Ru(bipy)_3^(2+)-CO_3^(2-)-SO_3^(2-)-KClO_3体系化学发光法测定空气中的二氧化硫

Chemiluminescence Determination of Sulfur Dioxide in Air Using Tris(2,2′-bipyridyl) Ruthenium(Ⅱ)-CO_3^(2-)-SO_3~(2-_-KClO_3 System

提出了 Ru(bipy) 2 +3 - CO2 -3 - SO2 -3 - KCl O3 体系化学发光法测定溶液中亚硫酸盐的方法。SO2 -3 浓度与化学发光强度在 1 .0× 1 0 - 7～ 1 .0× 1 0 - 4mol/L 范围内成正比 ,检出限为 8.76× 1 0 - 8mol/L,对 1 .0× 1 0 - 4mol/L SO2 - 3 溶液 6次测定的相对标准偏差为 2 .9%。该法用三乙醇胺作为吸收液 ,成功地用于测定空气中二氧化硫的含量 ,结果满意。

In the presence of tris(2,2′-bipyridyl)ruthenium(Ⅱ)(Ru(bipy) 2+ 3) and carbonate, the chemiluminescence produced by chlorate oxidizing sulfite in acidic solution was used to determine 1.0×10 -7～1.0×10 -4 mol/L of sulfite. The detection limit was 8.76×10 -8 mol/L and the relative standard deviation was 2.9% for 1.0×10 -4 mol/L sulfite solution (n=6). The method has been applied satisfactorily to the determination of sulfur dioxide in air by using triethanolamine (TEA) as absorbent material.