分光光度法测定甲醛甲酚溶液中甲醛的含量

Measurement of Formaldehyde in Formaldehyde and Cresol Solution by Spectrophotometry

目的建立甲醛甲酚溶液中甲醛的含量测定方法。方法利用甲醛与乙酰丙酮及铵离子反应,生成黄紫色化合物,采用分光光度法进行测定。结果确定检测波长为413 nm,甲醛量在4.39～30.73μg范围内线性关系良好(R2=0.999 9),平均回收率99.4%,RSD=1.4%。结论该方法准确、精密、稳定,专属性强,具有较好的耐用性,能够很好测定甲醛甲酚溶液中甲醛的含量。

Objective To set up a method for detecting formaldehyde in formaldehyde and cresol solution. Methods Based on a yellow-purple complex with a specific absorption wavelength at 413 nm yielded by reacting with NH＋4 and acetylacetone,the formaldehyde in formaldehyde and cresol solution was measured by spectrophotometry. Results There was a good linearization between the absorbency from UV and formaldehyde within 4.39～30.73 μg,R2=0.999 9.The average recovery was 99.4% and RSD 1.4%. Conclusion The method is accurate,simple,rapid,specific and can be used to measure formaldehyde in formaldehyde and cresol solution.