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The sampling and reaction/elution of formaldehyde using DNPH-tubes presented adequate linearity and an identical sensitivity in the liquid analytical bend. Considering the LOD and LOQ in the gaseous phase, the values in nanograms tend to be higher than those in the liquid period. This research shows that the measurement of formaldehyde in ambient air are at the mercy of prejudice because of variations in derivatization response efficiency. But, the results prove the efficiency of forma