Geochemical distribution of trace metal pollutants in water and sediments of downstream of an urban river|
Mohiuddin, K. M.; Zakir, H. M.; Otomo, K.; Sharmin, S. & Shikazono, N.
A study was conducted to investigate the trace metal pollution of water and sediments of downstream
of Tsurumi River, Yokohama, Japan. Twenty samples of water and sediments were collected from the river starting from
Tokyo bay side up to the junction point of the Yagami River. Results show that the mean concentrations of chromium,
cupper and nickel in water greatly exceed (>100 times) the surface water standard. The concentration of molybdenum
and lead was also higher than standard values while iron and manganese was lower than that of surface water standard.
The mean concentration of zinc, cupper, cadmium, lead, chromium, vanadium, bromine and iodine was 381.1, 133.0,
1.0, 40.8, 102.9, 162.0, 71.5 and 10.6 μg/g sediments, respectively and was greatly exceed the average worldwide shale
concentrations and average Japanese river sediment values. However, mean concentration of arsenic, nickel and strontium
was 11.0, 36.6 and 164.6 μg/g sediments, respectively which was lower than the average shale value. Other analyzed
trace metals, including barium, zirconium, rubidium, yttrium, tin, antimony, cesium, lanthanum, cerium, praseodymium
and neodymium were detected in river sediments; the concentration of which was close to the Japan’s river sediment
average values. Pollution load index values of the sites of the studied area ranged from 1.24 to 7.65 which testify that the
river sediments are polluted. The PLI value of the area was, however, high (6.53) as the concentration of trace metals like
zinc, cupper, cadmium, lead and chromium were very high and were the major pollutants.
Enrichment factors; Environmental pollution; Heavy metal; Pollution load index; Tsurumi river; Water quality and River-bed sediments