氟化物熔盐体系中碘元素含量测定

使用NaClO氧化-电感耦合等离子体质谱(ICP-MS)分析技术测定了氟化物熔盐中碘元素含量,拟用于模拟熔盐反应堆环境中碘的行为研究。结果表明:含CsI的FLiNaK熔盐经NaClO氧化前处理,可使用ICP-MS有效测量其中的碘含量(以IO^-₃形式存在的碘),当FLiNaK盐取样量为0.1 g时,方法检出限为0.066μg/g,加标回收率为103.1%~104.3%,相对标准偏差(s r)<6%(n=6)。使用该方法与直接使用离子色谱法测量的结果一致,且该方法具有测量速度更快、检出限更低的优势,证实NaClO氧化-ICP-MS测量法可用于氟化物熔盐中低含量碘的有效测量。

Determination of Iodine Content in Fluoride Molten Salt

Iodine content in fluoride molten salt was determined by using NaClO oxidation-inductively coupled plasma mass spectrometry(ICP-MS)analysis technology,which is intended to be used to study the iodine behavior in simulated molten salt reactor environment.The results show that ICP-MS can measure the iodine content(in the form of IO^-₃)in FLiNaK salt correctly and reliably after oxidization by NaClO.When the mass of FLiNaK is 0.1 g,the detection limit of the methodology is 0.066μg/g,the recovery are from 103.1%to 104.3%,and the precisions are less than 6%(n=6).Furthermore,the measurement results obtained by ion chromatography(IC)and ICP-MS followed by NaClO oxidation are consistent,and the latter has the advantages of faster measurement speed and lower detection level.The method of NaClO oxidation-ICP-MS can effectively measure the low content of iodine in fluoride molten salt.