| 摘要: |
| 于1996年3-8月在广东、广西及青岛沿海采集了部分代表性马尾藻，采用银盐分光光度法对新鲜样品中砷的化学形态、季节变化进行了研究。结果表明，广东、广西沿海马尾藻的总砷和无机砷含量较高，其中羊栖菜的无机砷含量占其总砷的56.73％，说明马尾藻富集无机砷的能力较强。青岛沿海鼠尾藻和海黍子的总砷含量在生长初期最低，成熟期增至最高，无机砷占总砷的比例也表现出类似的季节变化，说明藻体砷含量与其生长周期有密切联系。 |
| 关键词: 马尾藻 砷 化学形态 季节变化 |
| DOI： |
| 分类号: |
| 基金项目:国家“九五”科技攻关项目，96-916-04-02号 |
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| CHEMICAL SPECIES AND SEASONAL VARIATIONS OF ARSENIC IN CHINESE SARGASSUM SAMPLES |
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SUN Biao,FAN Xiao,HAN Li-jun,LOU Qing-xiang
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Insititule of Oceanology, The Chinese Academy of deiences, Qingdao, 266071
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| Abstract: |
| Samples of Chinese Sargassum spp. were collected from the coast areas of Guangdong, Guangxi and Qingdao from Mar. to Aug. 1996. The samples were analyzed using silver salt spectroscopy, a simple, accurate method in arsenic analysis. The results show that Sargassum spp. from the Guangdong and Guangxi coast areas have high total and inorganic arsenic levels. Commonly, they contain more than 10.0×10-6 in fresh weight of total arsenic and above 20% of the percentage of inorganic arsenic in the total. Total arsenic contents of Sargassum hemiphyllum are the highest, reaching 57.6×10-6 in fresh weight. For Sargassum fusiforme, the percentage of inorganic arsenic in total arsenic reaches 56.73%. These observations suggest that the members of the Sargassaceae family can enrich the inorganic species of arsenic. Arsenic contents of Sargassum spp. from the Qingdao coast areas show clearly seasonal variations, with the lowest values at the young stage and the highest at maturity. The percentages of inorganic in total arsenic show similar curves of variations. Hence, arsenic contents in Sargassum spp. are closely related to their growth cycle.
In this paper, the contents, distribution patterns, seasonal variations and chemical species of arsenic, which is a representative toxic element, in Chinese Sargassum spp. are studied. According to researches undertaken elsewhere, most of arsenic in seaweeds exists in the form of organic arsenic species, except for Sargassum spp. This species contains more inorganic arsenic than the other seaweeds. The results of this paper show that the contents of arsenic in Chinese Sargasum spp. are similar to the results of the previous investigations. This research on seaweed toxic elements chemistry is undertaken for the ?rst time in China; it will play an important role in using the resources of Chinese Sargassum and developing the seaweed industry. |
| Key words: Sargassum spp., Arsenic, Chemical species, Seasonal variation |
