废水中物理指标检测方案

智能文字提取功能测试中

pH inWastewaterpHinWastewater pHinWastewater Calibration and Analysis 1.Allow all the standards and the samples to attain room temperature for precise measurements since themeasurement is temperature sensitive. 2. Calibrate the meter using the pH 7 and pH 4.01 buffers， stirring the solutions at a uniform rate. 3.Place the electrode and stirrer into the beaker with the pH 7 buffer with the electrode tip fully immersed in the solution. The stirrer should be positioned slightly below the tip of the electrode.Press the CALIBRATE key. 4.Wait for stable reading (1-2 minutes). Enter standard value of 7.00 using the UP and DOWN arrowkeys and the DECIMAL /DIGIT key. 5.Press CALIBRATE key to accept 7.00 standard 6.Rinse electrode thoroughly with deionized water and then with the next standard to be measured. 7.P]lace the electrode into beaker with the pH 4.01 buffer standard with the electrode tip fully immersedin the solution. 8.Wait for stable reading (1-2 minutes). Enter standard of 4.01 using the UP and DOWN arrow keysand the DECIMAL/DIGIT key. 9. Press MEASURE key to accept 4.01 standard and to move to the measure mode of the meter. 10. Rinse the electrode thoroughly with deionized water and then with the next solution to be measured. 11. Place the electrode into prepared sample with the electrode tip fully immersed in the solution. Pressthe MEASURE key on the meter， the pH icon will flash as the measurement is being made. The pHicon will become solid and the display value will freeze when a stable reading is achieved. This value islogged and printed automatically. 11. Repeat steps 10 and 11 for additional samples. Remember to rinse the electrode with deionized waterbetween measurements. Upon completion of samples， rinse the electrode with deionized water andstore the electrode according to instructions in the “Storage"section of this method note. Introduction The following method utilizes the Orion ROSS" Combination with epoxy body pH electrode to measurepH in wastewater that can contain variable composition of elements and chemicals. Under these conditions， ROSS Combination pH electrodes make measurements quickly and precisely. Recommended Equipment Cat. No. pH Application Package (includes all items with a Cat. No.) 1010110 1. 3-Star portable pH meter 1212000 2. Orion ROSS Sure-Flow° Combination with Epoxy Body 8165BNWP 3. Rubber boot and storage sleeve 1210002 4. Electrode storage sleeve 1210003 5. Beakers (100 mL) 6. Graduated cylinder (100 mL) Required Solutions Cat. No. 1. ROSS reference filling solution 810007 2. Stain Lifter， Pkg. 2 oz. bottle 510015 3. pH 7.00 Buffer in 10 pack 910710 4.Electrode storage solution 910001 5. Deionized water Calibration Standard Preparation 1. Ensure that all buffers are at the same temperature. 2. Select two buffers with bracket the expected sample pH. The first should be near the electrodeisopotential point (pH 7) and the second near the expected sample pH. 3.Using a graduated cylinder， transfer 60 mL of the pH 7.00 buffer into a 100 mL beaker. 4. Using a graduated cylinder， transfer 60 mL of the second buffer into a 100 mL beaker. Sample Preparation 1. Using a graduated cylinder， measure 60 mL of the sample into a 100 mL beaker. Mix sample with theelectrode. 2.Repeat this procedure for additional measurements. Results Five aliquots of the wastewater are measured. The obtained pH results demonstrated a good repeatability. Wastewater pH Sample #1： 6.30 Sample # 2： 6.29 Sample # 3： 6.31 Sample # 4： 6.31 Sample #5： 6.31 Mean： 6.30 Standard Deviation： 9.01 %CV： 0.14 Electrode Storage For short-term storage， soak electrode in pH Electrode Storage Solution， Orion 910001. For long-term storageperiod， the reference chamber should be filled and the fill hole securely covered. Cover the sensing element andreference junction with its protective cap containing a few drop of storage solution. Equipment Setup Electrode Setup -ROSS 1.Remove the protective shipping cap from sensing element and save for storage. 2..Clean any salt deposits from exterior by rinsing with deionized water. 3. Uncover filling hole by removing plastic sleeve， and add ROSS Internal Filling Solution， Orion No.810007， to electrode. To maintain an adequate flow rate， the level of filling solution must cover the coiland be at least one inch above the sample level when immersed. 4. Place the electrode in the electrode holder and suspend in air for 15 minutes to thoroughly wet thereference junction. Once junction is wet， do not allow the electrode to dry out. 5.Shake down the electrode to remove air bubbles. For initial meter setup， follow the steps in the Quick Reference Guide attached to the meter itself. The QuickStart Guide also contains a layout of the meter keypad for reference. The words in this method represented inall capital letters， such as POWER， indicate a key on the meter， and words in quotations such as “Unit"indicateinformation on the meter display. 1. 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 active， press theLINE SELECTION key to change the selected line to the top line. Then press the UP or DOWN arrowkeys to change the measurement mode of the top line to pH. 4 Press the SETUP key to enter pH Setup. Press the LINE SELECTION key to select the middle line.Press the UP or DOWN arrow keys to select "rES"， which is resolution. 5.. .Press the LINE SELECTION key to select the bottom line. Press UP or DOWN arrow keys to select“0.01”for "rES”， which is an abbreviation for resolution or number of significant digits. Press LINESELECTION key to accept value. 6.Press LINE SELECTION key to select middle line， and press DOWN arrow key to select“bUF”， which iswhich is pH buffer. 7.Press the LINE SELECTION key to select the bottom line. Press UP or DOWN arrow keys to select“USA”which is US/Orion buffers. 8.Press LINE SELECTION key to accept value. 9. Press the LINE SELECTION key to accept and select the pH setup menu line (top line). 10. 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 “pH" to the rightof the top line. The meter and electrode are now ready for calibration. www.thermo.com of of ofof