Question: These samples were tested using the same nitrate ion-selective electrode and the following results were obtained. Acton Lake: Measured Potential = 2220 mV Western Pond:

These samples were tested using the same nitrate ion-selective electrode and the following results were obtained.

Acton Lake: Measured Potential = 2220 mV

Western Pond: Measured Potential = 2132 mV

Four Mile Creek: Measured Potential = 2361 mV

Using the calibration curve above, match the sample to the correct value for the log of the nitrate concentration (x).

Measured Potential vs. log nitrate concentration 2400 2300 Measured Potential (mv) 2200 Linear Fit for: Data Set | Measured Potential (mv) y = mx+b m (Slope): -420.8 b (Y-Intercept): 2473 Correlation: -0.9978 RMSE: 12.83 2100 0.0 0.2 0.4 0.6 0.8 1.0 log nitrate (NO, "] concentration (mg/L)

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