Standard Practice for Planning the Sampling of the Ambient Atmosphere

Importancia y uso:

5.1 Since the analysis of the atmosphere is influenced by phenomena in which all factors except the method of sampling and analytical procedure are beyond the control of the investigator, statistical consideration must be given to determine the adequacy of the number of samples obtained, the length of time that the sampling program is carried out, and the number of sites sampled. The purpose of the sampling and the characteristics of the contaminant to be measured will have an influence in determining this adequacy. Regular, or if possible, continuous measurements of the contaminant with simultaneous pertinent meteorological observations should be obtained during all seasons of the year. Statistical techniques may then be applied to determine the influence of the meteorological variables on the concentrations measured (2).

5.2 Statistical methods may be used for the interpretation of all of the data available (2). Trends of patterns and relationships between variables of statistical significance may be detected. Much of the validity of the results will depend, however, on the comprehensiveness of the analysis and the location and contaminant measured. For example, if 24-h samples of suspended particulate matter are obtained only periodically (for example, every 6 or 8 days throughout the year), the geometric mean of the measured concentrations is representative of the median value assuming the data are log normally distributed. The geometric mean level may be used to compare the air quality at different locations at which such regular but intermittent observations of suspended particulate matter are made.

Subcomité:

D22.03.02

Referida por:

D1356-20A, D6146-97R18, D1356-20A, D3614-07R21, D1356-20A, D5111-12R20, D4600-22, D2913-20, D3162-21, D6561-20, D8526-23, D3608-19, D3614-07R21, D6281-23, D3267-20, D5932-20, D3268-91R18, D6494-22, D7297-21, D5836-20, D6209-21, D4185-23, D6562-20, D5149-24, D3266-91R18, E0337-15R23, D6306-17R24, D3249-95R19, D3162-21, D1607-91R18E01, D5156-22, D7201-06R20, D5953M-23, D2914-15R22, D5466-21, D2010_D2010M-98R24, D4096-17R23, D6281-23, D7614-20, D5953M-23, D7201-06R20, D6209-21, D3824-20, D8460-22, D5075-01R22

Volúmen:

11.07

Número ICS:

13.040.20 (Ambient atmospheres)

Palabras clave:

ambient atmospheres; sampling;