排序方式: 共有3条查询结果,搜索用时 0 毫秒
1
1.
Summary In order to determine the applicability of retention indices, based on the alkylarylketone scale, as the basis of a reproducible
method of reporting retentions, the separation of ten barbiturates and a set of column test compounds were examined on an
octadecylsilyl bonded silica (ODS-Hypersil) column with methanol-buffer pH 8.5 as eluent. The effects on the capacity factors
and retention indices, on changing the eluent composition, pH, ionic strength and temperature, showed that the retention indices
of the barbiturates were much less susceptible to minor changes in the eluent than the capacity factors. For non-ionised compounds
the retention indices were virtually independent of the experimental conditions.
Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984 相似文献
2.
Summary The capacity factors and retention indices, based on the alkylarylketone scale, of ten barbiturates and a set of five column
test compounds have been compared on a series of different octadecylsilyl bonded (ODS) silica columns under identical elution
conditions of 40:60 methanol-buffer pH 8.5 at 30 °C. The retentions were highly reproducible on columns prepared from the
same batch or different batches of ODS-Hypersil, but large differences in the capacity factors were found when column packings
from different manufacturers were compared. Retention indices were more reproducible than capacity factors but they could
not compensate for differences between the different packing materials.
Presented at the 15th International Symposium on Chromatography, Nürnberg, October 1984 相似文献
3.
Summary The application of alkylarylketones and n-alkanes as retention index scale standards in supercritical fluid chromatography has been examined using a packed polystyrene-divinylbenzene column. The two scales gave comparable results but the alkylarylketone scale gave comparable results but the alkylarylketone scale was considered to have a wider application as it could also be used when modifiers were added to the mobile phase. The changes in the retention indices of a number of aromatic test compounds were used to compare the selectivity of the separation under different temperature and pressure conditions and in the presence of modifiers. 相似文献
1