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1、UDC 539.21 5.2:539.215 JIS JAPANESE INDUSTRIAL STANDARD Determination of particle size distribution by the sedimentation in liquid using the pipette apparatus JIS Z 8821-1990 4 A- %&. Translated and Published by Japanese Standards Association Printed in Japan 4s Copyright Japanese Standards Associat
2、ion Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 22:02:15 MSTNo reproduction or networking permitted without license from IHS -,-,- - J I S ZU8821 90 4933608 O082429 L E In the event of any doubt arising, the original Standard
3、in Japanese is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 22:02:15 MSTNo reproduction or networking permitted without license from IHS -,-,- 3 J I S Z*82L 90 M 4
4、933608 0082430 8 = - UDC 539.215.2:539.215 JAPANESE INDUSTRIAL STANDARD J I S Determination of particle size distribution by the sedimentation in liquid using the pipette apparatus Z 8821-1990 . . 1. Scotbe This Japanese Industrial Standard specifies the method using pipette apparatus ( l ) among th
5、e methods of determination of particle size distribution by the sediment- ation in liquid. Note ( l ) Disperse the suspension in sedimenting tube and then measure the temporal change of particle concentration in the defined depth by pippette. The applicable Standards for this Standard are shown as f
6、ollows. Remark: JIS R 3503-Glass Apparatus for Chemical Analysis JIS Z 8820-General Rules for the Determination of Particle Size Distribu- tion by Sedimentation in Liquid JIS 2 8901-Dusts and Aerosols for Industrial Testing 2. Definitions of Terms The main terms to be used in this Standard are defin
7、ed in JIS Z 8820 and JIS Z 8901. 3. Apparatus and Devices to be Used The apparatus and devices to be used shall be as shown in the following. Andreasen Pipette internal diameter of pipette capillary 1 to 1.5 mm, distance from base line at end of pipette capillary up to marked line of liquid surface
8、about 20 cm or 10 cm and suck up quantity of suspension at one time 10 cm3. An example is shown in Fig. 1. That with internal diameter of cylinder about 5 cm, Sample Suspension Dispersing Device ficiently the sample in the dispersing medium. That with function to disperse suf- Thermostat or Flowing
9、Water Bath of suspension in sedimenting tube. That able to hold the temperature Balance sensitivity looo g for the weighing of analytical sample. That in sensitivity & g for weighing of sample and that in Dryer Desiccator in function. That able to hold at 105 +_ 2C. That specified in JIS R 3503 or e
10、quivalent or superior to this Use silica gel as drying agent. Sample Receiver Stop Watch Beaker of capacity in the order of 20 to 30 cm3. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 22:
11、02:15 MSTNo reproduction or networking permitted without license from IHS -,-,- 2 Z 8821-1990 4. Measuring Method 4.1 Measurement of Reduction and True Density of Sample The measurement of reduction and true density of sample shall be as follows. (1) keduction of Sample The reducing method of sample
12、 shall comply with 6.1 (Reduction of sample) of JIS Z 8820. (2) True Density The measuring method of true density shall comply with 6.2 (Measuring method of true density of sample) of JIS Z 8820. 4.2 Method of Preparation of Dispersing Medium and Suspension The method of preparation of dispersing me
13、dium and suspension shall be as follows. (1) Dispersing Medium The method of preparation of dispersing medium shall comply with JIS Z 8820. (2) Suspension As for suspension, weigh the sample so as to be about 1 % in massdensity when the dispersing medium of (1) is put in up to the marked line of And
14、reasen pipette. to stir according to JIS Z 8820, then transfer to the sedimenting tube of Andreasen pipette, insert the capillary tube and put in the thermostat or flowing water bath. Mix this with dispersing medium 4.3 Measurement The measurement shall be as follows. (1) Shake by hand for about 2 m
15、in the Andreasen pippette having been put in with suspension prepared in 4.2 (2), at the same time of end of shaking stand still in the thermostat or flowing water bath and take this time as the time of beginning measurement(2). Note ( 2 ) Because there is initial disorder in the suspension in sedim
16、enting tube, it is preferable to conduct the first sucking up after the period of time 2 min or over has elapsed. (2) Take the height from base line up to liquid surface as h , , after the sedi- menting time t , defined corresponding to particle size x, has elapsed, operate the three way cock of pip
17、ette to suck up the defined volume of suspension and take in the sample receiving dish No. 1. Informative Reference: It is adequate that the sucking up speed is constant and the sucking up time is 10 to 20 s. (3) Hereafter in the same manner, take the height from base line up to liquid surface as hi
18、 and at the sedimenting time t, corresponding to particle size x , , take the i-th sample in the dish No. i. Dry the above samples in each, then weigh and subtract the mass of (4) dispersing agent contained in it. Take these values as m, m, . m I “-mn , 4.4 Calculation The calculation shall be condu
19、cted as follows. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 22:02:15 MSTNo reproduction or networking permitted without license from IHS -,-,- 3 Z 8821-1990 (1) Determine the sedimenti
20、ng time corresponding to particle size by the following formula. . (1) t. = 18,u hi x 102 I d P P - pi )Xi2 where, t, : sedimenting time (s) : viscosity of dispersing medium (Pa-s) h, : distance from base line up to liquid surface (m) ,op : true density of particle (kg/m3) pl : density of dispersing
21、 medium (kg/m3) . q : gravitational acceleration (m/sz) 3cl : particle size (pm) (2) Determine the integrated distribution corresponding to particle size by the following formula. . (2) QI =y ml V IM - - - - a where, Q, : integrated distribution V : volume of suspension put in the Andreasen pipette
22、M : mass of sample put in the Andreasen pipette (kg) u , : volume of sucked up suspension (m3) (m3) m, : mass of particles in sucked up suspension (kg) 5. Indicating Method of Measured Results The indicating method of measured results shall comply with 7. (Indicating method of measured results) of J
23、IS Z 8820. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 22:02:15 MSTNo reproduction or networking permitted without license from IHS -,-,- 1 J I S Z*8821 90 W 4933b08 0082433 3 4. Z 8821
24、-1990 Fig. 1. Example of Andreasen Pipette Pi Pipette sphere for sucking up Three way cock pette capillary tube Sed imentat ion tube 20crn marked l i n e Ocrn base line Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie
25、 Not for Resale, 03/10/2007 22:02:15 MSTNo reproduction or networking permitted without license from IHS -,-,- Z 8821-1990 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1990-07-01 Date of Public Notice in Official Gazette: 1990-07-17 Inves
26、tigated by: Japanese Industrial Standards Committee Divisional Council on Basic Items t This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan O JSA, 1991 Printed i n Tokyo by Hohbunsha Co., Ud. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/10/2007 22:02:15 MSTNo reproduction or networking permitted without license from IHS -,-,-