ASTM D2866-94 活性炭的总灰分含量的标准测试方法

Designation:D2866–94(Reapproved2004)

Standard Test Method for

Total Ash Content of Activated Carbon1

This standard is issued under the?xed designation D2866;the number immediately following the designation indicates the year of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon(e)indicates an editorial change since the last revision or reapproval.

1.Scope

1.1This test method describes a procedure for the determi-nation of total ash content of activated carbon.

1.2This standard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of this standard to establish appro-priate safety and health practices and deterrmine the applica-bility of regulatory limitations prior to use.

2.Referenced Documents

2.1ASTM Standards:2

D2867Test Methods for Moisture in Activated Carbon

E177Practice for Use of the Terms Precision and Bias in ASTM Test Methods

E691Practice for Conducting an Interlaboratory Study to Determine Precision of a Test Method

3.Summary of Test Method

3.1An accurately weighed sample of dried activated carbon is placed in a controlled-temperature muffle furnace for a period of several hours.When constant weight has been achieved,the crucible is cooled to ambient temperature in a desiccator and reweighed.The weight of the ashed carbon is expresesed as a percentage of the weight of the original carbon sample.

4.Signi?cance and Use

4.1In speci?c end uses,the amount and composition of the ash may in?uence the capabilities and certain desired proper-ties of activated carbon.

5.Apparatus

5.1Muffle Furnace,having air circulation,capable of tem-perature regulation of625°C at650°C.

5.2High-Temperature Crucible,high-form.

5.3Analytical Balance,having a sensitivity of0.1mg. 5.4Desiccator.

5.5Oven,forced-air circulation,capable of temperature regulation between145and155°C.

6.Procedure

6.1Ignite the crucible in the muffle furnace at650625°C for1h.Place the crucible in the desiccator.Cool to room temperature and weigh to the nearest0.1mg.

6.2Dry an adequate sample of activated carbon to constant weight at15065°C(3h is usually sufficient).

N OTE1—Some carbons can ignite spontaneously at150°C.In this case, moist carbon should be used with a correction for moisture(in accordance with Methods D2867)applied in the calculations.In this case,the ashing should be started in a cold muffle furnace.

6.3Weigh out to the nearest0.1mg sufficient dried acti-vated carbon,so that the estimated amount of ash will be0.1g, into the ignited crucible and place the crucible in the furnace at 650625°C.Ashing will require from3to16h,depending on the size and type of activated carbon.Ashing can be considered complete when constant weight is achieved.

6.4Place the crucible in the desiccator and allow to cool to room temperature.After the sample has cooled in the desicca-tor,admit air slowly to avoid loss of ash from the crucible. Weigh to the nearest0.1mg.

7.Calculation

7.1Calculate the ash content as follows:

Total ash,%5[~D2B!/~C2B!#3100(1) where:

B=weight of crucible,g,

C=weight of crucible plus original sample,g,and

D=weight of crucible plus ashed sample,g.

8.Precision and Bias3

8.1Precision:

8.1.1Interlaboratory Test Program—An interlaboratory study was run in which representative samples of three types of

1This test method is under the jurisidiction of ASTM Committee D-28on Activated Carbon and is the direct responsibility of Subcommittee D28.04on Gas Phase Evaluation Tests.

Current edition approved April1,2004.Published June2004.Originally approved https://www.wendangku.net/doc/0617326555.html,st previous edition approved in1999as D2866–94(1999).

2For referenced ASTM standards,visit the ASTM website,https://www.wendangku.net/doc/0617326555.html,,or contact ASTM Customer Service at service@https://www.wendangku.net/doc/0617326555.html,.For Annual Book of ASTM

Standards volume information,refer to the standard’s Document Summary page on the ASTM website.

3Supporting data have been?led at ASTM International Headquarters and may be obtained by requesting RR:D28-1004.

1

Copyright?ASTM International,100Barr Harbor Drive,PO Box C700,West Conshohocken,PA19428-2959,United States.

activated carbon (coconut-shell based (A ),coal-based (B ),and wood-based (C ))were testerd for ash content by six laborato-ries with each laboratory making three observations of each activated carbon type over three days.Practice E 691was followed for the design and analysis of the data.

8.1.2Test Result —The precision information given in Table 1in units of measurement (percent minus weight ash content)is for the comparison of two test results,each of which is the average of three test determinations.

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TABLE 1Precision

Material

A B C Average Test Value

7.74 1.88 4.6195%Repeatability Limit A

(Within Laboratory)

0.270.220.2295%Reproducibility Limit A

(Between Laboratories)

0.41

0.54

0.48

A

The terms repeatability limit and reproducibility limit are used in accordance with Practice E 177.The respective standard deviations among test results may be obtained by dividing the above

limit values by 2.8.