Standard Practice for Estimating pH to Verify Status of Aqueous Samples

Importancia y uso:

5.1 This practice is intended for use by samplers, technicians, or analysts to verify that samples are preserved or at the proper pH specified in analytical procedures.

5.2 The pH is indicated within about 1 pH unit for wide-range paper and within 0.5 pH units for narrow-range paper.

5.3 Unless stated otherwise in the test method, a wide-range paper estimating pH within 1 unit is suitable.

5.4 A narrow-range pH paperstrip may be used for test methods with tighter pH requirements; however, accuracy better than ±0.5 pH units of the estimate should not be implied.

5.5 Rapid pH tests allow users to make spot determinations directly without auxiliary equipment.

Subcomité:

D19.05

Volúmen:

11.02

Número ICS:

13.060.01 (Water quality in general)

Palabras clave:

drinking water; environmental; indicator; preservation; sample; wastewater; water;