Hydrochemistry of a Tropical harbor: Influence of Industrial and Municipal inputs

Journal of Applied Sciences and Environmental Management

Dayo, Olaji Ebenezer¹  Adejare, Ladigbolu Ismail¹  Kayode, Balogun¹ 

关键词: Pollution;    Hydrochemistry;    Harbour;    Heavy metals;   

DOI  :  

学科分类：环境科学（综合）

来源: University of Port Harcourt * Department of Pure and Industrial Chemistry

【 摘 要 】

In recent times, pollution hazards of coastal waters have increased due to human activitiesincluding sand mining and dredging, industrial effluent discharges, indiscriminate dumping of sewage anddomestic waste, use of detergents and heavy metals. A study was carried out to assess the extent of pollutioncaused by industrial and municipal discharges in the Lagos Harbour. Composite samples were collected monthlyfrom the Harbour at seven locations from June to November, 2009 (covering parts of the rainy and dry seasons)and analyzed for some pollution parameters and trace elements [(Temperature, pH, Conductivity, Turbidity,Salinity, Total Dissolved Solids, Dissolved Oxygen, Alkalinity, Organic matters (BOD, COD), Nutrients (NO3,PO4 and SiO4) and Heavy metals (Cr, Pb, Cd, Cu and Fe)]. Surface water of the Harbour was characterized byfairy constant temperature with a range of ( 25.67 – 28.33MoC), alkaline pH (7.70 – 8.42mg/l), brackish salinity(7.00 – 22.47PSU), BOD5and COD values of (0.80 – 3.33mg/l) and (6.10 – 11.30mg/l) respectively, totaldissolved solids(6.00 – 19.00mg/l), dissolved oxygen content (4.13 – 7.60mg/l) which fell below FEPA limit of10mg/l, alkalinity (8.00 – 15.33mg/l), low Nitrate value (0.08 – 0.12mg/l), moderately high Phosphate (0.57 –1.60mg/l), high Silicate values (1.27 – 9.23mg/l), moderate concentration of heavy metals salts such as Cr (0.03 –0.60mg/l), Pb (0.22 – 0.61mg/l), Cd (nd – 0.02mg/l, Fe (0.67 – 1.41mg/l) and high Cu values (4.53 – 5.55mg/l).Correlation between Salinity and heavy metals measured in this study were negative except Iron. Considering thevalues recorded for the pollution indicators, the harbor appears to be organically polluted. The temporal variabilityin some of these parameters could be attributed to influx of freshwater during the rainy season.

【 授权许可】

Unknown