The Malaysian Journal Of Analytical
Sciences Vol 14 No 1 (2010): 24 – 31
Effects of Induced Salinity on BOD5
Reaction Kinetics of
River Water Samples
(Kesan
Peningkatan Kemasinan Terhadap Kinetik Tindak Balas Keperluan Oksigen Biokimia
5
Hari Menggunakan Sampel Air Sungai)
Zaki
Zainudin1*, Maketab Mohamed2, Mohd. Rosslim Ramli3
1Water Resources Technical Division,
Institution of Engineers Malaysia, 46720 Petaling Jaya, Selangor Darul Ehsan
2Faculty of Chemical and Natural
Resources Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor,
Malaysia
3Faculty of Chemical Engineering,
Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia
*Corresponding author: zakizainudin@gmail.com
Abstract
Biochemical
Oxygen Demand (BOD) is a typical parameter
used in assessing organic pollution strength in surface waters and is normally
tested over a 5-day period at an incubation temperature of 20°C (BOD5).
The accuracy of this constituent, in assessing organic contamination under
brackish conditions has always been known to be somewhat limited as elevated
concentrations of chloride (Cl-) disrupts microbial activity from
osmotic cellular degradation, causing the bottle decay rate, k1, to
be effected. The aim of this study was to quantify the effects of induced
salinity on k1, with varying levels of sodium chloride (NaCl)
concentration (5 – 25 ppt), towards six mildly polluted to polluted tropical
river water samples. The observed variations ranged between 0.10 – 0.25/day of
k1 for the stipulated samples using the Thomas graphical method for
determination of the k1 rate constant. Sg. Rawang depicted the
highest quantum of difference in k1, with decrement from 0.754/day
(0 ppt) to 0.513/day (25 ppt), whereas Sg. Klang showed the lowest quantum,
from 0.306/day (0 ppt) to 0.265/day (25 ppt).
Keywords
: BOD5
saline, brackish, estuarine, bottle decay rate
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