The measurement and evaluation of certain trace metal concentrations in the nearshore environment of the northwest Gulf of Mexico and Galveston Bay.

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dc.acquisition-srcen_US
dc.call-noTD223.5 T4 D3 1968 GBAYen_US
dc.contract-noen_US
dc.contributor.authorDavis, D.R.en_US
dc.contributor.otheren_US
dc.date.accessioned2010-02-15T17:05:20Z
dc.date.available2010-02-15T17:05:20Z
dc.date.issued1968en_US
dc.degreeen_US
dc.description80 p., Dissertationen_US
dc.description-otheren_US
dc.description.abstractAs a study preliminary to a future long-range program to establish water quality standards, this research was directed towards the determination of manganese, nickel, copper, zinc, and lead in the nearshore environment. A method utilizing filtration, ion exchange, persulfate oxidation and hydrofluoric acid digestion in conjunction with atomic absorption spectroscopy was developed. A total of 66 water and 20 sediment samples from Galveston Bay, the Gulf of Mexico, and the Mississippi River were analyzed. The data indicate that these metals are distributed in at least three definable fractions. They are (1) soluble-reactive (ionic) -- that fraction available for direct uptake by the ion exchange resin without prior alteration of their chemical state, (2) filterable-nonreactive (particulate) -- that fraction retained by a 0.3 micro pore size glass fiber filter, and (3) soluble-non- reactive -- the fraction which penetrates both the filter and the ion exchange resin. The only metals which yielded a consistent soluble-nonreactive fraction were nickle and copper. The method was not effective for soluble- nonreactive manganese and lead. No values were obtained for particulate zinc due to an intense silicon interference encountered in the atomic absorbtion phase of the determinations. In Galveston Bay the ranges of the observed ionic values were: <0.1 to 174 ug/1 manganese, <0.1 to 5.92 ug/1 nickle, <0.1 to 1.00 ug/1 copper, 2.5 to 25 ug/1 zinc, and <0.1 ug/1 lead. The ranges of the particulate values were: 5.04 to 84 ug/1 manganese, <0.1 to 3.74 ug/1 nickle, 0.24 to 5.94 ug/1 copper and 1.62 to 4.80 ug/1 lead. Estimated soluble-nonreactive nickle ranged from 0.88 to about 5.92 ug/1 in Galveston Bay. Lower values were found in the nearshore Gulf of Mexico with similar to higher values obtained in the Mississippi River. From the data obtained it was concluded that the particulate form predominates over the ionic form for all the metals with a significant portion of nickel and copper existing as soluble-nonreactive complexes. This has been attributed to solubilization by organic complex formation (e.g. chelation). The ineffectiveness of the method for soluble-nonreactive manganese and lead was attributed to several factors. The existence of higher oxidation states such as Mn (IV) and particulate Pb(IV) coupled with ion pair formation, hydrolysis, isopolycationic complexes are thought to be responsible for the observed discrepancies. No definite distribution patterns of the forms were established. It was inferred from the data that removal of the metals from suspected input points results from adsorption by suspended organic and inorganic materials (e.g. clay minerals).en_US
dc.description.urihttp://gbic.tamug.edu/request.htmen_US
dc.geo-codeNorthwestern Gulf of Mexicoen_US
dc.geo-codeGalveston Bayen_US
dc.historyen_US
dc.identifier.urihttp://hdl.handle.net/1969.3/21711
dc.latitudeen_US
dc.locationGBIC Collectionen_US
dc.longitudeen_US
dc.notesen_US
dc.placeCollege Station, Texasen_US
dc.publisherTexas A&M University.en_US
dc.relation.ispartofseries391.00en_US
dc.relation.urien_US
dc.scaleen_US
dc.seriesen_US
dc.subjectwater qualityen_US
dc.subjectwater analysisen_US
dc.subjectsediment analysisen_US
dc.subjecttrace metalsen_US
dc.subjectcoastal zoneen_US
dc.subjectabsorption spectroscopyen_US
dc.titleThe measurement and evaluation of certain trace metal concentrations in the nearshore environment of the northwest Gulf of Mexico and Galveston Bay.en_US
dc.typeBooken_US
dc.universityen_US
dc.vol-issueen_US

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