【摘要】 主要介绍大体积水样中¹²⁹I的测定方法及示范应用。100L以上的环境水样用强碱性阴离子交换树脂（201×7Cl^-型）搅拌吸附浓集,用活性氯浓度8.0％的NaClO解吸,CCl₄萃取,水反萃,AgNO₃沉淀制成AgI源,用加速器质谱计（AMS）测定¹²⁹I。方法回收率60％以上,最小可探测限为2×10^-10Bq/L,比目前通用的中子活化分析法高4～5个数量级。通过首次对全国有关地区环境水样中¹²⁹I的测定所获得的结果,充分表明该法简便、快速、灵敏度很高,适用于各种环境水样。更多还原

【Abstract】 A method for determination of 129I in 100 L environmental water and its application has been investigated. 129I in sample was absorbed on anion exchange resin (201X7C1-) by stirring. 129I absorbed on the resin was eluted by 8% NaClO with stirring, extracted with CC14 and backwashed with water. An AgI Source was prepared by precipitation and 129I was determined with a accelerator mass spectrometer (AMS). The Chemical recovery of this method is above 60%. The minimum detectable limit for 129I is 2X10-10 Bq/L. It is increased 104-105 times over activation analysis method- 129I in environmental water in some regions of China was determined for the first time by using this method, and the satisfactory results were got . It is indicated that this method is quite sensitive, simple and prompt. It can be used for many kinds of water samples.更多还原