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各种装修材料的相继使用,居室空气中甲醛等化学污染物浓度比装修前有显著增高,居室空气污染已成为不可忽视的公共卫生问题。我们特对空气中甲醛的采样和检测方法进行了探讨,并与CB/T5009.61-96方法中甲醛含量的测定方法进行了比较,发现酚试剂比色法在测定微量甲醛时优于国标法GB/T5009.61-96,现报告如下。材料与方法1．测定原理甲醛与酚试剂反应生成嗪,嗪在酸性溶液中被铁离子氧化形成蓝色化合物,其颜色的深浅与甲醛含量成正比,与标准比较定量。该方法最低检出浓度为0.026mg/m~3。
A variety of decoration materials used in succession, indoor air formaldehyde and other chemical pollutants concentrations significantly higher than before the decoration, indoor air pollution has become a public health problem can not be ignored. We are special on the formaldehyde in the air sampling and testing methods were discussed and CB / T5009.61-96 method for the determination of formaldehyde content were compared and found that the phenol reagent colorimetric method for the determination of trace formaldehyde is better than the national standard method GB / T5009.61-96, the report is as follows. Materials and methods 1. Determination of the principle of formaldehyde and phenol reagent reaction generated oxazine, oxazine in acidic solution is oxidized by iron ions to form a blue compound, the color depth and formaldehyde content is proportional to the standard comparison quantitative. The minimum detectable concentration of this method is 0.026mg / m ~ 3.