Analysis method of total chlorine and residual chlorine
An analytical method and technology for residual chlorine, which can be used in the analysis of materials, material analysis by optical means, and analysis by chemical reaction of materials, etc., can solve the problems of inaccurate residual chlorine measurement results and inaccurate total chlorine measurement results.
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Embodiment 1
[0075] The analyzed sample was tap water.
[0076] Take 10ml of tap water sample to the detection pool of the total chlorine automatic analyzer, slowly add 0.5mL of disodium hydrogen phosphate buffer solution, adjust the pH value of the sample to 6.2, add 0.5mL of 2.5% potassium iodide solution, and heat the sample to be tested to above 60°C , and blow air into the sample to volatilize the generated iodine element and expel it from the sample. After the iodine element volatilizes completely, record the absorbance signal value V1 as 0.1087,
[0077]After cleaning the instrument, draw 10ml of tap water sample again to the detection pool of the total chlorine automatic analyzer, slowly add 0.5mL of disodium hydrogen phosphate buffer solution, add 0.5mL of 2.5% potassium iodide solution, add 0.5ml of DPD sulfate color reagent solution, mix Uniform, record absorbance signal value V2 is 0.3412,
[0078] The value 0.2325 of the result V2-V1 of measurement is substituted into standar...
Embodiment 2
[0081] The analyzed sample was tap water.
[0082] Take 10ml of tap water sample to the detection pool of the total chlorine automatic analyzer, slowly add 0.5mL of disodium hydrogen phosphate buffer solution, adjust the pH value of the sample to 6.2, add 0.5mL of 2.5% potassium bromide solution, and heat the sample to be tested to 60 ℃, and blow air into the sample to volatilize the generated bromine element and expel it from the sample. After the bromine element volatilizes completely, record the absorbance signal value V1 as 0.0996,
[0083] After cleaning the instrument, draw 10ml of tap water sample again to the detection pool of the total chlorine automatic analyzer, slowly add 0.5mL of disodium hydrogen phosphate buffer solution, add 0.5mL of 2.5% potassium bromide solution, and add 0.5ml of DPD sulfate color developer solution , mix evenly, and record the absorbance signal value V2 as 0.3288,
[0084] Substitute the values of the measured results V2-V1 into the stan...
Embodiment 3
[0087] The analysis sample is a water sample containing relatively large turbidity and chromaticity. The yellow soil is used as the matrix, and the water sample is prepared with tap water. After mixing evenly, the measured turbidity is 148NTU.
[0088] Take 10ml of the above sample to the detection cell of the automatic analyzer, slowly add 0.5mL of disodium hydrogen phosphate buffer solution, add 0.5mL of potassium iodide solution, heat the sample to be tested to above 60°C, and blow air into the sample to make the generated The iodine element volatilizes and is expelled from the sample. After the iodine element volatilizes completely, record the absorbance signal value V1 at this time as 0.3569;
[0089] After cleaning the instrument, take 10ml of the above sample again to the detection pool of the automatic analyzer, slowly add 0.5ml of disodium hydrogen phosphate buffer solution, add 0.5ml of DPD sulfate chromogen solution, add 0.5ml of potassium iodide solution, and mix ev...
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