Speciation of iodine in soils

被引：46

作者：

Yamada, H ^{[1
]}

Kiriyama, T ^{[1
]}

Onagawa, Y ^{[1
]}

Hisamori, I ^{[1
]}

Miyazaki, C ^{[1
]}

Yonebayashi, K ^{[1
]}

机构：

[1] Kyoto Prefectural Univ, Fac Agr, Kyoto 6068522, Japan

来源：

SOIL SCIENCE AND PLANT NUTRITION | 1999年 / 45卷 / 03期

关键词：

iodate; iodide; organically bound iodine; soil iodine; tetramethylammonium hydroxide;

D O I：

10.1080/00380768.1999.10415819

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

In order to analyze the behavior and phytoxicity of iodine in soil, the chemical forms of soil iodine must be identified. Therefore, a method for quantitative speciation of iodine in soil was proposed. Iodine extracted from soil samples with tetramethylammonium hydroxide (TMAH) was separated into humic and fulvic acid fractions at pH 1.5 after the addition of ascorbic acid into the TMAH extract to reduce iodate into iodide. Since the iodide in the TMAH extract was recovered in the fulvic acid fraction by this procedure, iodine contained in the humic acid fraction,was considered to be organically bound. Iodine in the fulvic acid fraction was separated into organic iodine bound to fulvic acids and the total inorganic iodine. Furthermore, iodine soluble from soil in 0.1 mol L-1 potassium chloride was assumed to correspond to the amount of total iodide in soil, and from the difference in the concentration of total inorganic iodine and soluble iodide, the amount of iodate was calculated. By the application of this method, iodine in soil was separated into four fractions: organic iodine bound to humic acids, organic iodine bound to fulvic acids, iodate, and iodide. This speciation method was applied to two soils. It was found that a large proportion of iodine in soil occurred in an organically bound form.

引用

页码：563 / 568

页数：6

共 10 条

[1] SPECIATION OF SELENIUM IN SOIL [J].