Hach-Lange POLYMETRON 9240 Operator Manual - Manual (Page 141)

139
Reagent Preparation
14.4 3M KCl
1. To prepare 1L of 3M KCl, rinse at least 3 times a 1L volumetric flask (“A” class) with ultra
pure water. The cleanliness of the flask is essential.
2. Put 223.5 g of KCl inside this flask and add ultra pure water almost to the line delimiting the
volume.
3. Shake the flask until the salt is dissolved and add ultra pure water to the flask up to the line
delimiting the final volume of 1L.
4. Shake a final time.
5. Transfer to the storage canister (label & date).
14.5 0.5M NaNO
3
1. Rinse 3 times a 1L volumetric flask (“A” class) with ultra pure water. The cleanliness of the
flask is essential.
2. Put 42.5g of NaNO
3
inside this flask and add ultra pure water almost to the line delimiting
the volume.
3. Shake the flask until the salt is dissolved and add ultra pure water to the flask until the line
delimiting the final volume of 1L.
4. Shake a final time.
5. Put 500 mL of this solution in the correct bottle for this solution on the analyzer.
6. If you have too much of this solution for this bottle, rinse another plastic bottle and store it in
there (label & date).