Iodine plays a key role in atmospheric chemistry that can significantly affect the atmospheric oxidation capacity. Although the oceans are the main reservoir of iodine on Earth, iodine is also widely present in the terrestrial environment. Therefore, a comprehensive understanding of the present sources of iodine in inland areas is warranted for the evaluation of its environmental effect. In this study, we conducted monitoring of total iodine in particulate matter (PM) in the Shihezi (SHZ) over 11 months using a high-pressure confined microwave digestion technique and an inductively coupled plasma mass spectrometer (ICP-MS). The mean concentrations of total iodine in PM and PM were 2.60±1.81 ng/m and 2.90±1.92 ng/m, respectively, at the same time, it shows the change characteristics of winter > spring > summer > autumn. Eight water-soluble ions were used as auxiliary parameters for multivariate statistics, including principal component analysis (PCA) and absolute principal component score-multivariate linear regression (APCS-MLR), to estimate the potential source assignments of PM iodine. PCA extracted four possible sources, respectively, and APCS-MLR indicated that anthropogenic activities, such as coal combustion and industrial emissions, were the primary potential sources of iodine, followed by certain unknown sources. This study indicated that anthropogenic activities were an important source of atmospheric iodine in the inland regions.
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Iodine plays a key role in atmospheric chemistry that can significantly affect the atmospheric oxidation capacity. Although the oceans are the main reservoir of iodine on Earth, iodine is also widely present in the terrestrial environment. Therefore, a comprehensive understanding of the present sources of iodine in inland areas is warranted for the evaluation of its environmental effect.
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