废水中溶解气体检测方案

Total Residual Chlorine inWastewater Star SeriesMethod Note M-1010-E 03/05 RevB Total Residual Chlorine inWastewater Calibration and Analysis ·Chlorine Introduction For instruments with direct concentration readout capability， consult meter manual for correct directmeasurement procedures. Brief procedures for all meter types are found in the section How Ion-SelectiveElectrode Measurements are made. ·Wastewater·Residual ChlorineElectrode (ISE) 1. Allow all the standards and the samples to attain room temperature for precise measurements since theelectrodes are temperature sensitive. This procedure determines total residual chlorine in all waters and wastewaters regardless of color orturbidity. The direct concentration readout procedure measures from 0.1 and 10 ppm chlorine. Higherconcentrations are easily analyzed after dilution. The U.S. EPA has approved the electrode procedure. TheOrion 9770BNWP Residual Chlorine allows total residual chlorine to be measured quickly and accurately.This electrode method is EPA approved for drinking and wastewater analysis (EPA No.330.5). 2 Calibrate the meter using the prepared standard， stirring the standard at a uniform rate. 3. If you instrument requires a calibration curve， use the 1 ppm as the calibration standard and usea slope value of 29.0mV to determine the calibration curve. The electrode and the meter are nowcalibrated 0.1 to 10 ppm chlorine， when sample analysis is carried out. 4 Rinse electrodes with deionized or deionized water between measurements. Shake after rinsing toprevent solution carry-over. Do not wipe or rub the sensing element. 5. Measure samples， stirring at the same uniform rate used for calibrating the standards， and rinsinggelectrodes in deionized water between measurements. 7. Pipette (1 mL) Required Solutions Cat. No. 1. Standard solution， 100 ppm 977007 2. Iodine reagent for chlorine electrode，5X5 mL 977010 3. Acid reagent 475 mL 977011 4. Deionized water Calibration Standard Preparation 1. Transfer 100 mL of the 1 ppm standard into a 150 mL beaker and stir. Use this as the only standardused for calibration. 2.The slope used should be 29.0mV as verified in the slope check procedure in the electrodeinstructions manual. Sample Preparation 1. Store about 1 liter of effluent wastewater just prior to the analysis into a beaker to maintain theconsistency of the chlorine content in that particular “batch"of water. 2.P1ipet 1.0 mL each of the Acid reagent and Iodide Reagent into a 100 mL volumetric flask. Dilute tothe volume with the sample and mix thoroughly. Let the solution stand for about 2 minutes to allowcomplete reaction. Pour the contents of the flask into a beaker and stir. Cover the beaker with awatch glass. 2. Repeat this procedure three to five times to obtain five readings of the same for consistent results. ( Environmental Instruments Water Analysis Instruments ) Registered 166 Cummings CenterBeverly， MA 01915 USAM-1010-E 03/05 RevE248070-001 Toll Free： 1-800-225-1480Tel：1-978-232-6000Dom. Fax：1-978-232-6015Intl Fax： 978-232-6031www.thermo.com/waterO 2005 Thermo Electron Corporation Is O 9001：2000 All rights reserved Total Residual Chlorine inWastewater Meter Setup-4 Star benchtop Results Water ppm Chlorine Sample #1： 0.0004 Sample #2： 0.0003Sample #3： 0.，0003 Sample #4： 0.0002 Sample #5： 0.0003 Mean： 0.0003 Standard Deviation： 0.0001 %CV： 23.6 Electrode Storage . For storage， Rinse the electrode and store dry. If the electrode becomes sluggish and drifty， it may be coatedwith a deposit. Soak electrode in a mild laboratory detergent and water mixture for approximately 10 minutesRinse well. If electrode does not respond to cleaning， or if the electrode has been exposed to mercury ions，polish the elements with Orion Polishing Strips. Equipment Setup Electrode Setup -Residual Chlorine electrode 1.Assemble the combination Chlorine Electrode and check the electrode operation (Slope) as described inthe electrode instruction manuals. 2. Prepare a 1 ppm standard by pipetting 1.0 mL each of the 100 ppm residual chlorine standard， Acidreagent， and Iodide Reagent into a 100 mL volumetric flask. Swirl for about 2 minutes to completereaction. Dilute to the mark with deionized water. Swirl to mix. 3 Connect the residual chlorine combination electrode to the meter as specified in the meterinstruction manual.1. For initial meter setup please follow the steps in the Quick Start Guide which is attached to the meter itself.The Quick Start Guide also contains a layout of the meter keyboard for reference. Please note words in allcapitals such as POWER indicates a key on the meter， and words in quotations such as“Unit"indicates adisplay on the meter screen. Connect the electrode to the meter 2 Press the POWER key on the meter to turn meter on. 3.Note that the arrow on the left of the screen indicates the active line. If not the top line is not active， pressthe LINE SELECTION key to change the selected line to the top line. Then press the UP or DOWNarrow keys to change the measurement mode of the top line to ISE. 4.1Press the SETUP key to enter ISE Setup. Press the LINE SELECTION key to select the bottom line.Press UP or DOWN arrow keys to select“3”for “rES". Press LINE SELECTION key to accept value. 5. Press LINE SELECTION key to select middle line， and press DOWN arrow key to select “nLln”. 6.Press the LINE SELECTION key to select the bottom line. Press UP or DOWN arrow keys to select“off”for “nLln". Press LINE SELECTION key to accept value. 7.Press LINE SELECTION key to select middle line， and press DOWN arrow key to select “rAng”. 8.Press the LINE SELECTION key to select the bottom line. Press UP or DOWN arrow keys to select“HigH" for "rAng". Press LINE SELECTION key to accept value. 9P.ress LINE SELECTION key to select middle line， and press DOWN arrow key to select“Unit". 10. Press the LINE SELECTION key to select the bottom line. Press UP or DOWN arrow keys to select“mGL” for“Unit”. Press LINE SELECTION key to accept value. 11. Press MEASURE key to return to measurement mode. If all steps were followed correctly the meter display will show three digits in the top line and"ISE： mg/L to theC1right of the top line. The meter and electrode are now ready for calibration. www.thermo.com of of ofof