Study on some heavy metals in soil, water, sediment and paragrass (Brachiaria mutica) in lower Chao Phraya Basin
1997
Sudchai Kumnermanee
This research was studied on some heavy metals in soil, water, sediment and paragrass in lower Chao Phraya Basin. The study was conducted 3 times in November 1995 - February 1996, March - June 1996 and July - October 1996. The results of study on some heavy metals in water were found as follows : The concentrations were in the descending order of Mn Zn Pb Cu Cd Ni Cr. The mean concentrations of these were 30.00, 15.40, 6.77, 3.81, 1.19, 0.49 and 0.11 ppb, respectively. The concentrations of heavy metals in soil were in the descending order of Mn Zn Pb Cr Cu Ni Cd. The mean concentrations of these were 481.83, 73.58, 23.89, 20.17, 18.69, 18.43 and 0.81 ppm, respectively. The concentrations of heavy metals in sediment were in the descending order of Mn Zn Cu Pb Ni Cr Cd. The mean concentrations of these were 543.20, 113.35, 33.40, 27.62, 20.92, 18.84 and 0.88 ppm, respectively. The concentrations of heavy metals in Paragrass were in the descending order of Mn Pb Zn Ni Cd Cu Cr. The mean concentrations of these were 127.20, 74.98, 44.07, 25.72, 12.20, 5.71 and 0.64 ppm, respectively. In the lower Chao Phraya Basin, the efficiency of paragrass absorption based on the mean concentrations of these heavy metals in soil, the absorption of paragrass were 59.89 percent, 26.40 percent, 30.55 percent, 313.86 percent, 139.56 percent, 1,506.17 percent and 3.17 percent for Zn, Mn, Cu, Pb, Ni, Cd and Cr, respectively. The concentrations of these heavy metals in water in the lower Chao Phraya Basin in this study did not exceed the quality standards for surface water which is not sea water. The mean concentrations of these heavy metals in soil, sediment and paragrass did not exceed the critical concentrations levels.
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