Studies show that surface sediments of the flood land seem to be the best sampling media in ultra-low density geochemical investigation in forest-swamp areas.
研究成果表明，河漫滩表层沉积物是森林超低密度地球化学调查的最佳采样介质。
2
This method is rapid, cheap, effective and non-pollution and is a new technology of surfacegeochemical exploration.
该方法有快速、廉价、有效、无污染等特点，是地表地球化学勘探的一种新方法。
3
This makes geochemical prospecting turn from the study of seeping "trace" and halo anomalies of hydrocarbons in near surface to a direct research and prediction of the target distribution.