THE EFFECTS OF DIFFERENT METHODS OF PREPARING CELLULOSE NITRATE ON THE DETERMINATION OF THE D-H RATIOS OF NON-EXCHANGEABLE HYDROGEN OF CELLULOSE
THE EFFECTS OF DIFFERENT METHODS OF PREPARING CELLULOSE NITRATE ON THE DETERMINATION OF THE D-H RATIOS OF NON-EXCHANGEABLE HYDROGEN OF CELLULOSE
复制标题
DOI：
10.1016/0012-821x(81)90001-7
复制
发表时间：
1981-01-01
影响因子：
5.3
通讯作者：
DENIRO, MJ
中科院分区：
文献类型：
--
作者：
DENIRO, MJ
对不同制备方法制备的硝酸纤维素进行了元素、同位素和光谱分析。木粉硝化制得的硝酸纤维素受到污染，很可能受到硝化木质素的污染。木质纤维素硝化制备的硝酸纤维素不含该组分，因此可以更准确地测量纤维素中非交换性氢的D/H比。然而，由纤维素直接制备的硝酸纤维素含有微量的半纤维素硝酸盐，并且没有完全硝化。这些条件不会导致对大多数样品测量的D/H比出现显著误差。用这两种方法硝化的相同样品的等分分析表明，在许多情况下，公布的木材中硝酸纤维素的δD值可能误差6-8‰，有时甚至高达15‰。
Cellulose nitrate prepared by different methods was subjected to elemental, isotopic, and spectroscopic analysis. Cellulose nitrate prepared by nitration of wood powder was contaminated, most likely by nitrated lignin. Cellulose nitrate prepared by nitration of wood cellulose did not contain this component, and thus provides a more accurate measure of the D/H ratios of non-exchangeable hydrogen of cellulose. However, cellulose nitrate prepared directly from cellulose contained trace amounts of hemicellulose nitrates and was not completely nitrated. These conditions will not cause significant errors in the D/H ratios measured for most samples. Analysis of aliquots of the same samples nitrated by the two methods suggests that published δD values of cellulose nitrate from wood may be in error by 6–8‰ in many cases and occasionally by as much as 15‰.