Study on the Total Iodine and Iodine Speciation Characteristics in Xilingol League, Inner Mongolia and Tacheng, Xinjiang High Iodine Area by HPLC-ICP-MS
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摘要: 长期饮用高碘水将对人体造成危害，地下水总碘及碘形态分析对于高碘地区碘环境地球化学研究具有重要价值。本文采用高效液相色谱-电感耦合等离子体质谱联用技术对内蒙古锡盟与新疆塔城高碘地区地下水总碘及碘形态进行测定。研究表明：锡盟地区地下水中碘以I-形态为主，总碘量维持在200 μg/L，个别点位达到600 μg/L甚至1700 μg/L，呈环状分布，从东北至西南呈现“低-高-低”的分布规律；塔城地区地下水中的碘以IO3-形态为主，总碘量不足100 μg/L，个别点位接近200 μg/L，呈层状分布，自东向西逐渐升高。分析认为，氧化性的条件利于不同碘形态之间的转化；溶解氧过高或过低都不利于碘的储存；碘会随着可溶性盐的流失而流失；沿河流的流向，下游地势较低，总碘得到积累。本研究结果对于锡盟和塔城地区科学预防甲状腺肿、制定法律法规具有指导作用。
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关键词:
- 地下水 /
- 总碘 /
- 碘形态 /
- 高效液相色谱-电感耦合等离子体质谱
Abstract: Long-term drinking of high-content iodine water will cause harm to human health. The analysis of total iodine and iodine speciation in high iodine groundwater is of great value for iodine environmental geochemistry in high iodine regions. In this study, High Performance Liquid Chromatography-Inductively Coupled Plasma-Mass Spectrometry (HPLC-ICP-MS) was used to analyze the total iodine and iodine speciation of groundwater in Xilingol League, Inner Mongolia and Tacheng, Xinjiang high iodine area. Results show that I- is dominant in Xilingol League groundwater and the total iodine is maintained at 200 μg/L, with individual points reaching 600 μg/L or even 1700 μg/L. The content of iodine in Xilingol League groundwater is distributed in a circular pattern, showing a 'low-high-low' distribution pattern from northeast to southwest. IO3- is dominant in Tacheng groundwater, with the total iodine content of less than 100 μg/L and the individual points are close to 200 μg/L. Moreover, the total iodine content increases gradually from east to west, showing a layered distribution. Oxidation condition is beneficial to the transformation between different iodine speciations. It is not conducive to the iodine enrichment when dissolved oxygen is too high or too low. Iodine will decrease with soluble salt loss. The downstream total iodine content is higher than the upstream content along the flow direction. This study is of significance to the scientific prevention of goiter and the establishment of laws and regulations in Xilingol League and Tacheng. -
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