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Standard Test Method for pH of Atmospheric Wet Deposition Samples by Electrometric Determination
Automaticky přeložený název:
Standardní zkušební metoda pro pH Atmospheric mokré depozice vzorků electrometric stanovení
NORMA vydána dne 1.8.2008
Označení normy: ASTM D5015-02(2008)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.8.2008
Kód zboží: NS-29523
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
atmospheric deposition, hydrogen ion, low ionic strength solutions, pH, precipitation, wet deposition, Acidity, alkalinity, pH--chemicals, Acid rain, Atmospheric wet deposition (AWD), Calibration--air/atmospheric analysis instruments, Electrodes, Electrometric determination, Glass electrodes, Hydrogen ion exchange, Low ionic strength solutions, Nernstian response, pH, Residual junction/streaming potential, Workplace air/atmospheres, ICS Number Code 71.040.50 (Physicochemical methods of analysis)
Significance and Use | ||||||||||||||||||
The accurate measurement of pH in atmospheric wet deposition is an essential and critically important component in the monitoring of atmospheric wet deposition for trends in the acidity and overall air quality. Atmospheric wet deposition is, in general, a low ionic strength, unbuffered solution. Special precautions, as detailed in this test method, are necessary to ensure accurate pH measurements (1). Special emphasis must be placed on minimizing the effect of the residual liquid junction potential bias. This test method is applicable only to the measurement of pH in atmospheric wet deposition. Its use in other applications may result in inaccuracies. Fig. 1 provides a frequency distribution of precipitation pH values measured in conjunction with a national monitoring program within the United States. These data are an indication of the range of pH values common to atmospheric wet deposition.
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1. Scope | ||||||||||||||||||
1.1 This test method is applicable to the determination of pH in atmospheric wet deposition samples by electrometric measurement using either a pH half cell with a reference probe or a combination electrode as the sensor. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||||||||
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