(Use the equation below to find the exact concentration.)Ĥ.
This makes an approximately 0.3 mg/L Cl2 standard solution. Fill the flask to the mark with deionized water, stopper, and invert repeatedly to mix. Pipet 1 mL of the chlorine standard solution into the flask.ģ. Open a chlorine standard solution ampule.Ģ. Fill a 200-mL volumetric flask approximately half full with deionized water. Pipette, Variable Volume, 1.0 - 5.0 mL (Product # BBP065) Flask, volumetric Class A, Glass, 200 mL (Product #1457445) Chlorine Standard Solution, 50-75 mg/L as Cl 2, pk/16 - 10 mL Voluette Ampules (NIST) (actual concentration on label) (Product # 1426810) The following procedure is one way to accurately prepare 6 chlorine calibration standards from a Hach Chlorine Standard Solution: For example, if using a Hach method that measures from 0 - 2.00 mg/L, prepare calibration standard concentrations that span this range. The calibration standards should span the full concentration range of the test. In order to calibrate the colorimeter, several primary standards (typically 5 to 7) at different concentrations will need to be prepared. However, the instrument does accept a user-prepared calibration curve, if the user chooses to do so. The DR300 for chlorine (Product # LPV40) and the Pocket Colorimeter™ II, Chlorine (Free and Total) (Product # 5870000) is factory calibrated and does not need to be user calibrated.
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