【Daily Question】Chemical Engineering Principles 301: Determining Phosphates in Boiler Water (January 21)
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This post was last edited by “Back to Cambridge” on January 27, 2016, at 13:29. Starting today, the Chemical Engineering Theory section will launch the “Question of the Day” activity, aimed at helping everyone reinforce their basic knowledge of chemical engineering. Subsequently, series such as “Fundamentals of Chemical Engineering”, “Mass Transfer and Separation”, “Chemical Thermodynamics”, and “Chemical Process Technology” will also be introduced. We hope for your active participation! Wishing you all a Merry Christmas~~ For replies to the “Question of the Day” activity, answers can be viewed directly; however, the thread will be closed after one day! ! To encourage continued participation from everyone this year! You get 3 wealth rewards just for participating, and an additional 4 wealth points if you answer correctly~~~ Short answer question: Briefly describe the steps for determining phosphates in boiler water Answer: 1) Adjust the wavelength to 420nm. 2) Keep the power supply stable for 30 minutes. 3) Take 50 ml each of silica-free water and the water sample, pour them into 50 ml colorimetric tubes respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes. 4) Take a 30 ml colorimetric tube and rinse it thoroughly with silica-free water. 5) Use a silicon-free water sample as the reagent blank to measure its absorbance. 6) Determine the phosphate content based on the curve.
1) First, adjust the measurement wavelength to 420nm； 2) Maintain stable power supply for 30 minutes ； 3) Take 50 ml of each of the silicon-free water and the water sample, pour them into 50 ml of colorimetric vessels respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes ； 4) Take a 30 ml cuvette and rinse it thoroughly with silica-free water ； 5) Use a silicon-free water sample as the reagent blank to measure its absorbance ； 6) Calculate the phosphate content based on the curve ；
Briefly describe the steps for measuring phosphates in boiler water? The measurement steps are as follows: 1) First, adjust the measurement wavelength to 420nm ； 2) Maintain stable power supply for 30 minutes ； 3) Take 50 ml of each of the silicon-free water and the water sample, pour them into 50 ml of colorimetric vessels respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes ； 4) Take a 30 ml cuvette and rinse it thoroughly with silica-free water ； 5) Use a silicon-free water sample as the reagent blank to measure its absorbance ； 6) Calculate the phosphate content based on the curve.
1. First, adjust the measurement wavelength to 420nm； 2. Maintain stable power supply for 30 minutes ； 3. Take 50 ml of silicon-free water and 50 ml of the water sample, pour each into a 50 ml colorimetric tube, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes ； 4. Take a 30 ml cuvette and rinse it thoroughly with silicon-free water ； 5. Use a silicon-free water sample as the reagent blank to measure its absorbance ； 6. Calculate the phosphate content based on the curve ；
1) First, adjust the measurement wavelength to 420nm; 2) Keep the power supply stable for 30 minutes; 3) Take 50 ml each of silicon-free water and the water sample, pour them into 50 ml colorimetric tubes respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes; 4) Take a 30 ml colorimetric tube and rinse it thoroughly with silicon-free water; 5) Use the silicon-free water sample as a reagent blank to measure its absorbance; 6) Calculate the content of phosphate based on the curve
1) First, adjust the measurement wavelength to 420nm； 2) Maintain stable power supply for 30 minutes ； 3) Take 50 ml of each of the silicon-free water and the water sample, pour them into 50 ml of colorimetric vessels respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes ； 4) Take a 30 ml cuvette and rinse it thoroughly with silica-free water ； 5) Use a silicon-free water sample as the reagent blank to measure its absorbance ； 6) Calculate the phosphate content based on the curve ；
The measurement steps are as follows: 1) First, adjust the measurement wavelength to 420nm； 2) Maintain stable power supply for 30 minutes ； 3) Take 50 ml of each of the silicon-free water and the water sample, pour them into 50 ml of colorimetric vessels respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes ； 4) Take a 30 ml cuvette and rinse it thoroughly with silica-free water ； 5) Use a silicon-free water sample as the reagent blank to measure its absorbance ； 6) Calculate the phosphate content based on the curve ；
Briefly describe the steps for measuring phosphates in boiler water? Answer: 1) First, adjust the measurement wavelength to 420nm; 2) Keep the power supply stable for 30 minutes; 3) Take 50 ml each of silicon-free water and the water sample, pour them into 50 ml colorimetric tubes respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, shake well and let it stand for 2 minutes; 4) Take a 30 ml colorimetric tube and rinse it thoroughly with silicon-free water; 5) Use the silicon-free water sample as a reagent blank to measure its absorbance; 6) Calculate the phosphate content based on the curve
1) First, adjust the measurement wavelength to 420nm； 2) Maintain stable power supply for 30 minutes ； 3) Take 50 ml of each of the silicon-free water and the water sample, pour them into 50 ml of colorimetric vessels respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes ； 4) Take a 30 ml cuvette and rinse it thoroughly with silica-free water ； 5) Use a silicon-free water sample as the reagent blank to measure its absorbance ； 6) Calculate the phosphate content based on the curve ；
Answer: 1) Adjust the wavelength to 420nm. 2) Keep the power supply stable for 30 minutes. 3) Take 50 ml each of silica-free water and the water sample, pour them into 50 ml colorimetric tubes respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes. 4) Take a 30 ml colorimetric tube and rinse it thoroughly with silica-free water. 5) Use a silicon-free water sample as the reagent blank to measure its absorbance. 6) Determine the phosphate content based on the curve.
Briefly describe the steps for measuring phosphates in boiler water? The measurement steps are as follows: 1) First, adjust the measurement wavelength to 420nm ； 2) Maintain stable power supply for 30 minutes ； 3) Take 50 ml of each of the silicon-free water and the water sample, pour them into 50 ml of colorimetric vessels respectively, add 5 ml of molybdenum-vanadium acid coloring solution to each, mix well and let it stand for 2 minutes ； 4) Take a 30 ml cuvette and rinse it thoroughly with silica-free water ； 5) Use a silicon-free water sample as the reagent blank to measure its absorbance ； 6) Calculate the phosphate content based on the curve.