| 摘要: |
| 我国的海藻资源异常丰富,种类多,分布广。海藻中含有多种营养物质,包括海藻多糖、多酚、活性碘、多种维生素、氨基酸等;同时也含有一定数量的重金属元素,其中砷元素与人类健康和生命活动有着至为密切的关系,是毒性金属研究的代表性物质。海藻中砷的含量、分布和形态直接关系到各种海藻的利用价值和方法。
我国国内对海藻中砷的研究较少,而国际上自本世纪初就开始了此项研究。1919年，Cornec 首次对海藻灰分进行定性的光谱分析,发现其中含有砷(Cornec,1919)。以后的大量文献对海藻中的砷及其测定方法进行了较为详细的研究报道,目前研究人员普遍认为，海藻中的砷以有机态和无机态并存,其中有机砷化合物占绝大多数,毒性较小(Whyte et al.,1983; Edmonds et al.,1993; Phillips et al.,1985)。目前国际上测定海藻中砷的方法主要有中子活化法(Lunde,1973)、原子吸收分光光度法(AAS)(Maher,1982,1983；Yasui et al.,1978)、感应耦合等离子体-原子发射分光光度法联用(ICP-AES)(Shinagawa et al.,1983)等,这些方法不仅需要大型仪器,而且样品的前处理过程比较复杂,操作亦难以掌握。
作者应用比较简便、灵敏的银盐分光光度法,使用国产仪器,以海带、鼠尾藻等样品进行实验研究,结果表明,本法非常适合于海藻中砷的测定,具有较高的实用价值。 |
| 关键词: 海藻、砷、银盐分光光度法 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第2945号 |
|
| STUDY ON CONTENTS OF ARSENIC IN SEAWEEDS I. SILVER SALT SPECTROSCOPY |
|
Sun Biao, Han Lijun, Lou Qingxiang
|
|
Institute of Oceanology,Chinese Academy of Sciences
|
| Abstract: |
| Silver salt spectroscopy of seaweeds samples collected from the Qingdao coast from March to August, 1996 showed that mature Laminaria japonica contains about 10.0 μg/g fresh weight of total arsenic; that arsenic content varies greatly within the same frond; that at the center tending to be higher than that at the marginal part. At the frond base, arsenic contents are about three times those at the top. This distribution characteristic relates to the plant metabolism. The more active metabolism some parts of seaweed have, the more arsenic they accumulate.Arsenic contents in Sargassum thunbergii from the Qingdao coast showed clear temporal variations, lowest at the initial stage, highest at maturity. The inorganic percentage in total arsenic showed similar variations. It proved that arsenic contents in seaweed were closely related to its growth cycle. Silver salt spectroscopy is a simple and accurate method of arsenic analysis. On account of its high sensitivity and recovery, it can be regarded as an effective method for determining arsenic in seaweeds. |
| Key words: ARSENIC,SEAWEEDS,SILVER SALT SPECTROSCOPY |
