| 摘要 |
The present invention relates to a method for analyzing formaldehyde. More specifically, the invention relates to a method for analyzing formaldehyde in the ambient air which can collect formaldehyde gas in the ambient air and simply implement an analysis of concentration thereof. A method for analyzing formaldehyde in the ambient air according to the present invention comprises the steps of passing a given amount of air to be inspected through a collecting vessel filled with a given amount of 2N-KOH solution or 2N-KOH solution; filling a given amount of AHMT reagent in the collecting vessel and leaving the reagent for a given amount of time, setting a standard color solution to an absorptiometer for adjusting the indication value thereof to a predetermined value, adding a given amount of KIO4 reagent to the collecting vessel, and setting the collecting vessel to the absorptiometer to detect formaldehyde concentration from the indication value of the absorptiometer. The formaldehyde in the ambient air can be efficiently collected by 2N-KOH solution or 2N-NaOH solution. Furthermore, under a premise that a given amount of the air passes through the reaction vessel, by adjusting the indication value of the absorptiometer to the predetermined value by using a standard colored liquid, the indication value upon measurement of absorbance of an unknown sample can be directly read as the concentration of the formaldehyde. Accordingly, calculation using molecular weight of formaldehyde and volume conversion coefficients as gas and so forth become unnecessary, and expert knowledge and chemical calculation becomes unnecessary. In addition, transferring or division of the sampled solution becomes unnecessary, therefore requiring no skill in handling. <IMAGE> |
