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Distribution and Classification of Arsenic in My Country
The arsenic distribution area in my country covers approximately 16,700 square kilometers, primarily concentrated along the banks of the Yellow River, spanning the border regions of Shanxi, Shaanxi, and Mongolia. Based on different surface coverings, the arsenic distribution can be classified into three types:
Bare Arsenic Sandstone Areas
Found in hilly terrains with dense ravines and sparse vegetation.
Arsenic sandstone is exposed not only in valleys but also on slopes.
Soil-Covered Areas
Arsenic sandstones are buried under various loess landforms.
These formations create unique landscapes where:
Loess appears to “wear a hat.”
Arsenic grey sandstone building stones appear to “wear a skirt.”
Sand-Covered Areas
Arsenic sandstone is buried under windblown sand, forming part of dunes.
Thin layers of sand alternate with arsenic grey sandstone building stones.
Comprehensive Evaluation of Arsenic Reservoirs
The evaluation process follows a structured methodology:
Selection of Evaluation Indices
Standardization of indices to ensure accuracy.
Assignment of Weight Coefficients
Each evaluation index is assigned a weight based on its significance.
A comprehensive evaluation coefficient is calculated to classify reservoir types.
Quantitative Assessment
The final step involves a comprehensive quantitative evaluation of the reservoir.
Principles for Establishing an Evaluation Index Set
The selection of indices must adhere to three key principles:
Effectiveness & Sensitivity
Each index should accurately reflect specific characteristics of the system.
Independence & Discreteness
Indices should be uncorrelated or have minimal correlation to ensure distinctiveness.
Comprehensiveness
The index set must cover all essential features of the evaluation plan.
