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Originally posted by ºÚÉ«Óô½ðÏã at 2008-6-23 16:36:
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Tris is a chemical with basic properties, having a pKa of 8.1. It can be used to buffer solutions from drastic pH changes, keeping them in the pH range of 7.0 to 9.0.

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4Â¥2008-06-23 21:37:19
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Boric acid is a weak bacteriostatic and antimicrobial agent, and has been used in topical preparations such as eye lotions, mouthwashes and gargles. It has also been used in US- and Japanese-approved intravenous products.
Boric acid is not used internally owing to its toxicity. It is poisonous by ingestion and moderately toxic by skin contact. Experimentally it has proved to be toxic by inhalation and subcutaneous routes, and moderately toxic by intraperitoneal and intravenous routes.

LD50 (mouse, oral): 3.45 g/kg15
LD50 (mouse, IV): 1.24 g/kg
LD50 (mouse, SC): 1.74 g/kg
LD50 (rat, oral): 2.660 g/kg
LD50 (rat, IV): 1.33 g/kg
LD50 (rat, SC): 1.4 g/kg

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2Â¥2008-06-23 14:19:21
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3Â¥2008-06-23 16:36:02
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THANK YOU VERY MUCH!
5Â¥2008-06-24 15:11:33
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