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用5％的次氯酸纳从地表沉积物中萃取有机结合金是可行的。对于有机质含量高的湖泊和河流沉积,从有机相中金的回收率接近于定量分析。对于有机质含量低的河流沉积和土壤,由于释放的金被样品的无机组分吸附使金的回收复杂化。对于这些物质有机结合金的回收率低于70％是可能的。对含金53.4ppb的河流沉积物取10克样品时,此方法的精确度约为6％。当用5克河流沉积物样品时约为14％。所有试验获得的结果表明,沉积物和土壤中的金多以有机结合金的形式存在。
It is feasible to extract organically bound gold from surface sediments using 5% sodium hypochlorite. For lake and river sediments with high organic matter, gold recovery from the organic phase is close to quantitative analysis. For river sediments and soils with low organic matter content, gold recovery is complicated by the release of gold by adsorption of the inorganic components of the sample. It is possible to recover less than 70% of organically bound gold for these materials. The accuracy of this method is about 6% for a 10 g sample of 53.4 ppb river sediment. About 14% when using 5 grams of river sediment sample. The results obtained from all experiments show that gold in sediments and soils mostly exists in the form of organically bound gold.