1,2-萘醌-4-磺酸钠体系分光光度法测定对苯二酚

建立了用1,2-萘醌-4-磺酸钠分光光度法测定对苯二酚的新方法。研究表明,在pH=13.00的KCl-NaOH缓冲溶液中,对苯二酚能够催化溶液中的OH^-离子与1,2-萘醌-4-磺酸钠反应形成橙红色的2-羟基-1,4-萘醌,其最大吸收波长为454 nm。对苯二酚质量浓度在1.3×10^-7～1.32×10^-5g/mL范围内与吸光度呈现良好的线性关系。线性回归方程为A=0.025 61＋0.073 28c（1×10^5mol/L）,线性相关系数r=0.995 5,检测限为9×10^-8g/mL。方法能直接用于水样中对苯二酚含量的测定,回收率在96.5%～103%。

焦化含酚废水深度处理过程中间产物对苯二酚的测定

Microdetermination of organic compounds concerned in destructive phenols in industrial waste water is studied in this paper Spectrophotometry was used for the analysis of hydroquinone The hydroquinone could react with sodium phosphotungstate to form a blue complex in the treatment process of waste water containing phenol by photoelectrocatalytic degradation method The affecting factors were discussed and the optimum parameters were obtained The absorbance of the colored product was measured at 745*#nm, 20*#℃～25*#℃ with pH value of 8～10 and the amount of indicator (sodium phosphotungstate) of 5*#ml for 5*#min The hydroquinone could be determined in the presence of other middle products, such as phenol, benzoquinone and maleic anhydride The recovery of hydroquinone was in range from 958% to 1013% and relative standard deviation was less than 39% It proves to be a practical way for easy analysis of hydroquinone in enviroment monitoring with the advantages of application of relatively simple apparatus, small amount of sample, and rapid and convenient

聚合物中痕量磷测定新方法的研究

以抗坏血酸、氯化亚锡、亚硫酸钠与对苯二酚 3组不同还原剂对磷标样进行了比较实验 ,发现亚硫酸钠与对苯二酚作为还原剂具有良好的选择性 ,据此建立了测定痕量磷的新方法。该法灵敏度高 ,聚合物中的常见离子不干扰痕量磷的测定。在硫酸介质中 ,蓝色配合物在 710nm处有最大吸收 ,磷含量在 0～ 5 0 μg范围内服从比耳定律 ,检测限可达 3.2 8× 10 -2 μg·mL-1。常温下 ,蓝色配合物至少可稳定 2 4h。