Abstract:

Objective: The aim of this study was to provide basic data reference for the selection of wood flooring and further guarantee the indoor air quality by verifying the formaldehyde release under the conditions that laminate flooring is completely paved in habitable room. Method: In this study, five batches of laminate flooring with formaldehyde emission less than 0.06 mg·m^-3(1 m³ chamber method)were selected as research objects, and according to five kinds of habitable room respectively, which formaldehyde concentration in the verification space was tested by phenol reagent spectrophotometry. Result: 1) Before paving the floor, the selected space in this study was verified the existence of a certain amount of formaldehyde (hereinafter referred to as C₀) in the air. In Ⅰ class buildings, C₀ of 1 h and 12 h in the range of 0.006-0.031 mg·m^-3 and 0.006-0.032 mg·m^-3, with a mean of 0.015 mg·m^-3 and 0.016 mg·m^-3, respectively. In class Ⅱ buildings, C₀ of 1 h and 12 h was in the range of 0.004-0.021 mg·m^-3 and 0.004-0.022 mg·m^-3, respectively, with a mean of both 0.015 mg·m^-3.2) After paving the floor, with airtight time increased in the door and window, formaldehyde concentration also increased in the air. When the airtight time increased from 1 h to 12 h, the average value of C in class Ⅰ buildings increased from 0.054 mg·m^-3 to 0.068 mg·m^-3, while In class Ⅱ buildings, the average value of C increased from 0.055 mg·m^-3 to 0.066 mg·m^-3.3) Five batches of laminate floorings were selected to be paved in five kinds of indoor spaces respectively, and formaldehyde concentration released from laminate floorings to the verification spaces at each sampling point(after deducting C₀) conformed to the national standard GB 50325—2010 and GB/T 18883—2002. Meanwhile, the formaldehyde concentration of each sampling point still conforms to the national standard. Conclusion: Accordingly, under the testing conditions, formaldehyde emission concentration of the house still meet the national building and air quality standards after paved laminate flooring completely. It is suggested to study the effects of different formaldehyde grades and flooring types on formaldehyde concentration in indoor air in the future, with aims to systematically and scientifically evaluate the relationships between the basic performances of wood flooring and formaldehyde concentration in indoor air.

Key words: formaldehyde release, laminate flooring, large space, 1 m³ chamber method, habitable room