عنوان المقالة:تطبيق الطريقة الجيوإحصائية للاستقراء المكاني الداخلي في تقييم الخطورة الجيوكيميائية المتخلفة في تربة أراضي المناجم المهجورة في وادي أولو جوهان Geostatistical Spatial Interpolation Applied to Soil Geochemical Hazard Assessment of Abandoned Mining Lands in Ulu Johan
Kinta Valley, West Malaysia is a mineralized district with a long
history of metal mining. The mine soil of the abandoned land is laden with
various species of hazardous chemicals that pose continued risk to human
health and the environment. The residual hazard in the soil needs to be
analyzed and managed before initiating development projects in the area. Geostatistics provide risk analysts with various techniques specialized for analyzing stochastic phenomena, such as pollution. In this paper, the residual geochemical hazard of soil arsenic and lead in the post-mining area of Ulu Johan, Kinta Valley was analyzed for human health and ecological receptors. A geochemical exploration procedure was undertaken to collect, prepare and analyze 25 soil samples extracted at average depth <40 cm by random sampling. The geochemical signature of each sampling location was used to establish the geotoxicity index that, in turn, formed an input information for estimating and interpolating the spatial distribution of hazard throughout the study area. The data was processed and thematically visualized in GIS environment. The results indicated that the most hazardous locations of exposure probability exceeding 50% are widely distributed along the northeast-southwest direction, parallel to mining activities. In these locations, soil imposes high risk to human and ecological receptors (hot spots), and therefore they should be scheduled for rehabilitation to manage the contamination risk to an acceptable level before re-developing the land asset.
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