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A novel fluorescence method for scre...

Regular, Stephen Kent.

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A novel fluorescence method for screening of polychlorinated biphenyls in soils.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	A novel fluorescence method for screening of polychlorinated biphenyls in soils./
作者:	Regular, Stephen Kent.
面頁冊數:	69 p.
附註:	Adviser: R. Stephen Brown.
Contained By:	Masters Abstracts International39-03.
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MQ55947
ISBN:	0612559475

A novel fluorescence method for screening of polychlorinated biphenyls in soils.
Regular, Stephen Kent.

A novel fluorescence method for screening of polychlorinated biphenyls in soils. - 69 p.

Adviser: R. Stephen Brown.

Thesis (M.Sc.)--Queen's University at Kingston (Canada), 2001.

Polychlorinated biphenyls (PCBs) are persistent organic pollutants that biomagnify through food chains. On-site detection of PCBs in soils is presently performed using an immunoassay technique. The occurrence of false negatives and false positives for some sample types in immunoassay has prompted the examination of fluorescence as a potential means to detect PCBs. While PCBs are not natural fluorophores, exposure of PCBs in methanol to uv light results in dechlorination to lower chlorinated congeners which have been identified as tetrachlorobiphenyl, dichlorobiphenyl and monochlorobiphenyl. The resulting solution gives a fluorescence which is linear with respect to concentration down to 20 ppb for various Aroclor mixtures. This photoactivation procedure requires 20 minutes using a hand-held uv lamp.

ISBN: 0612559475Subjects--Topical Terms:

586156
Chemistry, Analytical.

A novel fluorescence method for screening of polychlorinated biphenyls in soils.
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245 1 0 $a A novel fluorescence method for screening of polychlorinated biphenyls in soils.
300 $a 69 p.
500 $a Adviser: R. Stephen Brown.
500 $a Source: Masters Abstracts International, Volume: 39-03, page: 0851.
502 $a Thesis (M.Sc.)--Queen's University at Kingston (Canada), 2001.
520 $a Polychlorinated biphenyls (PCBs) are persistent organic pollutants that biomagnify through food chains. On-site detection of PCBs in soils is presently performed using an immunoassay technique. The occurrence of false negatives and false positives for some sample types in immunoassay has prompted the examination of fluorescence as a potential means to detect PCBs. While PCBs are not natural fluorophores, exposure of PCBs in methanol to uv light results in dechlorination to lower chlorinated congeners which have been identified as tetrachlorobiphenyl, dichlorobiphenyl and monochlorobiphenyl. The resulting solution gives a fluorescence which is linear with respect to concentration down to 20 ppb for various Aroclor mixtures. This photoactivation procedure requires 20 minutes using a hand-held uv lamp.
520 $a Analysis of several soils has been attempted using simple extraction into methanol. Sample clean up was then attempted using different oxidizers, taking advantage of the resistance to degradation of PCBs due to changes in pH. Nitric acid, sulfuric acid, hydrogen peroxide, and sodium hypochlorite were among the oxidizers tested. (Abstract shortened by UMI.)
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