ISO-4388-1991.pdf
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1、INTERNATIONAL STANDARD IS0 4388 Second edition 1991-12-15 Cigarettes - Determination of the smoke condensate retention index of a filter - Direct spectrometric method Cigarettes - D, SC rf; + If c is the mass of crude smoke condensate retained by the filter; 2 Normative references The following stan
2、dards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encourage
3、d to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 3308:1991, Routine analytical cigarette-smoking machine - Definitions and standard conditions. IS0 340
4、2:1991, Tobacco and tobacco products - At- mosphere for conditioning and testing. IS0 4387:1991, Cigarettes - Determination of total and nicotine-free dry particulate matter using a rou- tine analytical smoking machine. IS0 8243:1991, Cigarettes - Sampling. is the mass of crude smoke condensate ente
5、ring the filter; is the mass of crude smoke condensate in the main-stream smoke. SC ; Hc Figure 1 4 Principle Smoking of filter cigarettes in accordance with IS0 4387. Dissolution in methanol of the crude smoke condensate from the main-stream smoke. Removal of the filter material from the remaining
6、tobacco butts; dissolution in methanol of the crude smoke condensate retained by the filters. Determination of the absorbances at 450 nm of the two methanolic solutions by spectrometric meas- urement and calculation of the retention index from 1 Copyright International Organization for Standardizati
7、on Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 21:17:12 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 4388:1991(E) the ratio of the absorbances. The absorbances are directly proportional to the masse
8、s of crude smoke condensate (F, and H,). 5 Reagent 5.1 Methanol, having a water content lower than 0,05 % (m/m). 6 Apparatus Usual laboratory apparatus not otherwise specified and the following items. 6.1 Conditioning enclosure, regulated in accord- ance with the requirements of IS0 3402. 6.2 Routin
9、e analytical cigarette-smoking machine, complying with the requirements of IS0 3308 and IS0 4387. 6.3 Spectrometer, suitable for carrying out meas- urements at a wavelength of 450 nm. 6.4 Matched quartz cells, having an optical path length of 10 mm, if necessary, 5 mm and/or 20 mm. 6.5 Volumetric fl
10、asks, of capacities 100 ml or 125 ml, with ground glass stoppers. 6.6 One-mark pipettes, of capacities 5 ml and 10 ml. 6.7 Centrifuge, capable of producing a relative centrifugal acceleration of 25 gl). 7 Sampling Carry out sampling in accordance with the method specified in IS0 8243. 6 Procedure 8.
11、1 Conditioning of the test sample Keep the test sample in the conditioning enclosure (6.1) until it attains constant mass. 8.2 Test portion Take, as the test portion, 20 filter cigarettes from the conditioned test sample (8.1). 8.3 Determination 6.3.1 Smoking of the cig,arettes Using the routine ana
12、lytical cigarette-smoking ma- chine (6.2), smoke the 20 filter cigarettes constituting the test portion (8.2) in accordance with IS0 4387. NOTE 1 The number of cigarettes smoked per trap de- pends on the diameter of the glass-fibre filter and the yield of crude smoke condensate of the cigarette. For
13、 a 44 mm smoke trap this number is in general 5. For a 9 2 mm smoke trap this number is in general 20. Extinguish the butts by separating the burning zone, remove the filter plugs and free them from any ad- hering tipping and plug wrap material and from any tobacco. 8.3.2 Preparation of methanolic c
14、rude smoke condensate solution 8.3.2.1 Combine the cigarette filter plugs from one channel of the smoking machine and put them into 100 ml of methanol (5.1) in a volumetric flask (6.5). Do the same with the filter plugs from the other channels. Stopper the flasks, swirl the contents of each flask an
15、d allow them to stand in the dark for about 24 h. 8.3.2.2 Remove the glass-fibre filter discs from the smoke traps and prepare from each disc a solution of the crude condensate in 100 ml of methanol (5.1) in a volumetric flask (6.5). Stopper the flasks, swirl the contents of each flask and allow the
16、m to stand in the dark for the same time as the methanolic solutions obtained from the cigarette filter plugs (8.3.2.1). 8.3.2.3 Transfer, by means of a pipette (6.6), 5 ml to IO ml of each of the crude smoke condensate solutions, prepared as described in 8.3.2.1 and 8.3.2.2, to the centrifuge (6.7)
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