| Document ID (ISN) | 76116 |
| CIS number |
01-147 |
| ISSN - Serial title |
0002-8894 - American Industrial Hygiene Association Journal |
| Year |
1999 |
| Convention or series no. |
|
| Author(s) |
Smith R.A., Ascherl F.M. |
| Title |
Issues concerning the measurement of borate in occupational environments |
| Bibliographic information |
Sep.-Oct. 1999, Vol.60, No.5, p.651-658. Illus. 13 ref. |
| Abstract |
Borates are susceptible to weight change due to uptake or loss of water and this hydration instability can lead to gravimetric and interpretation errors in occupational hygiene field sampling of dust. The hydration stability for inhalable borate dust particles (mean diameter 7-22µm) was characterized over a range of ambient temperature and relative humidity conditions simulating field sampling. Borax 10 mol, a fully hydrated borate, has a relatively high vapour pressure to water that led to rapid dehydration with significant weight change. Low hydrate borates, Neobor® borax 5 mol, anhydrous boric acid and anhydrous borax were found to hydrate rapidly with an increase in weight. In contrast, boric acid and borax 5 mol were found to be stable to dehydration under all conditions. Because the specific borate species or borate compounds collected in a 37-mm dust sampler cannot be accurately identified, occupational exposure values should be revised to reflect exposure to boron and exposure values for these borates should be the same based on equivalent boron content. |
| Descriptors (primary) |
borates; determination in air; hydration; dehydration |
| Descriptors (secondary) |
humidity; boron; scanning electron microscopy; borax; disodium tetraborate, anhydrous; boric acid |
| Document type |
D - Periodical articles |
| Country / State or Province | USA |
| Subject(s) |
Toxic and dangerous substances
|
| Broad subject area(s) |
Chemical safety
|
| Browse category(ies) |
Heat and cold
Inorganic substances
|
