| 摘要 |
An improved flow independent method for electrochemical monitoring of a sample stream for the total concentration of a series of ionic species of the form X-n, HmX-n+m where n varies from 1 to m and X-n is an anion selected from the group consisting of fluoride ion, F-, and sulfide ion S-2. The pH of the sample stream is adjusted to a value below the pka of the neutral most protonated species of the series. A first electrode sensitive to the activity of X-n is placed in the adjusted stream. The electric potential developed thereby is measured. A second electrode sensitive to the activity of hydrogen ion H+ is also placed in the adjusted stream. The electric potential developed thereby is also measured. The potential difference between the first and second electrode is a measure of the total concentration of the series X-n, HmX-n+m. |
