ISO 5511-1992 Oilseeds determination of oil content method using continuous-wave low-resolution nuclear magnetic resonance spectrometry (rapid method)《油籽 含油量测定 .pdf

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1、- STD-IS0 5511-ENGL 1772 Li851703 0702220 131 INTERNATIONAL STANDARD IS0 551 1 :I992 TECHNICAL CORRIGENDUM 1 I. Published 1997-02-1 5 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEWYHAPOnHAR OPrAHH3AUHR fl0 CTAHpdTH3AUHH ORGANISATION INTERNATIONALE DE NORMALISATION Oilseeds - Determination of oil

2、 content - Method using cont i n uous-wave low-resol ut ion nuclear magnetic resonance spectrometry (Rapid method) TECHNICAL CORRIGENDUM 1 Graines olagineuses - Dtermination de la teneur en huile - Mthode par spectromtrie de rsonance magntique nuclaire nb is the mass, in grams, of the test portion b

3、efore drying 49.3); m, is the mass, in grams, ofcrude oil corre- sponding to the response Rx, read from the calibration line of the instrument (9.2); is the mean value of the responses of the instrument for the test portion, determined in 9.5; Rx is the response of the instrument corre- sponding to

4、the mass m, of crude oil, read from the calibration line of the instrument (9.2). n 10.2 Calculate the response factor of the residue using the formula Txm,xl00 % - Ex*m, w, = where wr nt,. is the response factor, expressed as a per- centage by mass, of the residue; is the mass, in grams, of the dri

5、ed oilseed residue from which the oil has been ex- tracted, used in 9.6; 3 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 5513 92 4853903 O508950 980 IS0 5511:1992(E

6、) 7 is the mean value of the responses of the instrument for the mass of dried oilseed residue from which the oil has been ex- tracted, determined in 9.6; m, and Ex have the same meanings as in 10.1 10.3 Calculate the oil content of the seeds using the formula (W, - W,)l - (W“/l(Wl Yo 1 - (Wr/lOO) W

7、= where W is the oil content of the seeds, ex- pressed as a percentage by mass; is the moisture content of the seeds, expressed as a percentage by mass, determined In accordance with IS0 665: WH w, and ur have the same meanings as in 10.1 and 10.2 respectively. Take as the result the arithmetic mean

8、 of the results of the two determinations (9.7), provided that their difference does not exceed 0,4 YO (m/m). If their dif- ference does exceed 0,4 YO (m/m), discard the re- sults of the two determinations and repeat the procedure (clause 9). Express the result to the nearest 0,l % (m/m). NOTE 7 For

9、 a given type of seed, the response of the residue is generally independent of the samples. For ex- ample, in the case of rapeseeds (see note 6 in 9.6), the oil content of the seeds is approximately equal to w = W, - 0.30 Ya (m/m) 11 Repeatability The difference between two single test results (see

10、3.2) obtained under repeatability conditions (see 3.3) shall not exceed 0,6 Yo (rnlm). Reject both results if their absolute difference ex- ceeds 0,6 Yo (m/m) and carry out two new single determinations (each time according to clauses 9 and IO). 12 Test report The test report shall specify the metho

11、d used, the results obtained, the name and type of NMR spec- trometer used and, if applicable, all adjustments made. It shall also mention all operating details not specified in this International Standard, or regarded as optional, together with details of any incidents which may have influenced the

12、 results. The test report shall include all information necess- ary for the complete identification of the sample. 4 Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Annex

13、 A (informa tive) Bibliography 11 IS0 542: 1990, Oilseeds - Sampling 2 IS0 5725:1986, Precision of test methods - Determination of repeatability and reproducibility for a stan- dard test method by inter-laboratory tests. Copyright International Organization for Standardization Provided by IHS under

14、license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IS0 5511:1992(E) UDC 633.85:543.422.25:547.915 Descriptors: agricultural products, oilseeds, chemical analysis, determination of content, oils, nuclear magnetic resonance method, spectrometric method. Price based on 5 Daaes Copyright International Organization for Standardization Provided by IHS under license with ISONot for ResaleNo reproduction or networking permitted without license from IHS-,-,-