(4) Enrichment ratio (富集比)：The ratio of the grade of the concentrate to the grade of the feed.
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已发现，与土壤相比，侵蚀 泥沙有较高的养分含量，表现出对氮等养分的富集，这种富集作用可用富集系数（Enrichment Ratio，ER）表示。大多文献把侵蚀泥沙对养分的富集归因于径流对土表富含养分的有机质和粘 粒的选择性搬运。
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已发现，与土壤相比，侵蚀 泥沙有较高的养分含量，表现出对氮等养分的富集，这种富集作用可用富集系数（Enrichment Ratio，ER）表示。大多文献把侵蚀泥沙对养分的富集归因于径流对土表富含养分的有机质和粘 粒的选择性搬运。
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concentration enrichment ratio 浓度富集率
enrichment ratio er 富集系数
enrichment ratio of nutrient 养分富集率
ratio of enrichment 浓缩比 ; 富集比
At the same situation, the higher the metal ion valence was, the larger the removal rate, and the smaller the enrichment ratio.5.
结果表明,在相同条件下,金属离子的价态越高,去除率越高,但富集比较低;价态较低的金属离子具有较高的富集比,但去除效果相对较差。
参考来源 - 泡沫分离法除去水溶液中金属离子的研究the north of Xinjiang;; haloxylon ammodendron;; enrichment ratio;;“fertile island”;;“salinity island”
北疆;;梭梭;;富集率;;“肥岛”;;“盐岛”
参考来源 - 北疆典型荒漠植被梭梭（Haloxylon Ammodendron）“肥岛”特征研究Under these conditions, enrichment ratio of flavonoids was up to 2. 97, while the content was measured to be 19.66% and enrichment rate about 37%.
银杏黄酮富集比可达到2.97，含量达到19.66％，此时收率约为37％。
参考来源 - 泡沫法富集分离银杏叶有效成分工艺研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Furthermore, the paper also gives some advices to operation of saponification glycerol distillation in order to increase recovery ratio of glycerol and enrichment of polyglycerol.
此外，还对皂化甘油蒸馏操作提出了建议，以提高甘油蒸馏得率和聚合甘油的富集。
High coal ratio is a target of ironmaking in future and the role of oxygen enrichment in high coal ratio has been proved in theory and practice.
提高煤比是今后我国炼铁的重要任务。富氧对提高煤比的作用在理论和实践中都得到证实。
The change of blast furnace indices with the oxygen enrichment and PCI were obtained by a mathematical-simulation, which indicates that the replacement ratio will decrease with increasing of PCI rate.
通过数学模型获得了富氧喷煤高炉参数的变化，计算结果表明，随着喷煤量的增加，置换比将会降低。
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