海藻中有机碘的研究Ⅰ.海藻中有机碘含量测定

STUDIES ON ORGANIC IODINE FROM SEAWEED I. THE DETERMINATION OF THE CONTENTS OF ORGANIC IODINE IN SEAWEED

采用国际上目前通用的差减法来计算海藻中的有机碘,即首先测定海藻中的总碘和无机碘,其差减值为有机碘.碘的测定采用了碘离子选择电极法和中子活化法作为对照。在此基础上,还测定了新鲜海带中碘的含量、分布以及有机碘和无机碘的比例。研究结果表明,海带中碘的平均含量占鲜重的0.133％,其中88％的碘是以碘离子的形式存在,有机碘只占总碘的12％,同时海带不同部位碘的含量不同,叶部外缘含碘较多,是叶中部的2倍左右,尤其叶尖部的含量达到鲜重的0.183％。而有机碘的含量分布规律则不同,有机碘的含量在靠近根部的位置较高,为鲜重的13.9％。这种分布特点可能与海带的生命活动规律有关。

The iodine ion-elective electrode method and neutron activation analysis combined with chemical separation were used to determinate total iodine and inorganic iodine from seaweed Laminaria japonica , The subtraction method was used to calculate the organic iodine. The average contents of iodine in Laminaria japonica could constitute 0. 133% of fresh weight. The iodine contents vary greatly within the same sample. The front of Laminaria japonica was rich in iodine than the stipe, especially in the top of front, which the contents can reach 0.183 % . The root parts had the richer organic iodine( 13.9% in total iodine) than front parts. The total contents of inorganic iodine was 88%, the organic iodine was about 12%.