[A study about the interrelation between the pH values of solid wastes and extracting solvents].
A preliminary study about the interrelation between the pH values of solid wastes and extracting solvents has been conducted. The result showed that the amount of trace metals dissolved was significantly different when the solid waste samples with different pH values were extracted by extracting solventsin different pH values. The amount of trace metals was great for acidic waste samples in the low pH(pH 2-4) extracting solvents. When the pH values of the extracting solvents were at pH 4-8, the amount of heavy metals dissolved reached their end points. For neutral solid wastes, the amount of dissolved metals were not largely effected by the pH values of the extracting solvents. For basic solid waste, there were not noticeable amount of metals were dissolved in the extracting solvents with different pH values. Moreover, the compounds's formation of the metals in the samples had a direct effect on the amount of metals dissolved. This study suggested that it could be very environmentally harmful when improperly stored or buried solid wastes were washed or immersed in acid rains. The article also suggested that regional environmental testing standards should be established based on the pH value of the precipitation in the area.
Lu
Ying
Y
Hangzhou Environmental Monitoring Center, Hangzhou 310007, China.
Wang
Zhi-wei
ZW
D000327:Adsorption; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000517:prevention & control*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D019216:Metals, Heavy / Q000737:chemistry*; D012997:Solvents; D013054:Spectrophotometry, Atomic; D018505:Waste Management / Q000379:methods
D007220:Industrial Waste; D019216:Metals, Heavy; D012997:Solvents