Comments for Lab Science News

Comment on Total Volatile Organic Compound (TVOC) Measurement for LEED/Green Building Evaluation by Alyson Fortune, ALS Environmental

Alyson Fortune, ALS Environmental — Fri, 18 May 2012 16:02:39 +0000

Hi BJ,

Thanks for your comment–we were not trying to be “bold”, so-to-speak…but just trying to state the guidelines that are being followed currently, and the 500 ug/m3 guidance is in the LEED program. As far as other screening values for other constituents, I have also frequently seen maximum allowable concentrations used that are derived from the Chronic Reference Exposure Limits as published by the California EPA, Office of Environmental Health Hazard Assessment. This approach is taken in the more recent ASHRAE 189.1 document which specifically addresses indoor air quality in green buildings. It combines the “TVOC” approach with also monitoring for individual VOCs expected to be related to building materials.

Comment on USP 467 for Residual Solvents: Manufacturers Face Challenges with Pharmaceutical Impurities by William Allen

William Allen — Wed, 16 May 2012 19:04:40 +0000

For solvents found in Table 4 (Diisopropyl ether) what would best fit for determination of concentration in API?

Comment on Total Volatile Organic Compound (TVOC) Measurement for LEED/Green Building Evaluation by BJ Duerson

BJ Duerson — Tue, 15 May 2012 22:38:31 +0000

Bold to state the 500 ug/m3 limit. I have looked for other guidelines but have only found this number. Yet in many of instances, enough employees have raised a concern thus involking the guideline provided by ANSI/ASHRAE 62.1-2007. Why has there not been a number set? Or at least a number for carcinogenic compounds (ex: formaldahyde)? Thanks for you help!

Comment on GC/MS-Full Scan vs GC/MS-SIM by Miguel

Miguel — Wed, 09 May 2012 19:48:14 +0000

Cual seria la tempoeratura apropiada en la rampla para utilizar el metodo Full Scam????

Comment on New FDA Regulations for Dietary Supplements by Karim

Karim — Mon, 16 Apr 2012 05:02:28 +0000

Hi I am a pharmacy student and i am doing some studies in regards to vitamins and dietary supplements in the United States of America, however i couldnt find informations for the dosage and daily intake from dietary supplements and vitamins approved by the FDA. Could you please update me by email.
Much appreciate your help.

kind regards
Karim

Comment on Heavy Metals (USP) Revisions by Andrew Bierman

Andrew Bierman — Fri, 13 Apr 2012 04:28:09 +0000

Hello,

I am curious what your company charges for a heavy metals screening on 3 supplements. All are the same product, just manufactured by different companies. I’m looking for metals testing profiles for arsenic, mercury, lead, and cadmium. Please provide a quote per test and how much of each product would be needed to complete the test.

Thank you!

Comment on Organochlorine Pesticide Analysis using HRGC/MS/MS by Thomas

Thomas — Sat, 24 Mar 2012 15:13:54 +0000

Can you tell me how you use the lipid removal agent to remove the lipids in your biota extracts? What volume of the LRA do you use per volume of sample and how much lipid does it remove.
Thanks very much,
Gregg

Comment on Cadmium Exposure and Testing by Bryan Sigaran

Bryan Sigaran — Fri, 23 Mar 2012 23:47:59 +0000

can you find the potency and dose of cadmium

Comment on Heavy Metals (USP) Revisions by sebiziga charles

sebiziga charles — Fri, 16 Mar 2012 08:31:17 +0000

give in detail laboratory guideline for chemical analysis of heavy metals from waste water

Comment on USP 467 for Residual Solvents: Manufacturers Face Challenges with Pharmaceutical Impurities by dinesh

dinesh — Wed, 14 Mar 2012 11:39:19 +0000

I am using Acetone in my product the results come to 14000 as a residual solvent please suggest me suitable method to minimize it i am using it for my oral suspension.