【摘要】 目的探讨纺织品中痕量甲醛的褪色动力学分光光度测定法。方法利用甲醛在磷酸介质中对溴酸钾氧化溴酚蓝褪色反应的明显催化作用,用分光光度法测定纺织品中甲醛的含量,并研究了该褪色反应的最佳反应条件。结果磷酸、溴酸钾、溴酚蓝的最佳用量分别为2.0、3.0、1.0ml,反应温度85℃,反应时间10min。在波长430nm处,该方法检测甲醛的线性范围为0.05～0.40μg/ml,检出限为0.0069μg/ml,回收率为96%～102%,RSD为2.9%～3.2%。结论该方法测定纺织品中痕量甲醛简便、快速、灵敏,适于纺织品中痕量甲醛的测定。更多还原

【Abstract】 Objective To establish a discoloring kinetic analysis method for determination of trace formaldehyde in textiles. Methods Based on the catalysis of formaldehyde on the discoloring reaction of bromophenol blue oxidized by potassium bromated in phosphoric acid medium,the contents of formaldehyde in textiles were determinated by spectrophotometry. The optimum condition and kinetic parammeters of the reaction were studied in detail. Results The optimum required volumes of reagents were 2.0,3.0,1.0 ml for H3PO4,KBrO3 and bromophenol blue respectively.The reaction was optimized at 85 ℃ for10 min.At working wave length of 430 nm,the linear range was 0.05-0.40 μg/ml,the detection limit was 0.006 9 μg/ml ,the recovery rate and RSD were 96%-106% and 2.9%-3.2% respectively. Conclusion This method was easy ,rapid and sensitive for the determination of trace formaldehyde in textiles.更多还原