| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 102 === Many heavy metals contaminated sites were found in Taiwan in these recent years. Our water and soil system were contaminated by some illegal industrial wastes dumping. Therefore, it is necessary to clarify the responsibilities of waste and soil pollution. We established a method refer to the general soil inspection items such as pH, EC, color, odor, exchangeable cations, CEC, heavy metals and XRD to identify the different between waste and soil.
In this study, nearby soils (mud and farmland) of a southern Taiwan heavy metals contaminated site were collected as background. The background soils are olive gray silt loam and without odor. They were weakly alkaline and alkaline, and the conductivities were less than 8mS/cm. If 3 of the unknown sample’s physical characteristics (pH, EC, color and odor) are different from background soil, the score > 8 was classified as “suspected non-local soil or unknown substance”. If score < 8, it was classified as “suspected local soil”.
Sample's chemical characteristics (metals’ solubility, total Cl, Cl- and total metals) were the secondary basis of identification. If sample’s physical and chemical integrated score > 64 was classified as “suspected waste”. The score between 32 and 64 was classified as “non-local soil”. And the score < 32 was classified as “local soil”.
Finally, if quartz or other clay minerals were identified by XRD, sample was classified as “contaminated soil”. Otherwise, samples are classified as “waste”. In this study “local soil” were quiet similar to the background soils, reconfirmed by XRD was not necessary. However, extra XRD confirmations were also verified.
Physical and chemical identification can success classify 70 to 80% sample into “waste” and “soil” in this study. Without XRD samples can be classified as “suspected non-local soil” or “unknown substance and suspected waste” only. Unknown sample reconfirmed by XRD may improve the correctness.
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