Method for measuring nickel content in low alloy steel by spectrophotometry
A spectrophotometric, low-alloy steel technology, applied in color/spectral characteristic measurement, analysis through chemical reaction of materials, material analysis through observation of the influence of chemical indicators, etc., can solve the difficulty of ensuring accurate measurement results Accuracy and precision, interference and other issues
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[0053] Example 1 Weigh 0.5000 g of the sample (standard sample 1#), accurate to 0.0001 g.
[0054] Place the said sample in a 100mL steel measuring flask, add 5mL of concentrated hydrochloric acid and concentrated nitric acid, heat, and when the sample dissolves, add distilled water, 1mL each time, until small bubbles in the solution can be observed Stop adding distilled water until it disappears and large bubbles begin to appear. At this time, add a total of 5 mL of distilled water and continue heating until the sample is completely dissolved.
[0055] Add 5 mL of perchloric acid to the dissolved sample, evaporate to the perchloric acid smoke, and cool slightly. Add 20 mL of distilled water to dissolve the salts, dilute to the mark with water, and shake well to obtain solution a.
[0056] Accurately pipette 10.00mL test solution from solution a into a 100mL volumetric flask, add 7mL sodium potassium tartrate, 7mL ammonium citrate, 10mL sodium hydroxide, 2mL ammonium persulfate, 10m...
Example Embodiment
[0063] Example 2 Weigh 0.5000 g of the sample (standard sample 1#), accurate to 0.0001 g.
[0064] The process of dissolving the sample is the same as in Example 1.
[0065] Add 5 mL of perchloric acid to the dissolved sample, evaporate to the perchloric acid smoke, and cool slightly. Add 20 mL of distilled water to dissolve the salts, dilute to the mark with water, and shake well to obtain solution a.
[0066] Accurately pipette 10.00mL test solution from solution a into a 100mL volumetric flask, add 10mL sodium potassium tartrate, 10mL ammonium citrate, 10mL sodium hydroxide, 2mL ammonium persulfate, 10mL diacetyl oxime, dilute to the mark with water, mix The order of adding the masking agent is: first sodium potassium tartrate, then ammonium citrate.
[0067] Place for 10-20min, that is, after the chelation reaction is complete, take the reference solution as the reference, and compare the color on the spectrophotometer at 530nm, and the absorbance A is measured 1 .
[0068] Among ...
Example Embodiment
[0072] Example 3 Weigh 0.5000 g of the sample (standard sample 1#), accurate to 0.0001 g.
[0073] The process of dissolving the sample is the same as in Example 1.
[0074] Add 5 mL of perchloric acid to the dissolved sample, evaporate to the perchloric acid smoke, and cool slightly. Add 20 mL of distilled water to dissolve the salts, dilute to the mark with water, and shake well to obtain solution a.
[0075] Accurately pipette 10.00mL test solution from solution a into a 100mL volumetric flask, add 12mL sodium potassium tartrate, 12mL ammonium citrate, 10mL sodium hydroxide, 2mL ammonium persulfate, 10mL diacetyl oxime, dilute to the mark with water, mix The order of adding the masking agent is: first sodium potassium tartrate, then ammonium citrate.
[0076] Place for 10-20min, that is, after the chelation reaction is complete, take the reference solution as the reference, and compare the color on the spectrophotometer at 530nm, and the absorbance A is measured 1 .
[0077] Among ...
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