ylenediamine and diaminotoluene. The filters were
dipped in 10% phosphoric acid (10 ml of phosphoric
acid is diluted to 100 ml with methanol (analytical
purity)), allowed to drip off, and dried at 60°C for
1 h. This was done in the laboratory before sampling
(Rudling et al., 1984).
The flow rate was 1 1/min and the sampling time
varied from 10 to 30 minutes for the personal measurements. For the stationary measurements the sampling
periods were approximately 5 hours. The samplers
were kept at +4GC until analysis.
The ammonia analysis was done by ion chromatography. Common interferents for ammonia are
amines. If ion chromatography is used for the analysis,
amines do not interfere. Phenylenediamine and diaminotoluene analysis was made by liquid
chromatography.
Sampling of organic solvents was performed using
charcoal adsorbent tubes connected to a portable
pump (Casella CS1-London Ltd). The flow rate was
lOOml/min. and the sampling time was 5 hours. The
samples were kept at — 20 C until analysis. Charcoal
was used as a sorbent as it currently has the broadest
range of application for organic solvents.
Organic solvents were analysed by gas chromatography (Perkin Elmer, Auto System, 10% FFAP
on 80/100 Chromosorb WAW. temp. 70°C, flow
24ml/min).