Phenol interference in the mercury-free pararosaniline method and the chromotropic acid method for formaldehyde.
The modified pararosaniline method for formaldehyde which uses no poisonous mercury reagent is not affected by phenol/formaldehyde ratios ranging from 1 to 100, whereas such ratios caused almost total inhibition of the chromotropic acid method, even if water, 1% sodium bisulfite or 0.01 N H2SO4 were used to simulate different collection media. No influence of phenol also occurred even for 11 days of storage at room temperature before analysis.
D000395:Air Pollutants, Occupational / Q000032:analysis*; D004355:Drug Stability; D005557:Formaldehyde / Q000032:analysis*; D007202:Indicators and Reagents; D009282:Naphthalenesulfonates; D010636:Phenols / Q000032:analysis; D012394:Rosaniline Dyes; D013053:Spectrophotometry; D014052:Toluidines
D000395:Air Pollutants, Occupational; D007202:Indicators and Reagents; D009282:Naphthalenesulfonates; D010636:Phenols; D012394:Rosaniline Dyes; D014052:Toluidines; D005557:Formaldehyde; C005409:pararosaniline; C020996:chromotropic acid