摘要
目的:通过核医学示踪剂氧-18水废液的提纯工艺的研究,选定适宜的氧-18水废液的提纯工艺。方法:建立小型的氧-18水废液的纯化处理装置,分别串接棉芯过滤、活性炭吸附、紫外氧化、反渗透、离子交换、简单蒸发等6种处理工艺。将实验物料10.5 kg均分为21份,每份500 g。利用计量泵分别单独通过上述处理工艺,物料循环5次,每种处理工艺3份,测定每一次循环处理得到的物料样品的电导率、总有机碳(TOC)含量、氧-18丰度等参数值以及物料损耗值,并进行统计学分析。结果:反渗透工艺的物料损耗较大,离子交换工艺的氧-18丰度下降较多,均不可选用。活性炭吸附、棉芯过滤等尽管其初期有较大的物料损耗,但后续处理中损耗较少,紫外氧化、简单蒸发基本上不存在物料的损耗。同时,这几种处理工艺对于氧-18核素丰度的影响也较小。适宜的氧-18水废液的纯化处理工艺为棉芯过滤、活性炭吸附、紫外氧化、简单蒸发过程。使用该优选工艺流程进行验证性实验,处理物料1500g,得到电导率(2.22±0.03)μS/cm、TOC(0.86±0.01)mg/L、氧-18丰度为(32.44±0.04)atom%的物料1341g,物料损耗率为10.6%,氧-18丰度下降2.56%。结论:氧-18水废液经棉芯过滤、活性炭吸附、紫外氧化、简单蒸发的处理过程,基本满足净化指标要求。
Objective： To study the recycling technique for used nuclear medicine tracer oxygen-18 water. Methods： A small-scale purification device for wasted oxygen-18 water was built. Six processes, including cotton core filtration, active carbon adsorption, ultraviolet oxidation, anti-osmosis filtration, ion exchange, and simple evaporation, were included in the device. Totally 10.5 kg experimental samples were evenly divided into 21 portions. Three portions of the samples were treated by each of the above 6 processes for 5 cycles by dosing pump. The electrical conductivity, TOC （total organic carbon）, enrichment of oxygen-18 water, and the material consumption, were statistically analyzed after each recycling. Results： Samples were greatly consumed in the anti osmosis filtration process and the enrichment of oxygenq8 in the ion exchange process dropped markedly; therefore, the above 2 processes were ruled out for the recycling. Though sample consumption was higher in the initial steps of cotton core filtration and active carbon adsorption, but was lower in the latter steps. Samples were hardly consumed in ultraviolet oxidation and simple evaporation; meanwhile, these processes had little influence on enrichment of isotope oxygen-18. The suitable processes for wasted oxygen-18 water purification were cotton core filtration, active carbon adsorption, ultraviolet oxidation, and simple evaporation. The 4 suitable steps were used for 1 500 g samples. The conductance value of the resultant samples （1 341 g） was （2.22±0. 03）μS/cm, the TOC was（0.86±0.01）mg/L, and the enrichment was （32.44 ± 0. 04）atom% （dropped by 2. 56%）, with the sample consumption rate being 10. 6%. Conelusion： Cotton core filtration, active carbon adsorption, ultraviolet oxidation, and simple evaporation can basically meet the demand for recycling oxygen-18 water.
出处
《第二军医大学学报》
CAS
CSCD
北大核心
2007年第5期545-548,共4页
Academic Journal of Second Military Medical University
基金
国家发改办高技[(2005)1899号].~~
关键词
氧-18水
分离和提纯
核医学
oxygen-18 water
isolation and purification
nuclear medicine
