Air analysers

Surrounding Air Analyses. The results of the analyses of the air taken above the Horticulture pit are given in Table VIII for the spring and fall of 1979. Air samples were also taken upwind from the disposal pit and most pesticides were not detected or if detected were at their detection limit of K).l ng/L. Volatilization from the pit may be assumed whenever there is an appreciable increase in pesticide concentration in air over the pit relative to an upwind sample taken at the same time. 

Surrounding Air Analyses. The results of the analyses of the air taken above the Agronomy pit are given in Table XI for June 28, August 14 and August 24, 1979. The interpretation of these re-... 

Atomic emission detectors (AEDs) and mass selective detectors (MSDs) are also being used to enhance selectivity and sensitivity for air analyses (Yamashita et al. 1992). 

Pleil JD, Oliver KD, McClenny WA. 1988. Ambient air analyses using nonspecific flame ionization and electron capture detection compared to specific detection by mass spectroscopy. JAPCA 38 1006-1010. 

Kuntz, R W. Lonneman, G. Namie, and L. A. Hull, Rapid Determination of Aldehydes in Air Analyses, Anal. Lett., 13, 1409- I4f5 (f980). 

Pilz W, Komischke S. 1972. [The determination of vanadium in biological material and in the air. 2. Decomposition of biological material, air analyses]. International Journal of Environmental Analytical Chemistry 1 275-282. (German)... 

Collecting air samples— the sample train, sampling devices, p. 713 Some example air analyses, p. 718 Collecting water samples—surface, groundwater, p. 720... 

FIGURE 19.6 Replicate room air analyses obtained every 30 sec with fast gas chromatography with luminol detection. Arrows point to NO2 (RT = 6 sec) and PAN (RT = 16 sec) peaks. 

The problems associated with the sampling and automation of this stage were dealt with in their corresponding sections, so this section Is exclusively devoted to the automated instrumentation available for this type of sensor. As with water analysers, air analysers are classified into off- and on-line analysers, and the latter in turn Into single-parameter and multiparameter. 

The amount of the air analysed, i.e. the air drawn through the sampling apparatus, may be established in the following ways ... 

The low-volume sampling devices are for aspirating similar amounts of the air analysed as those discussed in Section 5.5.2.1 in connection with sampling procedures for the determination of gaseous pollutants the high-volume ones can handle 20 to 200 cm of air per hour. 

Martos PA and Pawliszyn J (1997) Calibration of solid-phase microextraction for air analyses based on physical chemical properties of the coating. Analytical Chemistry 69 206-215. 

The analytical procedure [49] employs the direct gas sample inlet without complicated sample preparation and selective ion monitoring (SIM). It saves time and minimizes the risk of sample contamination and sample loss during manipulation. Ambient air analyses were performed as follows. A 1-ml sample was injected into a gas chromatograph with a 1-ml glass syringe. The SI spectra of... 

Polycyclic aromatic hydrocarbons (PAHs) are characterized by a diversified group of organic compounds constituted of two or more condensed rings. These substances present a wide distribution in the environment, having their levels already determined in soils, drinking water, rivers, lakes, marine sediments and also in air analyses (Harvey, 1997). 

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