n my opinion, in this protocol, there are several errors
1. 500 mg / L (0.0357 mol / L) KNO 3 standard solution
0.7221 g KNO 3 does not correspond to 500mg / L. will have to calculate the amount of NO3 that is in KNO3
- with this calculate the ppm of NO3 needed for the calibration line
2. (value 140.86x) do not worry to me it gives me 0.99
3. the calculations to obtain ug / g must take into account the coefficient 0.9 because the weights are frozen
the author can speak respectfully please
7/11/2019 5:04:41 AM Reply