Dai Jiu-Lan, Zhang Min, Zhu Yong-Guan
College of Environment and Resource, Shandong Agricultural University, Tai'an 271018, China.
Environ Int. 2004 Jun;30(4):525-30. doi: 10.1016/j.envint.2003.10.007.
In order to assess the adsorption of iodate by different soils from China, a series of batch experiments were conducted. It was found that soils rich in iron oxide had high affinity for iodate. Iodate adsorption isotherms could be well fitted with both Langmuir and Freundlich equations. Iodate adsorption by 20 different soils from China revealed that iodate adsorption was significantly correlated with soil organic matter negatively and positively with free iron oxide contents. At initial concentration of 4 mg I L(-1), iodate adsorption ranged between 9 and 34 mg kg(-1) soil. No correlation between iodate adsorption and cation exchange capacity and soil pH was found. For a single soil, there was a significant linear relationship between the amounts of iodate adsorbed and desorbed, but for a group of different soils, the relationship between the amounts of iodate adsorption and desorption followed a nonlinear relationship, the deviation mainly occurred at high adsorption side. The relationship between K(d) and free aluminum oxide and free iron oxide contents showed an exponential relationship for various soils with exception of the soil from Hetian in Xinjiang.
为了评估中国不同土壤对碘酸盐的吸附情况，进行了一系列批量实验。结果发现，富含氧化铁的土壤对碘酸盐具有较高的亲和力。碘酸盐吸附等温线能很好地拟合朗缪尔方程和弗伦德利希方程。对中国20种不同土壤的碘酸盐吸附研究表明，碘酸盐吸附与土壤有机质呈显著负相关，与游离氧化铁含量呈显著正相关。在初始浓度为4 mg I L(-1)时，碘酸盐吸附量在9至34 mg kg(-1)土壤之间。未发现碘酸盐吸附与阳离子交换容量和土壤pH值之间存在相关性。对于单一土壤，碘酸盐吸附量和解吸量之间存在显著的线性关系，但对于一组不同土壤，碘酸盐吸附量和解吸量之间的关系呈非线性关系，偏差主要出现在高吸附侧。除新疆和田土壤外，不同土壤的K(d)与游离氧化铝和游离氧化铁含量之间的关系呈指数关系。
