Determination of ammonia in air and aqueous samples with a gas-sensitive semiconductor capacitor

Winquist, FredrikLinköpings universitet,Tillämpad Fysik,Tekniska högskolan (författare)

The properties of a new type of ammonia gas-sensitive semiconductor capacitor are described. The sensor is based on a palladium MOS field-effect capacitor with a thin layer (3 nm) of iridium surrounding the palladium gate. The lower limit of detection for ammonia in air is 1 ppm (0.59 mg kg−1). The analytical characteristics and temperature-dependence of the sensor in measurements of ammonia in air are evaluated. Ammonia in aqueous solutions is determined by the use of a continuous flow system utilizing a gaspermeable membrane in combination with the sensor. The calibration plot of the voltage drop of the capacitor vs. ammonia concentration in 150-μl samples is linear in the concentration range 0.2 × 10−6–5 × 10−5 M. Ammonia is determined in rain and river water as well as in whole blood and blood serum; 15 samples per hour can be assayed. Analytical recovery studies and the selectivity properties of the system are described and discussed. Finally, the properties of the flow-through system in continuous monitoring are described.

Spetz, AnitaLinköpings universitet,Tillämpad Fysik,Tekniska högskolan(Swepub:liu)anill63 (författare)
Lundström, IngemarLinköpings universitet,Tillämpad Fysik,Tekniska högskolan(Swepub:liu)inglu57 (författare)
Danielsson, B.University of Lund, Sweden (författare)
Linköpings universitetTillämpad Fysik (creator_code:org_t)

Av författaren/redakt...: Winquist, Fredri ...; Spetz, Anita; Lundström, Ingem ...; Danielsson, B.

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