穿孔萃取–光度法测定大芯板中甲醛含量的研究

Study on Determination of Formaldehyde Content in Large Core Board Using Perforated Extraction Combined with Spectrophotometry

摘要: 本论文采用穿孔萃取法和乙酰丙酮分光光度法成功测定了大芯板中游离的甲醛的含量。甲醛与乙酰丙酮反应，产生稳定的黄色化合物3-亚甲基-2,4-戊二酮，再于波长412 nm处测定其吸光度。试验测得的板材中甲醛含量为0.0159 mg/m3。结果表明，利用穿孔萃取法和乙酰丙酮分光光度法测定大芯板中的甲醛含量时，甲醛含量在0~10 μg/ml范围内与吸光度呈现出良好的线性关系，其线性相关系数为r = 0.99872，加标回收率为97.6%~99.7%，平均加标回收率为99.0%，检出限为0.0890 μg/ml。由此可见，该法灵敏度较高，准确度较高，可适用于大芯板中甲醛含量的测定。

Abstract: In this paper, the content of free formaldehyde in large core board was successfully determined by perforated extraction and acetyl acetone spectrophotometry. In the environment of constant temperature shaking water bath and acetic acid-ammonium acetate buffer solution (pH = 6), formaldehyde reacts with acetyl acetone to produce a stable yellow compound 3-methylene-2, 4-pentanedione, which is then measured at a wavelength of 412 nm Its absorbance. The results show that when using perforated extraction and acetyl acetone spectrophotometry to determine the formaldehyde content in large core plates, the formaldehyde content has a good linear relationship with the absorbance in the range of 0~10 μg/ml, and its linear correlation coefficient (R)reaches 0.99872. The recovery rate of standard addition was 97.6%~99.7%, the average recovery rate of standard addition was 99.0%, and the detection limit was 0.0890 μg/ml. It can be seen that the method has high sensitivity and high accuracy, and can be applied to the determination of formaldehyde content in large core boards.