气态污染物氯化氰的分光光度法测定

Determination of Cyanogen Chloride in the Air Pollution by Spectrophotometry

探索了氯化氰 (CNCl)气体在不同介质中的稳定性和可吸收性 ,及光度测定条件 ,方法用于三聚氯氰工厂烟道气、车间空气及厂区空气中CNCl含量的测定。

We report a spectrophotometic method for the determination of cyanogen chloride (CNCl) in air pollution, Experimental parameters for the stability and absorbility of CNCl gas in the different media were studied. The experimental conditions were optimized for CNCl as follows: absorbent: 1% isonicotinic acid-barbituric acid; reaction acidity: pH 5.8 in phosphate buffer at room temperature; masking agent: 0.01mol/L EDTA; lambda (max): 598 nm, The apparent molar absorptivity was found to be 1.17 x 10(5) L.mol(-1).cm(-1), the linear range was within 0 similar to 5 mug of CNCl in 25 mL solution; the regression equation of the curve has given by A = - 0.0040 + 1.935C(r = 0.9999). The method has been applied to the determination of CNCl in chimney gas,workshop air and production area air of the cyanuric trichloride plant, chemical works and pharmaceutical factory air. The relative standard deviation was below 2.7% (n = 4) for the cyanogen chloride amount within 13 similar to 64 mg/m(3), and when CNCl amounts were within 0.1 similar to 1.0mg/m(3), RSD was below 6.9% (n = 6). The recovery was 98.7%.