空气中碘的含量及形态分布测定——逐层滤膜捕集-高温热水解-催化分光光度法  

Determination of contents and modes of occurrence of iodine in air by sequential filters sampling followed by pyrohydrolysis for preparation and catalytic spectrophotometry for measurement

作　　者：陈韵伊 梁军[1] 李萍[1] 吴代赦[1] 

机构地区：[1]南昌大学环境与化学工程学院,江西南昌330031

出　　处：《南昌大学学报（工科版）》2013年第4期323-326,共4页Journal of Nanchang University(Engineering & Technology)

基　　金：国家自然科学基金资助项目(40973080)

摘　　要：设计、建立了测定空气中碘的含量与形态分布的采样装置与采样方法。设计制作了采样切割器,空气依次通过切割器中的玻璃纤维滤膜、浸渍NaOH溶液的玻璃纤维滤膜、浸渍四丁基氢氧化胺(TBAH)溶液的玻璃纤维滤膜、上覆活性炭的玻璃纤维滤膜,以分别捕集颗粒态碘、HI和I2、HOI、有机结合态碘。经优化选择,浸渍液NaOH的质量分数为10%、浸渍液TBAH的质量分数为20%、上覆活性炭的质量为0.4 g。采用高温热水解法处理捕集碘之后的滤膜,并用砷铈催化分光光度法分析热水解吸收液中的碘含量。由于采样切割器制作简单,仅使用常见、便宜的分析仪器,故该方法易于推广使用,适合空气中碘的含量与形态分布的日常监测。The method and equipment of sampling were studied to detect content and modes of occurrence of iodine in air. Cascade sampling cutter was designed, and air flowed from a glass fiber filter, through a NaOH impreg- nated glass fiber filter and a tetrabutylammonium hydroxide （TBAH） impregnated glass fiber filter, to a glass fiber filter loaded with activated charcoal, hence particulate iodine, HI and 12, HOI, and organoiodine were collected in the order. The concentration of NaOH and TBAH was optimized to be 10% and 20% ,respectively,and the mass of activated charcoal was optimized to be 0.4 g. The pyrohydrolysis was applied to sample digestion and further determination of iodine by As - Ce catalytic spectrophotometry. The method could be widely used for routine determination of iodine in air, because the cascade sampling cutter was simple and only common and no expensive instruments were required.

关 键 词：高温热水解 催化分光光度法 碘 空气 形态分布 

分 类 号：X851[环境科学与工程—环境工程]