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Water quality measurement is a critical but time-consuming process, usually involving a wide range of quantitative analysis methods. There are many types of water quality analysis, from basic field testing of a single analyte to laboratory-based comprehensive multi-component instrumental analysis.
This article outlines the automatic potential measurement of six key parameters of water: conductivity, pH, total alkalinity, total hardness, chloride and fluoride content.
Accurately weigh a total of 37.224 g EDTA into a 1000 mL volumetric flask. Before making up the volume with additional deionized water, dissolve it in approximately 500 mL of deionized water.
2. 0.01 mol/L AgNO3:
Accurately weigh a total of 16.987 g AgNO3 into a 1000 mL volumetric flask, dissolve it in approximately 200 mL deionized water, and then replenish the volume with deionized water.
3. 0.01 mol/L ½ H2SO4:
Add a total of 0.544 mL of 98% H2SO4 to a 1000 mL volumetric flask containing 500 mL of deionized water. This can cause heat, so let the sample cool to room temperature and then dilute to 1000 mL with deionized water.
Add a total of 111 ml of 25% ammonia to a 500 mL volumetric flask containing 100 mL of deionized water. This volume is made up with water.
Dissolve and dilute a total of 0.1 g of EBT in ethanol to 100 mL.
Image source: METTLER TOLEDO-Titration
6. 0.01 mol/L zinc sulfate (ZnSO4):
Dilute a total of 20 mL of 0.1 mol/L ZnSO4 solution (Merck-1.08879.1000) to 200 mL with deionized water.
7. 0.01 mol/L sodium chloride (NaCl):
Accurately weigh 0.5844 g of NaCl and transfer to a 1000 mL volumetric flask. Before making up the volume with additional deionized water, dissolve it in 50 mL of deionized water.
0.01 mol/L ½ H2SO43
Use the following steps for tap water analysis. Two beakers must be used for each sample. For each sample, prepare a beaker with a 60 mL sample before placing it on the InMotion Rack.
Prepare another 50 mL water sample, then place the beaker on the InMotion Rack, which contains 60 mL sample.
To start the method, indicate the position of the first beaker with 60 mL of sample and the first beaker with 50 mL of sample. Flush and adjust the sensor before each measurement.
c ½ (H2SO4) = 0.01 mol/L
Chloride, M = 35.55 g/mol, z = 1
Calcium carbonate, M = 100.09 g/mol, z = 1
NaCl, the main standard (0.01 mol/L) = 5.0 mL1
Tris(hydroxymethyl)aminomethane TRIS = 0.05 g – 0.1 g3
Source: METTLER TOLEDO-Titration
The conductivity probe should be located 1 cm below the PerfectION F-. The conductivity is measured using the "conductivity" position of the InMotion Tower, which means that only the conductivity probe can be immersed, thus avoiding any contamination of the PerfectION F-electrolyte.
Both DGi115-SC and PerfectION F- need to be calibrated before analysis-ISE calibration segmentation, pH 3 points linearity.
Each electrode should be carefully cleaned after each analysis. Ensuring that the sensor is flushed and adjusted is critical to obtaining precise and accurate results.
Adjust the output signal of DP5 to 1000mV before use. This is achieved by manually measuring the sensor in deionized water before turning the small knob on the housing to stabilize it for 20 minutes.
Keeping the stirring speed low helps to avoid the formation of bubbles during the titration. This is important because the presence of air bubbles can interfere with the luminosity indication.
Use the following steps to measure:
The flowchart can also be adjusted to suit specific customer needs; for example, the pump used in the current solution can be replaced with a liquid handler, TV6 valve, or reversible pump (SPR 200).
In the event of a shortage of pumps or metering units, the liquid handler can also be used to dispense a range of solvents. It should be noted that the formed sediment must be filtered and classified as special waste. Therefore, the solution must be neutralized before final disposal.
This information is derived from, reviewed and adapted from material provided by Mettler Toledo-Titration.
For more information on this source, please visit METTLER TOLEDO-Titration.
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