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1、STD-IS0 b479-ENGL II984 4853903 0831891 847 INTERNATIONAL STANDARD IS0 6479:1984 TECHNICAL CORRIGENDUM 1 Published 1999-1 2-1 5 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MWYHAPOHAR oprmmuwi no C T w r n w H n OffiANismoN INTERNATIONALE DE NORMALISATION Shelled sweet kernels of apricots - Specif
2、ication TECHNICAL CORRIGENDUM 1 Amandes douces dabricots dcortiques - Spcifications RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to International Standard IS0 6479:1984 was prepared by Technical Committee ISO/TC 34, Agricultural fooproducts, Subcommittee SC 13, Dry and dried fruits and vegetable
3、s. Page I, table 1 In the seventh column of table 1 “Bitter kernels“, replace “% max.“ by “% ( m h ) max.“. Page 4, annex B In clause B.l and subclause 8.2.1, replace “at a pressure of 100 mmHg“ with “at a pressure not exceeding 100 mmHg“. This material is reproduced from IS0 documents tinder Intern
4、ational Organization f Standardization (KO) Copyright License Number HISICCI1 996. Not for resale. No part oftliese IS0 documents may be reproduced in any form, electronic retrieval system or otherwise, except as allowed in the copyright law of the country of use, or with tlic prior written consent
5、of IS0 (Case postale 56,121 I Geneva 20, Switzerland, Fax +41 22 734 IO 79), IHS or the IS0 Licensors members. ICs 67.080.1 O Q IS0 1999 -All rights reserved Printed in Switzerland Ref. No. IS0 6479:1984/Cor.l:1999(E) Copyright International Organization for Standardization Provided by IHS under lic
6、ense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:41:39 MDTNo reproduction or networking permitted without license from IHS -,-,- Shelled sweet kernels of apricots - Specification Amandes douces dabricots dcoriques - Spcifications First edition - 1984-06-15 3
7、21 1.5 4 2 6 7 79 Sulfur dioxide content mglkg max. 2000 2000 2000 1) Shrinkage is a sign of immaturity. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:41:39 MDTNo reproduc
8、tion or networking permitted without license from IHS -,-,- 4.1 Freedom from moulds, insects, etc. Shelled sweet kernels of apricots shall be free from moulds, living insects and mites visible to the naked eye (corrected if necessary, for abnormal vision) or with such magnification as may be necessa
9、ry in any particular case. If the magnification exceeds X 10, this fact shall be stated in the test report. 4.2 Extraneous matter The proportion of extraneous matter, such as dirt, stone, hard shells, dead insects and any other foreign matter in shelled sweet kernels of apricots, shall not exceed th
10、e value given in the table for the relevant grade. 4.3 Pest-infested, shrivelled and immature, spoiled kernels and broken pieces The proportion of pest-infested, shrivelled and immature, spoiled kernels and broken pieces shall not exceed the values given in the table for the relevant grade. 4.4 Bitt
11、er kernels The proportion of bitter kernels shall not exceed the value given in the table for the relevant grade. 4.5 Moisture content The moisture content of shelled sweet kernels of apricots shall not exceed 5 % (rnlrn) for each grade. 5 Sampling Methods of sampling dry and dried fruit and vegetab
12、le products wilt form the subject of a future International Standard. 6 Methods of test I 4851703 O048205 7 r Samples of shelled sweet kernels of apricots shall be tested for conformity of the product to the requirements of this International Standard by the methods of test specified in annexes A, B
13、 and C. 7 Packing and marking 7.1 Packing Shelled sweet kernels of apricots shall be packed in clean and sound containers made of a material which does not affect the product. If wooden boxes are used, the insides shall be covered with a suitable paper. If packed for direct consumption, small consum
14、er packages shall be used. The quantities packed in such packages may be 0,5 - 1,0 or 2,5 kg net mass, and, if required, more or less. A suitable number of such packages shall be placed in large wooden or cardboard cases. The size of the cases and the number of small packages packed in each case sha
15、ll be agreed between the purchaser and the supplier, but the mass of the cases shall not exceed 25 kg. 7.2 Marking The following particulars shall be marked or labelled on each container and case : a) name of the material, and trademark or brand name, if any; b) c) batch or code number; name and add
16、ress of the manufacturer or packer; d) net mass; e) grade of the material (see clause 3); f) producing country; g) any other marking required by the purchaser. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/997254
17、5001 Not for Resale, 04/25/2007 00:41:39 MDTNo reproduction or networking permitted without license from IHS -,-,- 6477-84 1 4853703 0048206 7 r IS0 6479-1984 (E) Annex A Determination of contents of spoiled and pest-infested and shrivelled and immature kernels, and extraneous matter content A.l Pro
18、cedure A.2 Expression of results Weigh, to the nearest 0,02 g, a test portion of about 500 g. Examine the test portion visually and carefully separate the spoiled and pest-infested, and shrivelled and immature, kernels, and extraneous matter, by hand or using tweezers. Weigh each of the categories s
19、eparately, to the nearest 0,02 g. The respective content of each category, expressed as a percentage by mass, is equal to ml - x 100 m0 where mo is the mass, in grams, of the test portion; ml is the mass, in grams, of the category concerned. 3 Copyright International Organization for Standardization
20、 Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:41:39 MDTNo reproduction or networking permitted without license from IHS -,-,- - b473-84 IS0 6479-1984 (E) Annex B Determination of moisture content B.l Principle Heating and drying
21、a test portion at 70 f 1 O C at a pressure of 100 mmHg1). Weighing, and determination of the loss in mass. B.2 Apparatus and material Usual laboratory equipment, and in particular B.2.1 Electrically heated constant-temperature oven, capable of being maintained at 70 f 1 O C at a pressure of 100 mmHg
22、. 8.2.2 metal, and of diameter about 85 mm. Dish, with a tight-fitting lid, of corrosion-resistant 6.2.3 sorb moisture. Fruit chopper, made of a material which does not ab- B.2.4 Desiccator, containing an efficient desiccant. B.2.5 Steam-bath. B.2.6 Analytical balance. B.2.7 Asbestos, finely divided
23、. WARNING - Attention is drawn to the dangers involved in the use of asbestos. B.3 Procedure B.3.1 Preparation of the test sample Take approximately 50 g of sample and pass it through the fruit chopper (B.2.3) three times, each time mixing thoroughly after- wards. B.3.2 Test portion Weigh, to the ne
24、arest 0,02 g, about 5 g of the prepared sample. I4853303 0048207 O I- few millilitres of hot water, then mix the test portion and asbestos together using a spatula. Wash the spatula with hot water, to return any particles adhering to it to the dish. Heat the uncovered dish on the steam-bath (8.2.5)
25、to evaporate the water. When the water has been completely evaporated, put the dish, with its lid alongside, in the oven B.2.1), maintained at 70 f 1 OC, and continue drying for 6 h under a pressure not exceeding 100 mmHg. Take care not to open the oven during this period. NOTE - The dish should be
26、placed in direct contact with the metal shelf of the oven. During drying, admit to the oven a slow current of air, which has been dried by passing it through sulfuric acid at a rate of about 2 bubbles per second. After the drying period, remove the dish from the oven, cover it immediately with its l
27、id and place it in the desiccator (8.2.4). Allow to cool to ambient temperature and weigh it to the nearest 0,02 g. B.3.4 Number of determinations Carry out two determinations on test portions taken from the same test sample. B.4 Expression of results The moisture content of the sample, expressed as
28、 a percentage by mass, is equal to ml -m2) ml -mo) x 100 where mo is the mass, in grams, of the dish, asbestos and lid; ml is the mass, in grams, of the dish, asbestos, lid and test portion before drying; m2 is the mass, in grams, of the dish, asbestos, lid and test portion after drying. Take as the
29、 result the arithmetic mean of the values obtained in the two determinations (B.3.41, provided that the requirement for repeatability (see B.5) is satisfied. Report the result to one decimal place. 6.3.3 Determination B.5 Repeatability Place about 2 g of the finely divided asbestos (8.2.7) into the
30、dish (8.2.2). which has been previously dried with its lid. Weigh the dish, asbestos and lid. Add the test portion, spreading it as evenly as possible over the asbestos in the bottom of the dish. Moisten the test portion and the asbestos thoroughly with a The difference between the values obtained i
31、n the two deter- minations (B.3.41, carried out simultaneously or in rapid suc- cession by the same analyst using the same apparatus in the same laboratory, shall not exceed 0,3 % (m/m). 1) 1 mmHg = 133,322 Pa 4 Copyright International Organization for Standardization Provided by IHS under license w
32、ith ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:41:39 MDTNo reproduction or networking permitted without license from IHS -,-,- 6479-84 48.53903 0048208 2 r IS0 6479-1984 (E) B.6 Test report The test report shall show the method used and the result ob- tained. It
33、 shall also mention any operating conditions not specified in this International Standard, or regarded as op- tional, as well as any circumstances that may have influenced the result. The test report shall include all the information necessary for the complete identification of the sample. 5 Copyrig
34、ht International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:41:39 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6479-1984 (E) Annex C absorption spectrometric met
35、hod) Determination of sulfur dioxide content Molecular C.l Principle Mixing a test portion with water and addition of sodium hydroxide solution. Addition of sulfuric acid solution and sodium chloride/mercury(ll) chloride mixed solution, then transfer of an aliquot portion to a test tube containing p
36、-rosaniline hydrochloride. Spectrometric measurement of the absorbance of the solution obtained at a wavelength of 550 nm. C.2 Reagents All reagents shall be of recognized analytical grade. The water used shall be distilled water or water of at least equivalent purity. C.2.1 Formaldehyde, 0,015 % so
37、lution, prepared by diluting 40 % formaldehyde solution in two steps, .e. 1 + 100 and 75 + 2 OOO. C.2.2 p-rosaniline hydrochloride, 0.1 g/l solution. Weigh 100 mg of acid-bleached p-rosaniline into a 1 O00 ml one-mark volumetric flask containing 200 ml of water. Add 160 ml of hydrochloric acid dilut
38、ed 1 + 1 and dilute to the mark. Allow to stand for 12 h before use. C.2.3 Sodium chloride/mercury(ll) chloride, mixed solution. Place 23.4 g of sodium chloride and 54,3 g of mercury(I1) chloride in a 2 o00 ml one-mark volumetric flask. Dissolve in about 1 900 ml of water and dilute to the mark. WAR
39、NING - Mercury salts are toxic. Use skin and respiratory protection when handling solid mercury salts and skin protection when handling concentrated aqueous solutions. C.2.4 responding to 0,l g of SO2 per litre. Sodium hydrogen sulfite, standard solution cor- In a 1 000 mi one-mark volumetric flask,
40、 dissolve about 170 mg of sodium hydrogen sulfite in water and dilute to the mark. Standardize the solution using 0,Ol mol/l standard volumetric iodine solution before use. 1 ml of this standard solution contains approximately 100 pg of so2. C.2.5 Sulfuric acid, 0,25 mol/l solution. (2.2.6 Sodium hy
41、droxide, 0,5 mol/l solution. C.3 Apparatus Usual laboratory equipment, and in particular C.3.1 wavelength of 550 nm. Spectrometer, capable of measuring absorbance at a C.3.2 sorb moisture. Fruit chopper, made of a material which does not ab- C.3.3 One-mark volumetric flasks, of capacity 100 rnl. C.3
42、.4 Blender, having a capacity of at least 300 ml. C.3.5 Pipette, free-running, of capacity 10 mi. C.4 Procedure C.4.1 Preparation of the test sample Take approximately 50 g of sample and pass it through the fruit chopper (C.3.2) three times, each time mixing thoroughly after- wards. C.4.2 Test porti
43、on Weigh, to the nearest 0,02 g, about 10 g of the prepared test sample. C.4.3 Determination Transfer the test portion to the blender (C.3.4) with 290 ml of water. Cover and blend for 2 min. Take a 10 ml aliquot portion from the bottom of the blender, using the pipette (2.3.51, and transfer to a 100
44、 ml one-mark volumetric flask C.3.3) contain- ing 4 ml of the sodium hydroxide solution (C.2.6). Swirl and mix for about 13 to 30 s. Add 4 ml of the sulfuric acid solution (C.2.5) and 20 ml of the sodium chloride/mercury(ll) chloride solution (C.2.3) and dilute to the mark. Transfer 2 ml of this sol
45、ution to a 200 ml test tube containing 5 rnl of the p-rosaniline hydrochloride (C.2.2). Add 10 ml of the for- maldehyde solution (C.2.1), mix and maintain at 22 O C for 30 min. Measure the absorbance at a wavelength of 550 nm, using as the reference liquid the blank test solution (see C.4.4). NOTE -
46、 If the same cell is used for successive determinations, clean it between measurements with hydrochloric acid diluted 1 + 1 and water. C.4.4 Blank test Carry out a blank test in parallel with the determination, using the same procedure and the same quantities of reagents as used for the determinatio
47、n, but omitting the 10 ml aliquot por- tion taken from the blender. 6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 00:41:39 MDTNo reproduction or networking permitted without
48、license from IHS -,-,- C.4.5 Preparation of the calibration graph Place 5 ml of the sodium chloride/mercury(ll) chloride solution (C.2.3) into each of a series of 100 ml one-mark volumetric flasks (C.3.3). Then add O; l,O; 2,O; 3,O etc. mi of the standard sodium hydrogen sulfite solution (C.2.41, ac
49、cording to the ex- pected sulfur dioxide content of the sample. Dilute to the mark and mix. Transfer 5,O rnl portions of each of these standard matching solutions to 200 ml test tubes containing 5 ml of the p-rosaniline hydrochloride solution (C.2.2). Add 10 ml of the formaldehyde solution (C.Z.I), mix and m