Chemical Characteristics of Buffer Zone Sediments And Implications on Adjoining Water in Diyawanna Lake
Notice bibliographique
Résumé
Diyawanna Lake is one of the major fresh water body located in the middle of SriJayewardenapura Kotte. Most of surrounding area of the lake consists of marshlands. Duringthe recent past several reclamation and development activities going on around the lake. Inaddition, sediments from surface runoff are finally accumulating in the lake margin (bufferzone). However, there is no any study done on sediment quality and impacts of them onadjoining water, especially in the buffer zone of such a fresh water body. Therefore, main aimof this study is to investigate quality of the sediment accumulated in the buffer zone of thelake and also to study the possible impacts on lake water from the sediments due tobiogeochemical reactions in the zone. Thirty three water samples were collected during dryperiod and samples were analysed for pH, electrical conductivity (EC), oxidation reductionpotential (ORP), salinity, total dissolved solid (TDS), NO3-, PO43-, SO42-, Cl-, alkalinity,hardness, Na, K, Ca, Mg, Cd, Cr, Cu, Fe, Pb, Mn, Zn and Ni. In addition, black organicsediment samples were collected from selected locations and tested for pH, ORP, EC, organiccarbon, total organic matter, NO-3, PO4-3, Na, K, Ca, Mg, Cd, Cr, Cu, Fe, Pb, Mn, Zn and Ni.Average values of pH, EC, ORP, TDS, NO3-, PO43-, SO42-, Cl-, alkalinity, hardness, Na, K,Ca, Mg, Cu, Zn and Fe for the lake water are 7.4, 222 μS/cm, -37 mV, 222 mg/l, 0.11 ppm,15.00 ppm, 1.43 ppm, 20.00 ppm, 0.0002 ppm, 772 ppm, 16 ppm, 10 ppm, 36 ppm, 21 ppm,0.001 ppm, 0.009 ppm and 0.14 ppm respectively. However, element Cd, Pb, Mn and Niwere not detected. Piper classification for the lake water indicate CaSO4 type, which reflecttypical gypsum type of waters with impact of mine drainage due to mineral pyrite in soil.Also, sulfur emitted by the vehicles may react with water to form sulfuric acid. In addition,gypsum type of water may also due to accumulation of building materials such as cement.Therefore reason for the CaSO4 type of water may be due to several sources in the area. Inaddition, compared to WHO guidelines only Cr (0.58 ppm) present in the water isconsiderably high, this may be due to direct discharge of urban dust into the lake.Average values of pH (6.1), ORP (54 mV), EC (122 μS/cm), organic carbon (3.1%), totalorganic matter (18%), nitrate (0.93 ppm), phosphate (12 ppm), Na (3.5 g/kg), K (11 g/kg), Ca(73 mg/kg), Mg (84 mg/kg), Cd (40 mg/kg), Cr (391 mg/kg), Cu (134 mg/kg), Fe (44 g/kg),Pb (833 mg/kg), Mn (157 mg/kg), Ni (196 mg/kg) and Zn (33 g/kg) in the sediments areconsiderably different value than the water. Compare with Canadian Environment Qualityguidelines average values of Cd, Cr, Pb and Zn are higher in the sediments. This is mainlydue to accumulation of those elements from runoff water. In general, it can be concluded thatprevailing physical conditions of the lake water is controlling leaching of heavy metals fromsediments to water. Conversely, anthropogenic sources seem to be increase accumulation ofheavy metals in the buffer zone sediments.Keywords: Diyawanna Lake, Water quality, Sediment quality
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».