| Main Title |
Accuracy of Ross pH Combination Electrodes in Dilute Sulphuric Acid Standards. |
| Author |
Metcalf, R. C. ;
|
| CORP Author |
Lockheed-EMSCO, Las Vegas, NV.;Environmental Monitoring Systems Lab., Las Vegas, NV. |
| Year Published |
1987 |
| Report Number |
EPA-68-03-3249; EPA/600/J-87/327; |
| Stock Number |
PB88-196308 |
| Additional Subjects |
pH ;
Sulfuric acid ;
Electrodes ;
Water pollution ;
Chemical analysis ;
Electrochemistry ;
Environmental tests ;
Reprints ;
Acid rain ;
Environmental monitoring
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB88-196308 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
8p |
| Abstract |
The mean observed pH of a 5.00 plus or minus 0.05 x 0.00001 M H2504 solution was 4.06 plus or minus 0.05 (2s) for 485 pH measurements by seven different operators, using nine Orion Ross Model 81-94b pH combination electrodes and four different pH meters over 8 weeks. Traditional methods using activity coefficients give a pH of 4.005 for this solution and the liquid junction potential error, yields a calculated pH for this standard of 4.030. The difference between the calculated pH, corrected by a larger residual liquid junction potential error than was calculated for this electrode with the currently available methods. Consequently, the assumption of a negligible residual junction potential error in future pH measurements of dilute acid standards is subject to question in accurate work. Further progress in the field seems limited by the non-availability of technological innovations which provide highly reproducible liquid junction potential errors or minimize temperature equilibration errors in pH probes. (Copyright (c) Analyst, November 1987, Vol. 112.) |
| Supplementary Notes |
Pub. in Analyst, v112 p1573-1577 Nov 87. Sponsored by Environmental Monitoring Systems Lab., Las Vegas, NV. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Accuracy of Ross pH Combination Electrodes in Dilute Sulphuric Acid Standards. |
| PUB Date Free Form |
c1987 |
| Category Codes |
68D; 68A |
| NTIS Prices |
Not available NTIS |
| Primary Description |
600/07 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
817624655 |
| Origin |
NTIS |
| Type |
CAT |
