ISO-8022-1990.pdf
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1、INTERNATIONAL STANDARD IS0 8022 Second edition 1990-07-15 ANSI Ilafrna“ Dcx SexY Surface active agents - Determination of wetting power by immersion Agents de surface - D maintenance of complete submersion in the solution, by means of the specially designed gripper, of the cotton disc, which tends t
2、o float to the surface due to air trapped in the cloth. After displacement of air and penetration of the solution into the cloth, the cotton disc starts to sink. Determination of the wetting time by measuring the interval between the moment of immersion of the cotton disc and the moment when it begi
3、ns to sink. Determination of the wetting time using two standard sol- utions, at five concentrations for each, and then using the sur- face active agent solution under test, also at five different con- centrations. After plotting the three “wetting time/concentration” curves, determination of the we
4、tting power of the surface active agent under test by comparison of the position of its curve with the two standard curves. IS0 3819: 1985, Laboratory glassware - Beakers. 5 Reagents and products 3 Definition For the purposes of this International Standard, the following definition applies. 5.1 Dist
5、illed water, or water of equivalent purity, complying with the specifications of IS0 2456. Other grades of water may be used provided details are noted in the test report. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/99
6、60866100 Not for Resale, 04/24/2007 10:26:08 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8022 : 1990 (El 6.2 Sodium di-n-hexylsulfosuccinate, of recognized analytical grade. 6.4 Stopwatch, accurate to 0,l s. Dimensions in millimetres 5.3 Sodium di-n-heptylsulfosucci
7、nate, of recognized analytical grade. 6.4 Raw cotton control cloth, of known nature and characteristics, conditioned in the standard temperate at- mosphere specified in IS0 139, i.e. a relative humidity of 65 % and a temperature of 20 OC. (Various types of commercially available control cloths are d
8、escribed in annex A.) 6 Apparatus Ordinary laboratory apparatus and, in particular: 6.1 Beaker, low form, of capacity 1 000 ml, complying with the specifications of IS0 3819. 6.2 Cloth-immersion gripper, made of stainless-steel wire of about 2 mm diameter and whose dimensions are given in figure 1 (
9、see also the photo, figure 2, which shows an example of a gripper constructed in accordance with figure 1, with three support arms projecting at right angles from the gripper body). These arms may be mounted on a sliding collar as shown in figure 1. It is important that the design of the gripper is
10、such that, when a raw cotton disc held in the gripper is immersed in 700 ml of test solution in the 1 000 ml beaker (6.11, the cotton disc is held about 40 mm below the surface of the solution. It is also important that the gripper tips only open about 6 mm so that the cotton disc remains nearly ver
11、tical in the solution. o tl! 6 6.3 Punch, of diameter 30 mm, carefully degreased using a volatile solvent (for example dichloromethane). Figure 1 - Cloth-immmersion gripper 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9
12、960866100 Not for Resale, 04/24/2007 10:26:08 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8022 : 1990 (El Figure 2 - Photo showing example of gripper constructed in accordance with the requirements specified in 6.2 Figure 3 - Illustration of procedure 3 Copyright In
13、ternational Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:26:08 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8022 : 1990 (El 1 = 2 E C 2 E d E u O,l Sodium di-n-he lsulfosu
14、ccinate Wetting time (s) Figure 4 - “Wetting time/concentration” curves for surface active agents A, B and C, with standard curves for comparison 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 0
15、4/24/2007 10:26:08 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8022 : 1990 (El 7 Sampling The surface active agent laboratory sample shall be prepared and stored in accordance with IS0 607. 8 Procedure 8.1 Test portion Weigh, to the nearest 0,l g, 5 g of the laborat
16、ory sample into a 100 ml beaker. 8.2 Preparation of the surface active agent solution Dissolve the test portion (see 8.1) in water, if necessary after first making a paste of the surface active agent with water warmed to 40 “C, then diluting with water at about 20 “C. Transfer quantitatively to a 1
17、000 ml volumetric flask, make up to the mark with water and mix. Take 200 ml of the solution thus obtained, transfer to a 1 000 ml volumetric flask, make up to the mark with water and mix. If the Krafft temperature of the surface active agent is higher than 40 OC, make the paste and carry out the di
18、ssolution at a temperature at least equal to the Krafft temperature. Prepare the solution not less than 15 min, but not more than 2 h, before the measurement. Keep the solution at 20 - C + 2 OC until the beginning of the test. Conditions other than those given above (concerning the hard- ness or pH
19、of the water, temperature, possible assistants) may be chosen provided that they are noted in the test report. 8.3 Preparation of the discs of cotton control cloth Using the punch (6.31, cut out discs of 30 mm diameter from the raw cotton cloth (5.4). It is very important to avoid touching the cloth
20、 with the fingers as the presence of fatty materials or perspiration on the surface of the cloth may affect the results. 8.4 Cleaning the apparatus The success of the tests depends, to a certain extent, on the cleanness of the apparatus. Before the test, and if possible overnight, leave a chromic/ s
21、ulfuric acid mixtureI), prepared by gently stirring sulfuric acid fez0 I,84 g/ml) into an equal volume of a saturated solution of potassium dichromate, to stand in the beaker (6.1). Then rinse the beaker with water (5.1) until all traces of acid have disap- peared, finally rinsing with a small quant
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