YBB 60432012 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| YBB60432012 | English | 125 |
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Determination of Boron Oxide
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YBB6: ---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YBB6
YBB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Determination of boron oxide
Determination of boron oxide
This method is suitable for the determination of boron trioxide content in various types of
medicinal glass packaging materials.
This method is to grind and dry the test sample; then melt it with alkali and decompose it with
acid. Add calcium carbonate, to make the boron form water-soluble calcium borate, to separate
it from other impurity elements. Add mannitol, to quantitatively convert boric acid into alcohol
boric acid. Use phenolphthalein as an indicator. Use sodium hydroxide titrant for titration.
Calculate the boron trioxide content, based on the volume of sodium hydroxide titrant
consumed.
Determination method
Take the test sample (there shall be no printing). Clean, crush, grind it to fine powder (the
particle size shall be less than 100 µm). Dry it at 105 °C ~ 110 °C for 1 hour. Put it in a desiccator,
to cool for 1 hour. Take about 0.5 g of fine powder. Weigh it accurately. Put it in a platinum
crucible (or silver crucible, nickel crucible). Add 4 g of anhydrous sodium carbonate (or 4 g of
sodium hydroxide). Melt and let it cool. Use hot water to wash out the frit, in a 300 mL beaker.
Add 20 mL of concentrated hydrochloric acid solution, to decompose the frit. Use a small
amount (1→2) of hydrochloric acid, to clean the crucible. Combine the washing liquid in the
beaker. After the frit is completely decomposed, use calcium carbonate to neutralize the
remaining acid. Add an excess of 4 g of calcium carbonate. Place the beaker in a water bath, to
boil it for about 30 minutes. Use qualitative rapid filter paper to filter it. Add a little EDTA
(ethylene diamine tetraacetic acid). Boil it. Remove and cool. Add two drops of 0.1% methyl
red indicator solution. Use 0.1 mol/L sodium hydroxide and 0.1 mol/L hydrochloric acid, to
make the solution neutral (i.e., the solution turns bright yellow). Add 1 mL of 0.1%
phenolphthalein indicator and about 2 g ~ 3 g of mannitol. Use 0.1 mol/L sodium hydroxide
titration solution, to titrate it to a light red color. Repeat these steps, until the red color does not
fade after adding mannitol. Calculation of results (results shall be expressed to two decimal
places)
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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