Oil and grease concentration in water and surface sediment from FSSA Lake

• Main Author: Norliyana Jeinia
• Format: Academic Exercise
• Language: English
• Published: 2014
• Subjects: QD Chemistry
• Online Access: https://eprints.ums.edu.my/id/eprint/17659/1/Oil%20And%20Grease%20Concentration%20In%20Water%20And%20Surface%20Sediment%20From%20Fssa%20Lake.pdf; https://eprints.ums.edu.my/id/eprint/17659/

This study was carried out to determine the concentration of oil and grease (OG) in water and surface sediment of FSSA lake, UMS. The concentration of OG in water and surface sediment was also compared. Sampling was done twice and six sampling stations were chosen. The samples were taken from the water (taken from 2.0 to 3.0 cm from surface water) and surface sediment (depth of 0.04 m to 2.89 m) according to each sampling station. Each sample of water and sediment has been replicated 3 times to obtain more accurate reading. The concentration of OG in water and sediment were analyzed at the laboratory by using liquid-liquid extraction method with the solvent of petroleum ether for water samples and method of soxhlett extraction for sediment samples. The OG concentration in water were found to be lowest at Station 1 with the mean of 0.0019 ± 0.0002 mg/L for the first sampling and 0.0021 ± 0.0002 mg/L for second sampling respectively. Meanwhile, the highest concentration of OG in water were found at Station 6 which gives the mean value of 0.0067 ± 0.0006 mg/L in the first sampling and 0.0071 ± 0.0002 mg/L in second sampling. Since there is a strongly linear correlation (r = 0.996 for first sampling and r=0.989 for second sampling) with significant-p < 0.05 between the concentration of OG in water and the OG concentration in sediment, thus the concentration of OG in surface sediment will be affected by the concentration of OG in water. An Increase in the OG concentration in water will increases the OG concentration in sediment. According to the National Water Quality Standards (NWQS) and the Provincial Sediment Quality Guideline (PSQG), the OG concentration in water and surface sediment at all stations from FSSA lake were not exceeded the standard limit that is below 1.5 mg/L. Overall, the results of this study indicated that there is no serious OG pollution in water and sediment of FSSA lake and also still considered as safe and clean.