钍试剂分光光度法测定固定源烟气中SO3  

Thorin colorimetric method for sulfur trioxide determination from stationary sources

作　　者：李婕[1] 贾斌[2,3] 羌宁[1] 

机构地区：[1]同济大学环境科学与工程学院,上海200092 [2]太原市环境监测中心站,山西太原030002 [3]太原理工大学环境科学与工程学院,山西太原030024

出　　处：《环境污染与防治》2008年第10期63-66,70,共5页Environmental Pollution & Control

摘　　要：以80%(体积分数)异丙醇为吸收液采集SO3后,用过量的Ba(ClO4)2与吸收液中SO42-反应,剩余Ba2+与钍试剂生成钍-钡络合物,测定该络合物在530nm处的吸光度,由此间接计算出固定源烟气中SO3的浓度。钍试剂分光光度法对溶液SO42-测定范围为2.00～60.00μg/mL,检出限为1.17μg/mL。不同浓度样品的重复性实验和回收率检验结果证明了该法具有很好的精确度和准确度。样品中含有少量的Ca2+、Na+、K+、CO23-、Cl-等,对测定结果无显著影响。SO3 from stationary sources were absorbed by 80% isopropanol（v/v）. Superfluous Ba（ClO4 ）2 precipitated SO4^2- and the excess Ba^2＋ reacted with coloring agent thorin. A straight line calibration curve was established for SO4^2- within the range of 2.00-60.00 μg/mL at 530 nm; the detection limit was 1.17 μg/mL. The method had a high reproducibility and precision. Interferences due to the presences of calcium, sodium, potassium, nitrate, carbonate, phosphate, bromide, chloride, and fluoride species were within acceptable limits.

关 键 词：分光光度法 固定源 SO3 硫酸雾 钍试剂 

分 类 号：X831[环境科学与工程—环境工程]