Method for determining fluorine content in nickel-cobalt-manganese ternary material
A ternary material, nickel-cobalt-manganese technology, which is used in measurement devices, analytical materials, chemical method analysis, etc., can solve the problems of unstable measurement results and large errors, and achieve fast measurement speed, convenient operation and high measurement accuracy. Effect
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Embodiment 1
[0051] This embodiment provides a method for measuring the fluorine content in the nickel-cobalt-manganese ternary material, specifically as follows:
[0052] 1. Reagent preparation:
[0053] 0.1% neutral red solution, 20% sodium hydroxide solution (weigh 20g of analytically pure sodium hydroxide, dissolve it in deionized water to 100ml), 1+1 hydrochloric acid solution (the volume ratio of hydrochloric acid to water is 1:1), 10μg / ml and 100μg / ml 5) Fluoride ion standard solution, trisodium citrate, sodium acetate trihydrate, nickel-cobalt-manganese ternary material to be tested.
[0054] 2. Prepare trisodium citrate buffer solution
[0055] Weigh 294 grams of trisodium citrate and 20 grams of sodium acetate trihydrate into a beaker, add about 900ml of water, stir until dissolved, slowly add acetic acid dropwise to make the pH between 6.0 and 6.5 (tested with precision test paper), and dilute to 1000ml .
[0056] 3. Draw the fluoride ion concentration-potential comparison ta...
Embodiment 2
[0074] The difference with embodiment 1 is:
[0075] Sample determination
[0076] a. Weigh 5.0000g ± 0.0010g of the sample into a beaker, rinse with water, add hydrochloric acid to heat and dissolve the sample to make it clear. Add an appropriate amount of 20% NaOH to form a complete precipitation of nickel-cobalt-manganese hydroxide (the solution is alkaline);
[0077] b. Filter the nickel-cobalt-manganese hydroxide precipitate with medium-speed quantitative filter paper;
[0078] c. Add 5ml trisodium citrate buffer solution to the filtrate, add a drop of neutral red (the solution is alkaline yellow);
[0079] d, then adjust to red with 1:1 hydrochloric acid;
[0080] e. Add 5ml of trisodium citrate buffer solution, dilute to 50ml, and wait for the test;
[0081] f. Put in the stirrer, insert the electrode and measure the potential value E as -331mv.
[0082] Substituting into Table 1, the concentration of fluorine ion is about 5 μg / 50ml, then the content of fluorine el...
Embodiment 3
[0086] The difference with embodiment 1 is:
[0087] Sample determination
[0088] a. Weigh 10.0000g ± 0.0010g of the sample into a beaker, rinse with water, add hydrochloric acid to heat and dissolve the sample to make it clear. Add an appropriate amount of 20% NaOH to form a complete precipitation of nickel-cobalt-manganese hydroxide (the solution is alkaline);
[0089] b. Filter the nickel-cobalt-manganese hydroxide precipitate with medium-speed quantitative filter paper;
[0090] c. Add 5ml trisodium citrate buffer solution to the filtrate, add a drop of neutral red (the solution is alkaline yellow);
[0091] d, then adjust to red with 1:1 hydrochloric acid;
[0092] e. Add 5ml of trisodium citrate buffer solution, dilute to 50ml, and wait for the test;
[0093] f. Put in the stirrer, insert the electrode and measure the potential value E as -312mv.
[0094] Substituting into Table 1, the concentration of fluorine ion is about 10μg / 50ml, then the content of fluorine e...
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