Determination method for trace impurity elements such as sodium, magnesium, calcium, iron and lead in high-purity boric acid
A technology of high-purity boric acid and determination method, which is applied in the preparation of test samples, measurement of color/spectral properties, thermal excitation analysis, etc. The effect of eliminating matrix differences and high sensitivity
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[0040] Such as figure 1 As shown, the method for determining trace impurity elements sodium, magnesium, calcium, iron, and lead in high-purity boric acid provided by the present invention is as follows:
[0041] Accurately weigh 5.000 g of the high-purity boric acid sample to be tested, pour it into a polytetrafluoroethylene (PTFE) crucible, add 10 mL of hydrofluoric acid (HF) and 5 mL of hydrochloric acid (HCl), and steam it on a 200 ℃ temperature-controlled electric heating plate dry;
[0042] Add 5 mL HF and evaporate to dryness again to remove the boric acid matrix as much as possible;
[0043] Add 5 mL of fresh aqua regia 1:1 (v / v) and 10 mL of ultrapure water into a polytetrafluoroethylene (PTFE) crucible, heat it to boiling on a hot plate, take it off after 5 minutes, and let it cool naturally Dilute the volume with ultrapure water to a 25 mL colorimetric tube with stopper, shake well for testing;
[0044] The working conditions of the selected instruments are as follows:
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