The determination of chrysotile in insulation samples using combined TGA-GCA.
Authors
Scalera JV
Source
Proc North Am Thermal Analysis Soc Conf New Orleans Louisiana Oct 19- 21 Oct; 2(51):303-309
Link
NIOSHTIC No.
10006810
Abstract
The Bureau of Mines particulate mineralogy unit. One of the objectives is to provide technical assistance on mineral particulate- related problems to other federal agencies. Quantification of the asbestos content in insulation and construction materials is necessary for the U.S. Environmental Protection Agency to evaluate the potential health risk from exposure to airborne fiber. Gas chromatographic analysis (GCA) of the effluent gases from a thermogravimetric analysis (TGA) balance can provide quantitative data concerning the composition of insulation samples. The GCA peak related to the dehydration of chrysotile occurs within the temperature range of 560 deg. to 660 deg. C. Using chrysotile standards, a linear relationship is obtained relating the summation of the peak heights for water evolved within this 100 deg. C range and the mass of chrysotile present in the sample. The use of a narrow 100 deg c range to acquire the dehydration data for chrysotile minimizes interferences from hydrates that decompose at lower temperatures and amphiboles that decompose at higher temperatures, for examples, gypsum and amosite. GCA data also allow avoiding misinterpreting tga thermograms for chrysotile when actual caco3 decomposition is involved by resolving weight losses in the dehydration range of chrysotile into components of water and co2.
Publication Date
19811001
Document Type
OP;
Fiscal Year
1982
Identifying No.
OP 52-81
Issue of Publication
51
NIOSH Division
AVRC;
Source Name
Proc. North Am. Thermal Analysis Soc. Conf. New Orleans, Louisiana, Oct. 19- 21,V. 2, No. 51 Pp 303-309
Links with this icon indicate that you are leaving the CDC website.
The Centers for Disease Control and Prevention (CDC) cannot attest to the accuracy of a non-federal website.
Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
You will be subject to the destination website's privacy policy when you follow the link.
CDC is not responsible for Section 508 compliance (accessibility) on other federal or private website.
For more information on CDC's web notification policies, see Website Disclaimers.
CDC.gov Privacy Settings
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.
Thank you for taking the time to confirm your preferences. If you need to go back and make any changes, you can always do so by going to our Privacy Policy page.