【摘要】 本文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，活性氯浓度８．０％的ＮａＣｌＯ溶液解吸，ＣＣｌ４萃取，水反萃，ＡｇＮＯ３沉淀制成ＡｇＩ源，用串列加速器质谱计（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低４～５个数量级。通过首次对全国有关地区环境水样中１２９Ｉ的测定所获得的满意结果，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】 This paper describes a method for determining 129 I in large volume environmental water and its application. 129 I in a sample of volume greater than 100 L was absorbed on anion exchange resin(201×7 Cl -) and 129 I absorbed on the resin was eluted by 8% NaClO by stirring,extracted with CCl 4 and backwash extracted with water.A AgI source was prepared by precipitation and 129 I was determined with a accelerator mass spectrometry (AMS).The chemical recovery of this method is above 60%.The minimum detectable limit for 129 I is 2×10 -10 Bq/L.Its sensitivity is increased by 10 4～10 5 times over that of neutron activation analysis method. 129 I in environmental water in some regions of China was determined for the first time by us using this method,and the satisfactory results were got.It shows that this method is quite sensitive,simple and prompt.It can be used for various kind of water samples. (更多还原