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Titel:
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An automated field instrument for the determination of acidicgases in air
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Auteur(s):
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Gepubliceerd door:
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Publicatie datum:
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ECN
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1995
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ECN publicatienummer:
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Publicatie type:
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ECN-RX--95-058
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Overig
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Aantal pagina's:
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Volledige tekst:
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24
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Download PDF
(564kB)
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Samenvatting:
An automated field instrument is described for the continuous measurementof soluble acidic gases in ambient air. Sampling of the gases is carried out
by using a wet-rotating annular denuder filled with an aqueous carbonate
absorption solution. After addition of internal standard, the absorption
stream from the denuder is led through one of two injection loops of an
ion-chromatographic system. Separation is carried out on a Dionex IonPac
AS-12A analytical column with suppressed conductivity detection. While one
sample is analysed, a parallel injection loop of the chromatograph is filled
with a next sample. In this way, air concentrations of HCl, HONO, HNO3 and
SO2 can be obtained at approximately 20 min intervals. Detection limits are
0.1 mug/m3 for HCl and HONO and 0.2 mug/m3 for HNO3 and SO2. The
applicability of the system is demonstrated in a measurement campaign at
Petten, The Netherlands. 3 figs., 10 refs.
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