《ISO-4119-1995.pdf》由会员分享，可在线阅读，更多相关《ISO-4119-1995.pdf（8页珍藏版）》请在三一文库上搜索。
1、INTERNATIONAL STANDARD ISO 4119 Second edition 1995-06-01 Pulps - Determination of stock concentration P the Paper shall be such that all visible fibre and inorganic material will be retained. 3.4 Means for drying the Sample, for example suitable drying oven or hotplate. The temperature of the dryin
2、g oven shall be 105 “C + 2 “C and that of the hotplate 150 “C + 15 “C. NOTES 2 A microwave oven may optionally be used if the operating conditions (power setting and drying time) are experimentally determined to produce the Same drying effect on pulp as produced by a normal drying oven. Incorrect op
3、erating conditions may Cause charring of the Sample. 3 A temperature of 150 “C for the hotplate may be too high for some pulps and Cause charring of the Sample. 3.5 Balance, capable of weighing the dried mat of fibres with an error of less than 0,l %. 4 Sampling and Sample preparation 4.1 General Mi
4、x the stock thoroughly, and stir it while the Sample is being taken. Samples shall be removed with a suitable vessel by a scooping action, to minimize the Separation of fibres from the water. The entire Sample may be obtained in one dipping action, or several smaller samples may be combined, but all
5、 of the stock removed shall be included in the Sample to be weighed. Incorrect sampling techniques tan introduce significant errors at higher concentrations. Take samples for two determinations, or as many as are indicated in the test method for which the determination of stock concentration is bein
6、g made, Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:54:28 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 4119:1995(E) 0 ISO 4.2 Stock concen
7、trations less than 0,3 % (m/m) Take a Sample of at least 500 g (500 ml), and sufficient to ensure a mass of oven-dry fibre of between 1 g and 5 g. Weigh the Sample in a tared container (3.1) and determine the net mass (HZ,) with an error of less than 0,5 g, using the balance (3.2). 4.3 Stock concent
8、ration between 0,3 % (dm) and 1 % (dm) Take a Sample of approximately 500 g, pour it into a tared Container (3.1) and determine the net mass (LU,) with an error of less than 0,5 g, using the balance (3.2). 4.4 Stock concentration more than 1 % (d-m) Take a Sample of approximately 500 g, pour it into
9、 a tared Container (3.1) and determine the net mass (m,) with an error of less than 0,5 g, using the balance (3.2). Dilute with water, the mass of which (Q) is known with an error of less than 0,5 %, to give a stock concentration of less than 1 %. Mix thoroughly, take an aliquot of about 500 g, pour
10、 into a tared Container (3.1 j and determine the mass (Q) of the aliquot. 5 Procedure Dry a filter Paper (3.3) in a drying oven or on a hotplate (3.4) at the appropriate temperature to constant mass. Weigh it immediately and record the mass (Q). Carry out all weighings to the nearest 0,Ol g. The fil
11、ter Paper is considered as having reached constant mass when two consecutive weighings do not differ by more than 0,Ol g. In all cases the drying period between two consecutive weighings shall be no langer than necessary, but at least one-fourth of the total drying time previously applied. NOTE 4 We
12、ighing o? the dried filter Paper tan also be carried out after cooling in a tared Container (3.1). Place the filter Paper in the Bchner funnel (see 3.3), and wet it. Apply suction and filter the stock Sample (See clause 4) contained in the measuring cylinder or a tared Container (3-l), rinse the inn
13、er Walls of the cylinder or Container, and add the rinsings to the funnel. Make Sure that the filtrate is clear and, if not, filter again through the same filter, or run another test, with a denser filter Paper. Wash the mat of fibres with successive small quantities of distilled or deionized water.
14、 Remove the filter Paper and the mat of fibres carefully from the funnel, taking care that all the solid matter from the funnel Walls is included. Dry and weigh the mat oC fibres and the filter Paper as specified above, using the same procedure as when drying and weighing the filter Paper. Record th
15、e mass (m5). 6 Expression of results The stock concen tration X, expressed as a percentage by mass, is given by the formula X=m5-m4 XI00 ml where m1 is the mass, in grams, of the initial Sample ta ken; m4 is the dry mass, in grams, of the filter Paper; is the dry mass, and filter Paper. in grams, of
16、 the fibre mat If the Sample has been prepared according to 4.4, the stock concentration is given by the iormula where m1 is the mass, in grams, of the initial Sample ta ken; m2 is the amount of water added to dilute the initial Sample taken, in grams; is the mass of the aliquot taken, in grams; m4
17、is the dry mass, in grams, of the filter Paper; m5 is the dry mass, in grams, of the fibre mat and filter Paper. Report the result as the mean of the determinations to two decimal places. 7 Test repott The test report shall include the following information: aj reference to this International Standa
18、rd; b) all the information necessary for complete identification of the Sample; 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:54:28 MDTNo reproduction or networking permit
19、ted without license from IHS -,-,- 0 ISO ISO 4119:1995(E) Cl the stock concentration, percentage by masJ; expressed as a e) any operations not specified in this International Standard, which might have affected the results. d) any unusual features obkerved in he course o-0 the test; 3 Copyright Inte
20、rnational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:54:28 MDTNo reproduction or networking permitted without license from IHS -,-,- This page intentionally left blank Copyright International Or
21、ganization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:54:28 MDTNo reproduction or networking permitted without license from IHS -,-,- This page intentionally left blank Copyright International Organization f
22、or Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:54:28 MDTNo reproduction or networking permitted without license from IHS -,-,- SO 4119:1995(E) 0 ISO ICS 85.040 Descriptors: Paper Pulps, tests, determination of content, dry matter. Price based on 3 pages - Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 00:54:28 MDTNo reproduction or networking permitted without license from IHS -,-,-