Reference method for measuring emissions of nitrogen oxides from stationary sources: chapter 7

7 Safety precautions

• 7.1 The glass sample collection flask, which is evacuated during the sampling procedure, must be covered with tape or foamed plastic to avoid injury in case of implosion or breakage.

• 7.2 The fuming sulphuric acid used in preparing the phenol-disulphonic acid reagent is highly corrosive and fumes in moist air. Protective gloves, apron and face shield should be worn and the reagent preparation carried out in a hood.

• 7.3 Concentrated acids and bases are used throughout the laboratory procedure. Care should be used when adding them to other solutions to avoid overheating and skin contact.

• 7.4 Phenol is absorbed rapidly through the skin; exercise extreme caution during handling.