| dc.contributor.author | Bottaro, Christina Sheila. | en_US |
| dc.date.accessioned | 2014-10-21T12:33:29Z | |
| dc.date.available | 1999 | |
| dc.date.issued | 1999 | en_US |
| dc.identifier.other | AAINQ49246 | en_US |
| dc.identifier.uri | http://hdl.handle.net/10222/55624 | |
| dc.description | Extractable organohalogens (EOX) are organic compounds that have halogen substituents and can be extracted from a sample using any one of a variety of extraction techniques. Some components of EOX, especially extractable organochlorine (EOCl) have known toxic effects, and have been a source of concern for many years. The literature suggests that up to 95% of the chlorine in EOCl cannot be accounted for as known organochlorine (OCl) compounds. The objective of this thesis has been to study extractable organohalogens in the Northern Pink Shrimp Pandalus borealis. | en_US |
| dc.description | One of the primary aims has been to evaluate various methods for the extraction of EOX from shrimp. This work has indicated that of the solvent systems studied, a mixture of acetone and hexane (1:1) gave the highest relative extraction efficiency for lipid. Other factors investigated included: extractability of EOX using different apparatus, efficiency of washing to remove salt, drying, solvent evaporation, and degradation due to storage. A neutron activation analysis (NAA) method has been developed for the determination of total EOX with detection limits of 32, 2.0 and 0.68 ng mL--1 for Cl, Br and I, respectively. A quality assurance program was also applied to the work to ensure that results were reliable. | en_US |
| dc.description | Shrimp muscle and roe from several areas in the North Atlantic were analyzed for EOX. The EOX levels in shrimp roe from the Coast of Labrador showed an increasing trend from North to South. There was also a strong correlation between the levels of extractable organobromine (EOBr) and extractable organoiodine (EOI) in muscle and roe. This high correlation was not evident for EOCl and EOBr or EOI. | en_US |
| dc.description | Studies were conducted to characterize EOX. Size exclusion chromatography on extracts from shrimp muscle and roe showed that the distributions of EOX were highly correlated to that of lipid. A strong relationship was found between the distributions of EOBr in different roe extracts and also for EOI in extracts of muscle and roe. Both NMR and MS were used to characterize roe extracts containing high levels of EOCl. The results revealed that the extracts were primarily composed of acylglycerols and fatty acids. The primary chlorinated compound is believed to be a mono-unsaturated fatty acid with a double bond at the n-2 position and a terminal chlorine. | en_US |
| dc.description | Thesis (Ph.D.)--Dalhousie University (Canada), 1999. | en_US |
| dc.language | eng | en_US |
| dc.publisher | Dalhousie University | en_US |
| dc.publisher | | en_US |
| dc.subject | Chemistry, Analytical. | en_US |
| dc.subject | Chemistry, Organic. | en_US |
| dc.title | Studies of extractable organohalogens in northern pink shrimp, Pandalus borealis. | en_US |
| dc.type | text | en_US |
| dc.contributor.degree | Ph.D. | en_US |
