bailer during the retrieval process when samp

41、linga material known to be hazardous.9. Bailer Procedures by Type9.1 Single Check Valve Bailer (Top-Emptying and Bottom-Emptying) Procedure:9.1.1 Attach the suspension line to a clean bailer and gentlylower the bailer to the desired depth usually just below thesurface. The sample will enter the cham

42、ber through the bottomupon reaching the sampling surface.9.1.1.1 The lowering rate should minimize disturbance tothe medium to be sampled.9.1.1.2 The check ball will seat when the bailer stops itsdownward movement and will remain closed as long as thereis no downward movement during retrieval.9.1.2

43、Retrieval of the bailer must be slow and continuous.9.1.2.1 As the bailer is being retrieved, the suspension lineis wiped.9.1.3 The outside of the bailer is wiped.9.1.4 Transfer the bailer contents into a clean labeledsample container by pouring the contents slowly from the topof the bailer or from

44、the bottom using bailer emptying devicessuch as those found in Figs. 6 and 3.NOTE 5If the bailer being emptied from the top, rapid emptying maycause the check valve to accidentally release, spilling the contents.9.1.4.1 Bottom-emptying bailers using controlled flowvalves are used to collect samples

45、for volatile organic analyses(VOA). The sample is discharged from the bottom through acontrolled flow valve into the VOA vial.9.2 Double Check Valve Procedure:9.2.1 Attach the suspension line to the bailer.9.2.2 Lower the bailer to the predetermined sampling depthat a steady rate that will minimize

46、the disturbance to the liquidto be sampled.9.2.3 Slowly and continuously raise the bailer, cleaning thesuspension line as it is being retrieved.9.2.4 The outside of the bailer is wiped.9.2.5 Insert the vacuum release pin (see Fig. 4) and attachthe bottom emptying device or drainage pin. Discharge th

47、esample into a labeled sample container.9.3 Differential Pressure Bailer Procedure:9.3.1 The suspension line is attached to the bailer and thebailer is allowed to sink quickly to the desired depth.9.3.2 The bailer should remain at depth until it is filled.NOTE 6The length of time to fill depends upo

48、n the sample matrix(usually less than a minute).9.3.3 Retrieve the bailer while wiping the suspension line.9.3.4 The outside of the bailer is wiped.9.3.5 Empty the contents into a clean sample container.10. Post Sampling10.1 Check the following: sample bottles for the correctlabeling, chain-of-custo

49、dy for completeness. If required,sample container for adequate cooling and completeness of thefield logs (see Practice D5283).10.2 Decontaminate the equipment in accordance with Prac-tice D5088.NOTE 7The differential pressure bailer requires additional care toensure that all parts of the device, including the air escape and sampleentry tubes, are clean.10.3 Dispose of non-reusable equipment properly.11. Keywords11.1 bailer; ground water; liquid sampling; sampling wasteFIG. 6 Bailer Emptying DeviceD6699 01 (2010)4ASTM International takes no position respecting the val