Book chapter
Heavy Metal, Oil and Grease Pollution of Water and Sediments in Estuarine Lagoons in Sri Lanka: A Case Study in Negombo Estuarine Lagoon
Multi-Hazard Early Warning and Disaster Risks, pp.429-442
Springer International Publishing, 1st
12/09/2021
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Abstract
Negombo Lagoon is located in the vicinity of a highly industrial and urbanized area. Thus, analysis of heavy metals, oil and grease in the lagoon is of importance at present. The present study has been carried out to assess the contamination levels of heavy metals (Cd and Pb), oil and grease of water and sediments in the Negombo lagoon. Sampling has been carried out in 8 locations. Atomic Absorption Spectrophotometer and standard method of Microwave Digestion Detection by Atomic Absorption Spectrophotometry were used for the heavy metal and oil analysis. Spatial interpolation technique in Arc GIS was used to analyse the data. The Cadmium ion (Cd++) in Negombo lagoon varied between 2.1 and 4.9 ppb and Lead (Pb++) between 17.6 and 48.6 ppb.The concentration of Cd++ and Pb++ of lagoon water in most locations were close to the upper limit of the inland water standards. High Cd and Pb concentrations were observed in Eastern half of the lagoon. The concentration of oil and grease of the water was between 200 and 5600 µg/l which was extremely high when compared to the minimum quality of the inland water standards. Cd levels of sediments varied between 1002 and 1280 µg/kg while the Pb levels varied between 12,300 and 18,300 µg/kg. Oil and grease concentrations of sediments varied between 30,000 and 3,720,000 µg/kg. Concentration of Cd in sediment when compared to that of water was 477 times higher in its lower limit and 2526.2 times in its upper limit. Likewise, Pb in sediment is was 699 times higher than lower limit and 376 times higher in upper limit. Oil and grease in sediments were 15times and 66.4 times higher than lower limit and upper limit of the water respectively. The probable reasons for the contamination is lead to be the manmade activities linked to unplanned development with less attention on environment concern.
Details
- Title
- Heavy Metal, Oil and Grease Pollution of Water and Sediments in Estuarine Lagoons in Sri Lanka: A Case Study in Negombo Estuarine Lagoon
- Creators
- C. M. KanchanaN. K. ChandrasekaraK. D. N. WeerasingheSumith Pathirana - Southern Cross UniversityRanjana U. K. Piyadasa
- Publication Details
- Multi-Hazard Early Warning and Disaster Risks, pp.429-442
- Publisher
- Springer International Publishing; Cham
- Edition
- 1st
- Identifiers
- 991013055512902368
- Copyright
- © 2021 The Author(s), under exclusive license to Springer Nature Switzerland AG
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Book chapter