Attempt to quantify organic and inorganic iodine isotopes in aquatic environment

Abstract

The purpose of this study is to quantitatively analyze iodine isotopes in environmental water samples using accelerator mass spectrometry (AMS) and inductively coupled plasma mass spectrometry (ICP-MS). As a result of the iodine recovery experiment by the Pyrohydrolysis method, there were large variations in the recovery rate of both inorganic and organic iodine, so it is difficult to apply this method to environmental water samples and evaluate total iodine. A simple and quantitative method for converting organic iodine in water samples to an inorganic state and recovering inorganic iodine needs to be further investigated and optimized by chemical reaction with reagents and decomposition of organic matter with ultraviolet rays. From the results of long-time measurements of I-127 and some elements by ICP-MS, In-115, which is commonly used as an internal standard, does not function as an internal standard for I-127, particularly in high matrix solutions, suggesting that Re-185 is relatively suitable as an internal standard for I-127.