All Title Author
Keywords Abstract

The Measurement of Iodine in Marine Sediments Using Spectrophotometric Method

DOI: 10.12677/AAC.2016.62006, PP. 35-42

Keywords: 碘,分光光度法,海洋沉积物岩芯
, Spectrophotometry, Marine Sediment Core

Full-Text   Cite this paper   Add to My Lib


本文建立了分光光度法测量海洋沉积物碘的方法。对采集自东太平洋、东海、胶州湾,和福建沿海沉积物岩芯的碘进行了研究。处理样品时,将沉积物样品与KOH混合灼烧,之后用水沥取样品中的碘,在酸性条件下,用饱和溴水将I?氧化成IO3?,加入淀粉和KI混合溶液显色剂,IO3?与显色剂中过量的I?反应生成I2,最后用紫外可见分光光度计进行测量。研究发现用KOH作为溶剂处理样品,沉积物与KOH的质量比以1:3至1:5为宜,灼烧温度和灼烧时间分别为500℃~800℃和1~4 h为佳。测量时最大光吸收波长为580 nm。对碘含量为2~100 mg/kg的沉积物样品,以2 g样品为例,沥取后定容100 cm3,加入6~12滴20 g/dm3淀粉和10 g/dm3 KI混合溶液显色剂较为合适;上机测量的样品溶液pH值在1.8~2.4之间较为适宜。最后我们对测定得海洋沉积物岩芯中的碘含量水平与文献结果进行了比较。
Spectrophotometric method of measuring iodine in marine sediment has been established in this paper. We have studied the iodine in marine sediment cores collected from East Pacific, East China Sea, Jiaozhou Bay, and coastal sea areas of Fujian. For marine sediment sample, iodine was leached with water from sample after it was treated by mixing it with KOH and combusted. Under the acid addition, the iodide in leachant was oxidized into iodate by adding saturated bromine solution. IO3? reacted with I? to form I2 after starch-KI mixing solution, as the color reagent, was added with excess I?. The measurement was performed by ultraviolet and visible spectrophotometer. It has been shown when igniting sample, the ratio range of 1:3 to 1:5 for sediment to KOH and keeping the combusting temperature at 500?C - 800?C for 1 - 4 h are suitable. The most absorbance of light is at wavelength of 580 nm. For the sediment sample of iodine content in the range of 2 - 100 mg/ kg, when the 2 g of sample was treated, 6 - 12 drops of mixing solution of the 20 g/dm3 starch and 10 g/dm3 KI, as the color reagent, would be added when leachant was made up to 100 cm3. The measurement would be conducted at pH of 1.8 - 2.4 for test solution. The comparison of iodine content levels in marine sediment we measured with data of literatures was done.


[1]  Preedy, V.R., Burrow, G.N. and Watson, R.R. (2009) Comprehensive Handbook of Iodine. Elsevier, Lon-don.
[2]  Wong, G.T.F. (1991) The Marine Geochemistry of Iodine. Critical Reviews in Aquatic Sciences, 4, 45-73.
[3]  Muramatsu, Y. and Wedepohl, K.H. (1998) The Distribution of Iodine in the Earth’s Crust. Chemical Ge-ology, 147, 201-216.
[4]  Alicke, B., Hebestreit, K., Platt, U., et al. (1999) Iodine Oxide in the Marine Boundary Layer. Nature, 397, 572-573.
[5]  Carpenter, L.J. (2003) Iodine in the Marine Boundary Layer. Chemical Re-views, 103, 4953-4962.
[6]  赵一阳, 鄢明才. 中国浅海沉积物地球化学[M]. 北京: 科学出版社, 1994: 174.
[7]  Li, H.B., Xu, X.R. and Chen, F. (2009) Determination of Iodine in Seawater: Methods and Applications. In: Preedy, V.R., Burrow, G.N. and Watson, R.R., Eds., Comprehensive Handbook of Iodine, Elsevier, London, 1-13.
[8]  刘崴, 杨红霞, 李冰. 碘分析方法研究进展[J]. 岩矿测试, 2008, 27(2): 127-136.
[9]  魏复盛, 王惠琪. 土壤元素的近代分析方法[M]. 北京: 中国环境科学出版社, 1992.
[10]  纪丽红. 海洋沉积物和铁锰结壳碘的地球化学与129I年代学[D]: [博士论文]. 厦门: 厦门大学, 2011.
[11]  王荣元. 大洋水和九龙江口沉积物中碘的地球化学[D]: [硕士论文]. 厦门: 厦门大学, 2014.
[12]  纪丽红, 刘广山, 李超, 陈志刚, 黄奕普. 福建省兴化湾、九龙江河口和东山湾潮间带沉积物岩心碘研究[J]. 海洋学报, 2013, 35(5): 177-183.
[13]  Ji, L.H., Li, G.S., Chen, Z.G. and Huang, Y.P. (2013) Iodine Study of Marine Sedi-ment from Three Sea Areas. Scientific Journal of Earth Science, 3, 41-48.
[14]  Muramatsu, Y., Takada, Y., Matsuzaki, H., et al. (2008) AMS Analysis of 129I in Japanese Soil Samples Collected from Background Areas Far from Nuclear Facilities. Quaternary Geochronology, 3, 291-297.
[15]  Aumann, D.C., Faleschini, H. and Friedmann, L. (1981) Determination of 129I and 127I at Natural Levels by Neutron Activation Analysis. Radiochima Acta, 29, 209-215.
[16]  詹晓青, 胡盼盼, 刘广山, 等. 南沙海域沉积物岩芯生物硅和碳酸盐研究[J]. 海洋科学前沿, 2015, 2(3): 53-63.
[17]  Whitehead, D.C. (1984) The Distribution and Transfor-mations of Iodine in the Environment. Environment International, 10, 321-339.
[18]  Fuge, R. and Johnson, C.C. (1986) The Geochemistry of Iodine—A Review. Environmental Geochemistry and Health, 8, 31-54.
[19]  Harvey, G.R. (1980) A Study of the Chemistry of Iodine and Bromine in Marine Sediments. Marine Chemistry, 8, 327-332.
[20]  Aldahan, A., Englund, E., Possnert, G., et al. (2007) Io-dine-129 Enrichment in Sediment of the Baltic Sea. Applied Geochemistry, 22, 637-647.
[21]  Oktay, S.D., Santschi, P.H., Moran, J.E., et al. (2000) The 129Iodine Bomb Pulse Recorded in Mississippi River Delta Sediments: Results from Isotopes of I, Pu, Cs, Pb, and C. Geochimica et Cosmochimica Acta, 64, 989-996.
[22]  高爱国, 刘焱光, 张道建, 等. 楚科奇海与白令海沉积物中碘的纬向分布[J]. 中国科学, 2003, 33(2): 155-162.
[23]  魏复盛, 陈静生, 吴燕玉. 中国土壤元素背景值[M]. 北京: 中国环境科学出版社, 1990.
[24]  刘广山. 海洋放射年代学[M]. 厦门: 厦门大学出版社, 2016.


comments powered by Disqus