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Titolo:
REPORT ON COOPERATIVE DETERMINATION OF MO LECULAR-WEIGHT AVERAGES OF POLYMERS BY SIZE-EXCLUSION CHROMATOGRAPHY .4. A REPORT ON THE 2ND ROUND-ROBIN TEST (NO-2) - ON THE CONSTRUCTION OF BASE-LINE
Autore:
MORI S; TAKAYAMA S; GOTO Y; NAGATA M; KINUGAWA A; HOUSAKI T; YABE M; TAKADA K; SUGIMOTO T; SHIMIZU M; NAGASHIMA I; HASEGAWA A; SENBA T; OOSHIMA N; MAEKAWA T; SUGITANI H; OOZEKI H; NAKAHASHI K; HIBI K; OOTANI H; NAKAMURA S; SUGIURA K; UMEDA Y; OGIWARA S; KATSUNO Y; OOKUBO T;
Indirizzi:
JAPAN SOC ANALYT CHEM,RES COMM POLYMER ANAL,SECT SPECIAL STUDY SEC,SHIBUYA KU TOKYO 141 JAPAN
Titolo Testata:
Bunseki Kagaku
fascicolo: 9, volume: 45, anno: 1996,
pagine: 879 - 885
SICI:
0525-1931(1996)45:9<879:ROCDOM>2.0.ZU;2-M
Fonte:
ISI
Lingua:
JPN
Keywords:
SIZE EXCLUSION CHROMATOGRAPHY; NUMBER-AVERAGE MOLECULAR WEIGHT; ROUND ROBIN TEST; BASE-LINE CONSTRUCTION; RELATIVE STANDARD DEVIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
2
Recensione:
Indirizzi per estratti:
Citazione:
S. Mori et al., "REPORT ON COOPERATIVE DETERMINATION OF MO LECULAR-WEIGHT AVERAGES OF POLYMERS BY SIZE-EXCLUSION CHROMATOGRAPHY .4. A REPORT ON THE 2ND ROUND-ROBIN TEST (NO-2) - ON THE CONSTRUCTION OF BASE-LINE", Bunseki Kagaku, 45(9), 1996, pp. 879-885

Abstract

At 2nd round robin test (RR-2), the problem on the baseline construction was considered to be the main reason of high relative standard deviations (RSD) of number-average molecular weight (M(n)). There are twomethods to construct baseline of an SEC chromatogram. Method A is theextrapolation from the baseline at the beginning of the polymer chromatogram to the baseline after the solvent related peaks and method B is the draw of a linear baseline between the beginning of the polymer chromatogram and the end of the chromatogram before the solvent relatedpeaks (the lowest point between them). Laboratories at RR-2 were divided into two groups, group A which employed method A and group B whichemployed method B. After evaluating all data of M(n) and removing invalid data, RSDs of M(n) were calculated separately. RSDs in group A were between 5.2 and 7.1% and those in group B was between 7.3 and 9.3%. The average values of M(n) in group B were 1.13 to 1.23 times higher than those in group A. It is essential to standardize the procedure ofthe baseline construction in order to obtain better RSD. Ideally, method A is preferable, but there were several invalid data due to the disturbance of solvent related peaks and the low setup of cutoff molecular weight which he between 2500 and 3000. Method B is more appropriate, but tends to neglect low molecular weight components.

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Documento generato il 29/10/20 alle ore 20:51:52