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1 引言 工业废水中CN~-的测定,多采用硝酸银滴定法及异烟酸吡唑酮光度法。利用7-碘-8-羟基喹啉-5-磺酸钯的荧光法间接测定CN~-也有报道。本文利用7-碘-8-羟基喹啉-5-磺酸锌络合物,在pH=9.2的硼砂缓冲溶液中与CN~-作用置换出Zn~(2+)生成Zn(CN)_4~(2-),从而使络合物的荧光强度减弱,其减弱的荧光强度与CN~-浓度成正比。二元体系的线性范围为0.0～60μg/L10ml,在CTMAB存在的三元体系中,灵敏度明显提高。线性范围为0.0～6.0μg/10ml;回收率实验及应用于电镀厂废水中CN~-的测定,结果满意。 2 主要仪器和试剂 RF-540荧光分光光度计(日本岛津);CN-标准溶液,标定后分别稀释为10μg/ml和2μg/ml,0.020％7-碘-8-羟基喹啉-5-磺酸锌溶液,5.0×10~(-3)mol/L CTMAB水溶液;pH=9.2(0.05mol/L)硼砂缓冲液,实验用水为二次蒸馏水。
1 Introduction CN ~ - determination of industrial wastewater, the more use of silver nitrate titration and isonicotinol pyrazolone spectrophotometry. Indirect determination of CN ~ by fluorescence with palladium 7-iodo-8-hydroxyquinoline-5-sulfonate has also been reported. In this paper, Zn (CN) 4 ~ (superscript 2+) was substituted by Zn ~ (2+) with CN ~ - in a borax buffer solution with pH = (2-), so that the fluorescence intensity of the complex weakened, the weakened fluorescence intensity and CN ~ - concentration is proportional to. The linear range of the binary system is 0.0 ~ 60μg / L10ml, in the presence of CTMAB ternary system, the sensitivity was significantly improved. The linear range was 0.0-6.0μg / 10ml. The recovery was tested and the results were satisfactory for the determination of CN ~ - in electroplating wastewater. 2 main instruments and reagents RF-540 fluorescence spectrophotometer (Japan Shimadzu); CN-standard solution were diluted to 10μg / ml and 2μg / ml, 0.020% of 7-iodo-8-hydroxyquinoline- Zinc sulfonate solution, 5.0 × 10 -3 mol / L CTMAB solution; pH = 9.2 (0.05 mol / L) borax buffer, and the experimental water is double distilled water.