Catalytic Spectrophotometric determination of trace formaldehyde in textiles

Trace HCHO has obvious catalytic effect in the oxidn.reaction of ethyl orange by KBrO3 in H2SO4 medium at room temp.,and the magnitude of the catalytic effect is correlated to the HCHO concn.A new dynamics method of trace HCHO detn.was set up by the detn.of the absorbance change of the reductant ethyl orange in a detd.period of time.The linear range was 0.3~2.0 μg/mL,and the test limit was 0.047 μ…