000			03306nam a2200253 c 4500
003			CHED
005			20250128142246.0
007			ta
008			250128e2018 ph ||||| |||| 00| 0 eng d
040			_cCommission on Higher Education
100	1		_aSantillan, Bertrand Aldous L.
245	0	0	_aCharacterization and heavy metal pollution assessment of sediments from Laguna de Bay, Philippines _c / Bertrand Aldous L. Santillan
260	3		_aLos Baños _b : University of the Philippines _c,2018.
300			_axiv,183 leaves _c27 x21cm.
500			_aThesis (Master of Science in Environmental Science) -- University of the Philippines Los Baños, December 2018.
520	3		_aLaguna de Bay, the largest lake in the Philippines, is threatened by worsening environmental quality due to the negative impacts of urbanization and industrialization. One of the issues pressuring the lake is shallowing due to increased sedimentation. Plans are underway to dredge the sediments to restore the lake. However, little is known about the quality of the lake sediments especially its pollutant concentrations. In this study, sediments in the South Bay wereinvestigated for its geochemical characteristics and heavy metal pollution. Sediment cores from the upper >I m ofthe lakebed were collected from eight locations around the South Bay. The cores were macroscopically analyzed before subsampled at 2.5 cm intervals, dried, analyzed for water content and total organic matter content, sieved up to 63 m and analyzed for grain size anti to 1 heavy metals usingXRF and ICP-OES. Resul s ofthe analyses showed that water content differs between cores, the average total OM is at 11 %, and grain size and total HM differ among core locations and depth. Ten HM ofindustrial significance were assessed using four single indices: EF, Igeo, CF and AF, and four integrated indices: PLI, NPI, mCd, and RI. It was found that Sn and Pb are highly enriched and strongly contaminated, while Sb has moderate enrichment and contamination, the rest are minimal. As is the least enriched and polluted. Ordinary kriging interpolation was used to show the spatial distribution of pollution indices. It was found that the San Cristobal River mouth area is highly polluted, primarily by Sn, while the mid- lake is moderately polluted, primarily by Pb. Potential sources ofSn and Pb were identified by inspecting the industrial activities in the area, as well as other lake dynamics. The ecological risk assessment showed considerable risk in the San Cristobal River mouth and moderate risk in the mid-lake. Decision and policy makers should consider the Sn, Pb, and Sb pollution in the management of sediments and the monitor the discharges of industrial parks to the lake.
650	1	0	_aSediments (Geology) _xEnvironmental aspects _zPhilippines
650	2	0	_aHeavy metals _xEnvironmental aspects _zPhilippines
650	2	0	_aPollution _xEnvironmental aspects _zPhilippines
650	2	0	_aLaguna de Bay (Philippines) _xEnvironmental conditions
856	4	0	_uhttp://181.215.242.151/cgi-bin/koha/opac-retrieve-file.pl?id=016691be4f165787756fe785f997b4f9 _zAbstract
856	4	0	_uhttp://181.215.242.151/cgi-bin/koha/opac-retrieve-file.pl?id=809ef1d2778b945c61b1d3f419540998 _zTable of Contents
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999			_c7341 _d7341