粘土矿物吸附/热裂解原子吸收法测定固体废弃物焚烧烟气中的汞
陈晖晖
福建省锅炉压力容器检验研究院,福州 350008
Determination of mercury in solid waste incineration flue gas by thermal cracking atomicabsorption with clay mineral adsorption
CHEN Huihui
Fujian Province Inspection and Research Institute for Boilers and Pressure Vessels,Fuzhou 350008,China
摘要:建立粘土矿物吸附/热裂解原子吸收法测定固体废弃物焚烧烟气中的汞。研究了7种粘土矿物的吸附性能,其中硅藻土对氧化态汞具有良好的吸附效果,用过二硫酸铵改性的硅藻土能用于吸附气态元素汞 ,用檬酸-柠檬酸钠缓冲液改性的硅藻土可作为二氧化硫吸附剂。优化硅藻土改性工艺,将其对固废焚烧烟气中不同形态汞进行吸附,通过高温热裂解原子吸收法直接进样测定。汞质量在0~50 ng内与吸光度线性良好,相关系数不小于 0.998。当采样量为30 L时 ,汞的检出限为0.0015 ?g/m3,定量限为0.0060 g/m3。 测定结果的相对标准偏差为0.50%~3.34%(n=7),样品加标回收率为98.5%~103.8%。改性吸附剂质优价廉,重复利用率高,方法准确、可靠,简便、快捷。
Abstract:A clay mineral adsorption/thermal cracking atomic absorption was established for the determination of mercury in solid waste incineration flue gas. The adsorption properties of seven clay minerals were studied. Among them, diatomite had a good adsorption effect on oxidized mercury. Diatomite modified with ammonium persulfate could be used to adsorb gaseous elemental mercury. Diatomite modified with citric acid sodium citrate buffer could be used as SO22 adsorbent. The diatomite modification process was optimized to adsorb different forms of mercury in solid waste incineration flue gas, and the samples were directly injected and determined by thermal cracking atomic absorption. The linearity of mercury content was good with absorbance in the range of 0-50 ng, the correlation coefficient is not less than 0.998. When the collection volume was 30 L, the detection limit of mercury was 0.001 5 μg/m3 and the limit of quantitation was 0.006 0 μg/m. The relative standard deviation was 0.50%-3.34% (n=7), and the recoveries rates were 98.5%-103.8%. 3 The modified adsorbent has the advantages of high quality, low price and high reuse rate, and the method is accurate, reliable, simple and fast.
关键词:粘土矿物;热裂解原子吸收法;固体废弃物;烟气;汞
Keywords:clay mineral; thermal cracking atomic absorption; solid waste; exhaust gas; mercury
基金:中央引导地方科技发展专项(2019L3020);福建省市场监督管理局科技项目(FJMS2020016)
本文引用格式:
陈晖晖.粘土矿物吸附/热裂解原子吸收法测定固体废弃物焚烧烟气中的汞[J].化学分析计量,2022,31(12):11.
CHEN Huihui. Determination of mercury in solid waste incineration flue gas by thermal cracking atomicabsorption with clay mineraladsorption[J]. Chemical Analysis and Meterage,2022,31(12):11.
相似文章: