Standard Methods 4500-CO2 Carbon Dioxide (2017)

Standard Methods 4500-CO2 Carbon Dioxide (2017)

82,50 €

Detalles

A nomographic and a titrimetric method are described for the estimation of free CO2 in drinking water. The titration may be performed potentiometrically or with phenolphthalein indicator. Properly conducted, the more rapid, simple indicator method is satisfactory for field tests and for control and routine applications if it is understood that the method gives, at best, only an approximation. The nomographic method (B) usually gives a closer estimation of the total free CO2 when the pH and alkalinity determinations are made immediately and correctly at the time of sampling. The pH measurement preferably should be made with an electrometric pH meter, properly calibrated with standard buffer solutions in the pH range of 7 to 8. The error resulting from inaccurate pH measurements grows with an increase in total alkalinity. The calculation of the total CO2, free and combined, is given in Method D. Editorial revisions consist of new references to the QC practices considered to be an integral part of each method.

Información adicional

Autor APHA
Publicado por APHA PUBLICATIONS
Tipo de Documento Procedimiento