中国部分地区粮食和蔬菜的碘含量及其环境健康意义

The Iodine Contents in Chinese Grains and Vegetables and Its Environmental and Healthy Significance

采用高温热水解-砷铈催化分光光度法测定了我国部分地区粮食(大米、玉米及小麦)和蔬菜(辣椒及大豆)的含碘量。谷类主粮(大米、小麦、玉米)含碘均值为0.012,0.012,0.011μg/g,大豆和辣椒的含碘均值分别为0.023μg/g和0.035μg/g。地理分布对粮食和蔬菜的碘含量有一定的影响,玉米和辣椒碘含量沿海地区显著高于内地,但大米碘含量在沿海和内地的差异并不显著,而内陆大豆的碘含量甚至高于沿海地区的。蔬菜和谷物的碘含量较此前的报道值更低,其对我国居民摄入碘的贡献有待重新审视。谷壳中的碘含量大于稻米中的碘含量,这对富碘饲料的加工有一定的指导作用。

The iodine contents in grains and vegetables collected from some Chinese areas were determined by pyrohydrolysis-catalytic spectrophotometry method.The average iodine content in main grains（rice,wheat,corn）,soybean and chili was 0.012,0.012,0.011,0.023 and 0.035 μg/g,respectively.The geographic location has some influence on the iodine distribution in grains and vegetables.Iodine content in corn and chili from coastal areas were significantly higher than that from the inland areas.There was no significant difference in the iodine content between coastal and inland rice.However,the iodine content in soybean from coastal areas was lower than that from inland areas.The iodine content in Chinese grains and vegetables was lower than the previous reported values.The contribution of the iodine intake in plant foods for Chinese residents should be re-examined.The iodine content in chaff was higher than that in rice,which had steering effects for the iodine-rich feed processing.